diff --git a/.flake8 b/.flake8
index 4f16d6847..19e89069e 100644
--- a/.flake8
+++ b/.flake8
@@ -2,3 +2,6 @@
 
 # Match the maximum line length in Swift files.
 max-line-length = 120
+
+# E265, E266 and conflict with the header expected by the license header check
+ignore = E265, E266
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 87e2293aa..eee08dadf 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -12,6 +12,5 @@ jobs:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
     with:
-      license_header_check_enabled: false
       license_header_check_project_name: "Swift.org"
       api_breakage_check_allowlist_path: "api-breakages.txt"
diff --git a/.license_header_template b/.license_header_template
new file mode 100644
index 000000000..309ac5afe
--- /dev/null
+++ b/.license_header_template
@@ -0,0 +1,11 @@
+@@===----------------------------------------------------------------------===@@
+@@
+@@ This source file is part of the Swift.org open source project
+@@
+@@ Copyright (c) YEARS Apple Inc. and the Swift project authors
+@@ Licensed under Apache License v2.0 with Runtime Library Exception
+@@
+@@ See https://swift.org/LICENSE.txt for license information
+@@ See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+@@
+@@===----------------------------------------------------------------------===@@
diff --git a/.licenseignore b/.licenseignore
new file mode 100644
index 000000000..96639483f
--- /dev/null
+++ b/.licenseignore
@@ -0,0 +1,11 @@
+.flake8
+.gitignore
+.swiftci
+*.md
+*.txt
+*.yaml
+*.yml
+**/*.docc/**
+**/*.modulemap
+CODEOWNERS
+Package.swift
diff --git a/Plugins/FormatPlugin/plugin.swift b/Plugins/FormatPlugin/plugin.swift
index 66bf3b74e..74dbb0393 100644
--- a/Plugins/FormatPlugin/plugin.swift
+++ b/Plugins/FormatPlugin/plugin.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import Foundation
 import PackagePlugin
 
diff --git a/Plugins/LintPlugin/plugin.swift b/Plugins/LintPlugin/plugin.swift
index bb59c34a1..5749bf131 100644
--- a/Plugins/LintPlugin/plugin.swift
+++ b/Plugins/LintPlugin/plugin.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import Foundation
 import PackagePlugin
 
diff --git a/Scripts/format-diff.sh b/Scripts/format-diff.sh
index 4ee7edd1b..0254fbe33 100755
--- a/Scripts/format-diff.sh
+++ b/Scripts/format-diff.sh
@@ -1,15 +1,15 @@
-#!/usr/bin/env bash
-#===----------------------------------------------------------------------===#
-#
-# This source file is part of the Swift.org open source project
-#
-# Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
-# Licensed under Apache License v2.0 with Runtime Library Exception
-#
-# See https://swift.org/LICENSE.txt for license information
-# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
-#
-#===----------------------------------------------------------------------===#
+#!/bin/bash
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift.org open source project
+##
+## Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See https://swift.org/LICENSE.txt for license information
+## See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+##
+##===----------------------------------------------------------------------===##
 
 # SYNOPSIS
 #   format-diff.sh FILE [OPTION]...
diff --git a/Sources/_SwiftFormatTestSupport/DiagnosingTestCase.swift b/Sources/_SwiftFormatTestSupport/DiagnosingTestCase.swift
index cb4e07267..1c5c78ae8 100644
--- a/Sources/_SwiftFormatTestSupport/DiagnosingTestCase.swift
+++ b/Sources/_SwiftFormatTestSupport/DiagnosingTestCase.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 @_spi(Rules) @_spi(Testing) import SwiftFormat
 import SwiftSyntax
diff --git a/Tests/SwiftFormatPerformanceTests/WhitespaceLinterPerformanceTests.swift b/Tests/SwiftFormatPerformanceTests/WhitespaceLinterPerformanceTests.swift
index b7c8b2110..dc8c92877 100644
--- a/Tests/SwiftFormatPerformanceTests/WhitespaceLinterPerformanceTests.swift
+++ b/Tests/SwiftFormatPerformanceTests/WhitespaceLinterPerformanceTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Testing) import SwiftFormat
 import SwiftParser
 import SwiftSyntax
diff --git a/Tests/SwiftFormatTests/API/ConfigurationTests.swift b/Tests/SwiftFormatTests/API/ConfigurationTests.swift
index 86a9d8dd2..8fd982f5d 100644
--- a/Tests/SwiftFormatTests/API/ConfigurationTests.swift
+++ b/Tests/SwiftFormatTests/API/ConfigurationTests.swift
@@ -1,3 +1,14 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
 import SwiftFormat
 import XCTest
 
diff --git a/Tests/SwiftFormatTests/Core/DocumentationCommentTests.swift b/Tests/SwiftFormatTests/Core/DocumentationCommentTests.swift
index 55af641ef..78b8681b4 100644
--- a/Tests/SwiftFormatTests/Core/DocumentationCommentTests.swift
+++ b/Tests/SwiftFormatTests/Core/DocumentationCommentTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import Markdown
 @_spi(Testing) import SwiftFormat
 import SwiftSyntax
diff --git a/Tests/SwiftFormatTests/Core/DocumentationCommentTextTests.swift b/Tests/SwiftFormatTests/Core/DocumentationCommentTextTests.swift
index a7a16e70d..8d1d2e0d7 100644
--- a/Tests/SwiftFormatTests/Core/DocumentationCommentTextTests.swift
+++ b/Tests/SwiftFormatTests/Core/DocumentationCommentTextTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Testing) import SwiftFormat
 import SwiftSyntax
 import SwiftSyntaxBuilder
diff --git a/Tests/SwiftFormatTests/Core/RuleMaskTests.swift b/Tests/SwiftFormatTests/Core/RuleMaskTests.swift
index 4e46ac635..dea782d9c 100644
--- a/Tests/SwiftFormatTests/Core/RuleMaskTests.swift
+++ b/Tests/SwiftFormatTests/Core/RuleMaskTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Testing) import SwiftFormat
 import SwiftParser
 import SwiftSyntax
diff --git a/Tests/SwiftFormatTests/PrettyPrint/AccessorTests.swift b/Tests/SwiftFormatTests/PrettyPrint/AccessorTests.swift
index 44fe27e9e..b102c583a 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/AccessorTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/AccessorTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class AccessorTests: PrettyPrintTestCase {
   func testBasicAccessors() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ArrayDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ArrayDeclTests.swift
index 389ce0853..6addaa0e7 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ArrayDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ArrayDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 import SwiftSyntax
 import _SwiftFormatTestSupport
diff --git a/Tests/SwiftFormatTests/PrettyPrint/AsExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/AsExprTests.swift
index e59df3422..43e44ce86 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/AsExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/AsExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import XCTest
 
 final class AsExprTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/AssignmentExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/AssignmentExprTests.swift
index 2ab1b1d92..f6a8604ac 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/AssignmentExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/AssignmentExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class AssignmentExprTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/AttributeTests.swift b/Tests/SwiftFormatTests/PrettyPrint/AttributeTests.swift
index 3776b10f7..4419d6f05 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/AttributeTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/AttributeTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class AttributeTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/AvailabilityConditionTests.swift b/Tests/SwiftFormatTests/PrettyPrint/AvailabilityConditionTests.swift
index 080eaee8f..d17268a83 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/AvailabilityConditionTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/AvailabilityConditionTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class AvailabilityConditionTests: PrettyPrintTestCase {
   func testAvailabilityCondition() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/AwaitExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/AwaitExprTests.swift
index 1c890e42d..bb95befb4 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/AwaitExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/AwaitExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class AwaitExprTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/BackDeployAttributeTests.swift b/Tests/SwiftFormatTests/PrettyPrint/BackDeployAttributeTests.swift
index 5deef12bf..ea6ba7c96 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/BackDeployAttributeTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/BackDeployAttributeTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class BackDeployAttributeTests: PrettyPrintTestCase {
   func testSpacingAndWrapping() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/BacktickTests.swift b/Tests/SwiftFormatTests/PrettyPrint/BacktickTests.swift
index 87bb5cc9c..9ca941700 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/BacktickTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/BacktickTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class BacktickTests: PrettyPrintTestCase {
   func testBackticks() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/BinaryOperatorExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/BinaryOperatorExprTests.swift
index 1d2bd6492..9fac440ba 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/BinaryOperatorExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/BinaryOperatorExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class BinaryOperatorExprTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ClassDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ClassDeclTests.swift
index 985d4db66..deac2b9e2 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ClassDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ClassDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class ClassDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ClosureExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ClosureExprTests.swift
index eb437c253..76a453c31 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ClosureExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ClosureExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class ClosureExprTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/CommaTests.swift b/Tests/SwiftFormatTests/PrettyPrint/CommaTests.swift
index c3c7766e5..fb817884a 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/CommaTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/CommaTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class CommaTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/CommentTests.swift b/Tests/SwiftFormatTests/PrettyPrint/CommentTests.swift
index b32342748..8d843a4c5 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/CommentTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/CommentTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ConstrainedSugarTypeTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ConstrainedSugarTypeTests.swift
index 6e79d2805..ace63a044 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ConstrainedSugarTypeTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ConstrainedSugarTypeTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class ConstrainedSugarTypeTests: PrettyPrintTestCase {
   func testSomeTypes() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ConsumeExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ConsumeExprTests.swift
index dfe64d414..aa55e6a45 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ConsumeExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ConsumeExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class ConsumeExprTests: PrettyPrintTestCase {
   func testConsume() {
     assertPrettyPrintEqual(
diff --git a/Tests/SwiftFormatTests/PrettyPrint/CopyExprSyntax.swift b/Tests/SwiftFormatTests/PrettyPrint/CopyExprSyntax.swift
index 5b6a65e95..09973dc9a 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/CopyExprSyntax.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/CopyExprSyntax.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class CopyExprTests: PrettyPrintTestCase {
   func testCopy() {
     assertPrettyPrintEqual(
diff --git a/Tests/SwiftFormatTests/PrettyPrint/DeclNameArgumentTests.swift b/Tests/SwiftFormatTests/PrettyPrint/DeclNameArgumentTests.swift
index 0d02ae3a5..37d005e8b 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/DeclNameArgumentTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/DeclNameArgumentTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class DeclNameArgumentTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/DeinitializerDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/DeinitializerDeclTests.swift
index 4c219eb6b..a91e785c2 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/DeinitializerDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/DeinitializerDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class DeinitializerDeclTests: PrettyPrintTestCase {
   func testBasicDeinitializerDeclarations() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/DictionaryDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/DictionaryDeclTests.swift
index f903b9018..8c7911b58 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/DictionaryDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/DictionaryDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 import SwiftSyntax
 import _SwiftFormatTestSupport
diff --git a/Tests/SwiftFormatTests/PrettyPrint/DifferentiationAttributeTests.swift b/Tests/SwiftFormatTests/PrettyPrint/DifferentiationAttributeTests.swift
index 3c14742f9..f2f500470 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/DifferentiationAttributeTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/DifferentiationAttributeTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class DifferentiationAttributeTests: PrettyPrintTestCase {
   func testDifferentiable() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/DiscardStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/DiscardStmtTests.swift
index 172f04ea4..c437b5e6d 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/DiscardStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/DiscardStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class DiscardStmtTests: PrettyPrintTestCase {
   func testDiscard() {
     assertPrettyPrintEqual(
diff --git a/Tests/SwiftFormatTests/PrettyPrint/DoStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/DoStmtTests.swift
index 2bda1fc27..46b775f5a 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/DoStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/DoStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class DoStmtTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/EnumDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/EnumDeclTests.swift
index d51fbeae4..81e764626 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/EnumDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/EnumDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class EnumDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ExtensionDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ExtensionDeclTests.swift
index d9b2bbe62..1f27a4a82 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ExtensionDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ExtensionDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class ExtensionDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ForInStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ForInStmtTests.swift
index 0349f0b6f..bdcbf760d 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ForInStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ForInStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class ForInStmtTests: PrettyPrintTestCase {
   func testBasicForLoop() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/FunctionCallTests.swift b/Tests/SwiftFormatTests/PrettyPrint/FunctionCallTests.swift
index 7f2d10e7e..837031317 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/FunctionCallTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/FunctionCallTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class FunctionCallTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/FunctionDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/FunctionDeclTests.swift
index 743f11dca..08935ab19 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/FunctionDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/FunctionDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class FunctionDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/FunctionTypeTests.swift b/Tests/SwiftFormatTests/PrettyPrint/FunctionTypeTests.swift
index 8ee6370ee..7f1a7edc5 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/FunctionTypeTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/FunctionTypeTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class FunctionTypeTests: PrettyPrintTestCase {
   func testFunctionType() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/GarbageTextTests.swift b/Tests/SwiftFormatTests/PrettyPrint/GarbageTextTests.swift
index e8f45d91c..fd2f34006 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/GarbageTextTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/GarbageTextTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 fileprivate let bom: Unicode.Scalar = "\u{feff}"
 fileprivate let unknownScalar: Unicode.Scalar = "\u{fffe}"
 
diff --git a/Tests/SwiftFormatTests/PrettyPrint/GuardStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/GuardStmtTests.swift
index 3ec040e06..1ecd70eec 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/GuardStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/GuardStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class GuardStmtTests: PrettyPrintTestCase {
   func testGuardStatement() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/IfConfigTests.swift b/Tests/SwiftFormatTests/PrettyPrint/IfConfigTests.swift
index 1b725a94b..1524297bb 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/IfConfigTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/IfConfigTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class IfConfigTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/IfStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/IfStmtTests.swift
index cddaad53c..4d2685d0b 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/IfStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/IfStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 import XCTest
 
diff --git a/Tests/SwiftFormatTests/PrettyPrint/IgnoreNodeTests.swift b/Tests/SwiftFormatTests/PrettyPrint/IgnoreNodeTests.swift
index 46fa3f467..df5c1f80f 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/IgnoreNodeTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/IgnoreNodeTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class IgnoreNodeTests: PrettyPrintTestCase {
   func testIgnoreCodeBlockListItems() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ImportTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ImportTests.swift
index 326f36718..397d7228f 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ImportTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ImportTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class ImportTests: PrettyPrintTestCase {
   func testImports() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/IndentBlankLinesTests.swift b/Tests/SwiftFormatTests/PrettyPrint/IndentBlankLinesTests.swift
index 31f8a1190..0819c2613 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/IndentBlankLinesTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/IndentBlankLinesTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class IndentBlankLinesTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/InitializerDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/InitializerDeclTests.swift
index 6c15ff53f..4f0edcf91 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/InitializerDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/InitializerDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class InitializerDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/KeyPathExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/KeyPathExprTests.swift
index 8573d4be2..a6ac4681b 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/KeyPathExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/KeyPathExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class KeyPathExprTests: PrettyPrintTestCase {
   func testSimple() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/LineNumbersTests.swift b/Tests/SwiftFormatTests/PrettyPrint/LineNumbersTests.swift
index c377e7cad..924d45513 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/LineNumbersTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/LineNumbersTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/PrettyPrint/MacroCallTests.swift b/Tests/SwiftFormatTests/PrettyPrint/MacroCallTests.swift
index 0da0718ce..d0c761ec4 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/MacroCallTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/MacroCallTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class MacroCallTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/MacroDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/MacroDeclTests.swift
index 2182b9dc4..918e337e5 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/MacroDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/MacroDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class MacroDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/MemberAccessExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/MemberAccessExprTests.swift
index 8ab588c04..a8f31746f 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/MemberAccessExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/MemberAccessExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class MemberAccessExprTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/MemberTypeIdentifierTests.swift b/Tests/SwiftFormatTests/PrettyPrint/MemberTypeIdentifierTests.swift
index da606bab1..461c25707 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/MemberTypeIdentifierTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/MemberTypeIdentifierTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class MemberTypeIdentifierTests: PrettyPrintTestCase {
   func testMemberTypes() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/NewlineTests.swift b/Tests/SwiftFormatTests/PrettyPrint/NewlineTests.swift
index 03f9f0090..cb668e693 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/NewlineTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/NewlineTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class NewlineTests: PrettyPrintTestCase {
   func testLeadingNewlines() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ObjectLiteralExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ObjectLiteralExprTests.swift
index c735320b4..499a79d21 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ObjectLiteralExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ObjectLiteralExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class ObjectLiteralExprTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/OperatorDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/OperatorDeclTests.swift
index 6849fbed2..63411c4f5 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/OperatorDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/OperatorDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class OperatorDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ParameterPackTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ParameterPackTests.swift
index 0e666e041..7fe917cc1 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ParameterPackTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ParameterPackTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class ParameterPackTests: PrettyPrintTestCase {
   func testGenericPackArgument() {
     assertPrettyPrintEqual(
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ParenthesizedExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ParenthesizedExprTests.swift
index f08979ab9..a00eea1f4 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ParenthesizedExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ParenthesizedExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class ParenthesizedExprTests: PrettyPrintTestCase {
   func testSequenceExprParens() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/PatternBindingTests.swift b/Tests/SwiftFormatTests/PrettyPrint/PatternBindingTests.swift
index 608825b96..bc9a7a372 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/PatternBindingTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/PatternBindingTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class PatternBindingTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/PrettyPrintTestCase.swift b/Tests/SwiftFormatTests/PrettyPrint/PrettyPrintTestCase.swift
index 375e5fd7e..eda24f531 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/PrettyPrintTestCase.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/PrettyPrintTestCase.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 @_spi(Rules) @_spi(Testing) import SwiftFormat
 import SwiftOperators
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ProtocolDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ProtocolDeclTests.swift
index 2bad29363..9be89469c 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ProtocolDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ProtocolDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class ProtocolDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/RepeatStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/RepeatStmtTests.swift
index 037c26f31..944eb6410 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/RepeatStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/RepeatStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class RepeatStmtTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/RespectsExistingLineBreaksTests.swift b/Tests/SwiftFormatTests/PrettyPrint/RespectsExistingLineBreaksTests.swift
index fadbc59fe..09260a679 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/RespectsExistingLineBreaksTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/RespectsExistingLineBreaksTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 /// Basic checks and regression tests for the `respectsExistingLineBreaks` configuration setting
diff --git a/Tests/SwiftFormatTests/PrettyPrint/SelectionTests.swift b/Tests/SwiftFormatTests/PrettyPrint/SelectionTests.swift
index fb95b2a6e..19000ca3d 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/SelectionTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/SelectionTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 import XCTest
 
diff --git a/Tests/SwiftFormatTests/PrettyPrint/SemicolonTests.swift b/Tests/SwiftFormatTests/PrettyPrint/SemicolonTests.swift
index 68f0420f8..e7c43a5cf 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/SemicolonTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/SemicolonTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class SemiColonTypeTests: PrettyPrintTestCase {
   func testSemicolon() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/StringTests.swift b/Tests/SwiftFormatTests/PrettyPrint/StringTests.swift
index d97d3e0a0..2a785bdb9 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/StringTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/StringTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) @_spi(Testing) import SwiftFormat
 
 final class StringTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/StructDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/StructDeclTests.swift
index b05e203df..7d3526226 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/StructDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/StructDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class StructDeclTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/SubscriptDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/SubscriptDeclTests.swift
index f7dae1118..2f3d75a60 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/SubscriptDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/SubscriptDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class SubscriptDeclTests: PrettyPrintTestCase {
@@ -13,7 +25,7 @@ final class SubscriptDeclTests: PrettyPrintTestCase {
         }
         subscript(index: Int) -> Int {
           get { return self.value[index] }
-          set(newValue) { self.value[index] = newValue } 
+          set(newValue) { self.value[index] = newValue }
         }
       }
       """
diff --git a/Tests/SwiftFormatTests/PrettyPrint/SubscriptExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/SubscriptExprTests.swift
index fe9bc36cf..118be4718 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/SubscriptExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/SubscriptExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class SubscriptExprTests: PrettyPrintTestCase {
   func testBasicSubscriptGetters() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/SwitchCaseIndentConfigTests.swift b/Tests/SwiftFormatTests/PrettyPrint/SwitchCaseIndentConfigTests.swift
index b39e36e54..02b52d008 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/SwitchCaseIndentConfigTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/SwitchCaseIndentConfigTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 /// Tests the `indentSwitchCaseLabels` config option
diff --git a/Tests/SwiftFormatTests/PrettyPrint/SwitchStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/SwitchStmtTests.swift
index 4c02f4a3f..0aa25e122 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/SwitchStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/SwitchStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class SwitchStmtTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/TernaryExprTests.swift b/Tests/SwiftFormatTests/PrettyPrint/TernaryExprTests.swift
index 6254a50c6..086367af9 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/TernaryExprTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/TernaryExprTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class TernaryExprTests: PrettyPrintTestCase {
   func testTernaryExprs() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/TryCatchTests.swift b/Tests/SwiftFormatTests/PrettyPrint/TryCatchTests.swift
index b92a03338..71073e233 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/TryCatchTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/TryCatchTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 
 final class TryCatchTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/TupleDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/TupleDeclTests.swift
index 91032b5e2..bf12514cb 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/TupleDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/TupleDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class TupleDeclTests: PrettyPrintTestCase {
   func testBasicTuples() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/TypeAliasTests.swift b/Tests/SwiftFormatTests/PrettyPrint/TypeAliasTests.swift
index 45de858e6..2df497d58 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/TypeAliasTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/TypeAliasTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class TypeAliasTests: PrettyPrintTestCase {
   func testTypealias() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/ValueGenericsTests.swift b/Tests/SwiftFormatTests/PrettyPrint/ValueGenericsTests.swift
index 54dec83ab..b314da1c8 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/ValueGenericsTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/ValueGenericsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(ExperimentalLanguageFeatures) import SwiftParser
 
 final class ValueGenericsTests: PrettyPrintTestCase {
diff --git a/Tests/SwiftFormatTests/PrettyPrint/VariableDeclTests.swift b/Tests/SwiftFormatTests/PrettyPrint/VariableDeclTests.swift
index 0ea10c855..42ead2ab7 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/VariableDeclTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/VariableDeclTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class VariableDeclarationTests: PrettyPrintTestCase {
   func testBasicVariableDecl() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/WhileStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/WhileStmtTests.swift
index 60a9a7463..6c93a6a2c 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/WhileStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/WhileStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class WhileStmtTests: PrettyPrintTestCase {
   func testBasicWhileLoops() {
     let input =
diff --git a/Tests/SwiftFormatTests/PrettyPrint/WhitespaceLintTests.swift b/Tests/SwiftFormatTests/PrettyPrint/WhitespaceLintTests.swift
index 7fa561816..2e20e4c89 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/WhitespaceLintTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/WhitespaceLintTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/PrettyPrint/WhitespaceTestCase.swift b/Tests/SwiftFormatTests/PrettyPrint/WhitespaceTestCase.swift
index 4a707e779..a638bb7e0 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/WhitespaceTestCase.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/WhitespaceTestCase.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 @_spi(Testing) import SwiftFormat
 import SwiftParser
diff --git a/Tests/SwiftFormatTests/PrettyPrint/YieldStmtTests.swift b/Tests/SwiftFormatTests/PrettyPrint/YieldStmtTests.swift
index 8e03a33a5..ad7149e18 100644
--- a/Tests/SwiftFormatTests/PrettyPrint/YieldStmtTests.swift
+++ b/Tests/SwiftFormatTests/PrettyPrint/YieldStmtTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 final class YieldStmtTests: PrettyPrintTestCase {
   func testBasic() {
     let input =
diff --git a/Tests/SwiftFormatTests/Rules/AllPublicDeclarationsHaveDocumentationTests.swift b/Tests/SwiftFormatTests/Rules/AllPublicDeclarationsHaveDocumentationTests.swift
index b3fabac22..327ff5947 100644
--- a/Tests/SwiftFormatTests/Rules/AllPublicDeclarationsHaveDocumentationTests.swift
+++ b/Tests/SwiftFormatTests/Rules/AllPublicDeclarationsHaveDocumentationTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/AlwaysUseLiteralForEmptyCollectionInitTests.swift b/Tests/SwiftFormatTests/Rules/AlwaysUseLiteralForEmptyCollectionInitTests.swift
index acb3535da..f71e150f8 100644
--- a/Tests/SwiftFormatTests/Rules/AlwaysUseLiteralForEmptyCollectionInitTests.swift
+++ b/Tests/SwiftFormatTests/Rules/AlwaysUseLiteralForEmptyCollectionInitTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/AlwaysUseLowerCamelCaseTests.swift b/Tests/SwiftFormatTests/Rules/AlwaysUseLowerCamelCaseTests.swift
index 5d8ffe3db..6d9b91da5 100644
--- a/Tests/SwiftFormatTests/Rules/AlwaysUseLowerCamelCaseTests.swift
+++ b/Tests/SwiftFormatTests/Rules/AlwaysUseLowerCamelCaseTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/AmbiguousTrailingClosureOverloadTests.swift b/Tests/SwiftFormatTests/Rules/AmbiguousTrailingClosureOverloadTests.swift
index 185fe92f4..1546300b7 100644
--- a/Tests/SwiftFormatTests/Rules/AmbiguousTrailingClosureOverloadTests.swift
+++ b/Tests/SwiftFormatTests/Rules/AmbiguousTrailingClosureOverloadTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/AvoidRetroactiveConformancesTests.swift b/Tests/SwiftFormatTests/Rules/AvoidRetroactiveConformancesTests.swift
index 4e6d45239..a3217f6ce 100644
--- a/Tests/SwiftFormatTests/Rules/AvoidRetroactiveConformancesTests.swift
+++ b/Tests/SwiftFormatTests/Rules/AvoidRetroactiveConformancesTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/BeginDocumentationCommentWithOneLineSummaryTests.swift b/Tests/SwiftFormatTests/Rules/BeginDocumentationCommentWithOneLineSummaryTests.swift
index f8b19daf1..1cf33f303 100644
--- a/Tests/SwiftFormatTests/Rules/BeginDocumentationCommentWithOneLineSummaryTests.swift
+++ b/Tests/SwiftFormatTests/Rules/BeginDocumentationCommentWithOneLineSummaryTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
@@ -187,7 +199,7 @@ final class BeginDocumentationCommentWithOneLineSummaryTests: LintOrFormatRuleTe
       /// A set of `Diagnostic` that can answer the question "was there an error?" in O(1).
       struct TestDoubleStraightQuotes {}
 
-      /// A set of `Diagnostic` that can answer the question “was there 
+      /// A set of `Diagnostic` that can answer the question “was there
       /// an error?” in O(1).
       struct TestTwoLinesDoubleSmartQuotes {}
 
diff --git a/Tests/SwiftFormatTests/Rules/DoNotUseSemicolonsTests.swift b/Tests/SwiftFormatTests/Rules/DoNotUseSemicolonsTests.swift
index 3804701ae..9a967f7cc 100644
--- a/Tests/SwiftFormatTests/Rules/DoNotUseSemicolonsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/DoNotUseSemicolonsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/DontRepeatTypeInStaticPropertiesTests.swift b/Tests/SwiftFormatTests/Rules/DontRepeatTypeInStaticPropertiesTests.swift
index d140bdbd2..febd787a9 100644
--- a/Tests/SwiftFormatTests/Rules/DontRepeatTypeInStaticPropertiesTests.swift
+++ b/Tests/SwiftFormatTests/Rules/DontRepeatTypeInStaticPropertiesTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/FileScopedDeclarationPrivacyTests.swift b/Tests/SwiftFormatTests/Rules/FileScopedDeclarationPrivacyTests.swift
index 88e425ac6..82acf48dc 100644
--- a/Tests/SwiftFormatTests/Rules/FileScopedDeclarationPrivacyTests.swift
+++ b/Tests/SwiftFormatTests/Rules/FileScopedDeclarationPrivacyTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 @_spi(Rules) import SwiftFormat
 import SwiftSyntax
diff --git a/Tests/SwiftFormatTests/Rules/FullyIndirectEnumTests.swift b/Tests/SwiftFormatTests/Rules/FullyIndirectEnumTests.swift
index 8b9a7d985..1b91648af 100644
--- a/Tests/SwiftFormatTests/Rules/FullyIndirectEnumTests.swift
+++ b/Tests/SwiftFormatTests/Rules/FullyIndirectEnumTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/GroupNumericLiteralsTests.swift b/Tests/SwiftFormatTests/Rules/GroupNumericLiteralsTests.swift
index abb8c148b..315c8aad8 100644
--- a/Tests/SwiftFormatTests/Rules/GroupNumericLiteralsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/GroupNumericLiteralsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/IdentifiersMustBeASCIITests.swift b/Tests/SwiftFormatTests/Rules/IdentifiersMustBeASCIITests.swift
index 6c4545dba..a7503d42a 100644
--- a/Tests/SwiftFormatTests/Rules/IdentifiersMustBeASCIITests.swift
+++ b/Tests/SwiftFormatTests/Rules/IdentifiersMustBeASCIITests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/ImportsXCTestVisitorTests.swift b/Tests/SwiftFormatTests/Rules/ImportsXCTestVisitorTests.swift
index f4d8cb26f..0c4999019 100644
--- a/Tests/SwiftFormatTests/Rules/ImportsXCTestVisitorTests.swift
+++ b/Tests/SwiftFormatTests/Rules/ImportsXCTestVisitorTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 @_spi(Rules) @_spi(Testing) import SwiftFormat
 import SwiftParser
diff --git a/Tests/SwiftFormatTests/Rules/LintOrFormatRuleTestCase.swift b/Tests/SwiftFormatTests/Rules/LintOrFormatRuleTestCase.swift
index dc69fbef6..0e5756fb2 100644
--- a/Tests/SwiftFormatTests/Rules/LintOrFormatRuleTestCase.swift
+++ b/Tests/SwiftFormatTests/Rules/LintOrFormatRuleTestCase.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 import SwiftFormat
 @_spi(Rules) @_spi(Testing) import SwiftFormat
 import SwiftOperators
diff --git a/Tests/SwiftFormatTests/Rules/NeverForceUnwrapTests.swift b/Tests/SwiftFormatTests/Rules/NeverForceUnwrapTests.swift
index 9d4d61f4b..5ebfa92d9 100644
--- a/Tests/SwiftFormatTests/Rules/NeverForceUnwrapTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NeverForceUnwrapTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NeverUseForceTryTests.swift b/Tests/SwiftFormatTests/Rules/NeverUseForceTryTests.swift
index 907264222..1f1b90be7 100644
--- a/Tests/SwiftFormatTests/Rules/NeverUseForceTryTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NeverUseForceTryTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NeverUseImplicitlyUnwrappedOptionalsTests.swift b/Tests/SwiftFormatTests/Rules/NeverUseImplicitlyUnwrappedOptionalsTests.swift
index 2de8f4ee3..7275875bd 100644
--- a/Tests/SwiftFormatTests/Rules/NeverUseImplicitlyUnwrappedOptionalsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NeverUseImplicitlyUnwrappedOptionalsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoAccessLevelOnExtensionDeclarationTests.swift b/Tests/SwiftFormatTests/Rules/NoAccessLevelOnExtensionDeclarationTests.swift
index 6735b8861..8b53a3874 100644
--- a/Tests/SwiftFormatTests/Rules/NoAccessLevelOnExtensionDeclarationTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoAccessLevelOnExtensionDeclarationTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoAssignmentInExpressionsTests.swift b/Tests/SwiftFormatTests/Rules/NoAssignmentInExpressionsTests.swift
index 9ac022653..928296c59 100644
--- a/Tests/SwiftFormatTests/Rules/NoAssignmentInExpressionsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoAssignmentInExpressionsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoBlockCommentsTests.swift b/Tests/SwiftFormatTests/Rules/NoBlockCommentsTests.swift
index afd82e297..0011c931c 100644
--- a/Tests/SwiftFormatTests/Rules/NoBlockCommentsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoBlockCommentsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoCasesWithOnlyFallthroughTests.swift b/Tests/SwiftFormatTests/Rules/NoCasesWithOnlyFallthroughTests.swift
index 66e7da94a..e5685dd5e 100644
--- a/Tests/SwiftFormatTests/Rules/NoCasesWithOnlyFallthroughTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoCasesWithOnlyFallthroughTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoEmptyLinesOpeningClosingBracesTests.swift b/Tests/SwiftFormatTests/Rules/NoEmptyLinesOpeningClosingBracesTests.swift
index bb555739a..3be66484e 100644
--- a/Tests/SwiftFormatTests/Rules/NoEmptyLinesOpeningClosingBracesTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoEmptyLinesOpeningClosingBracesTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
@@ -32,7 +44,7 @@ final class NoEmptyLinesOpeningClosingBracesTests: LintOrFormatRuleTestCase {
       NoEmptyLinesOpeningClosingBraces.self,
       input: """
         struct {1️⃣
-          
+
           let x: Int
 
           let y: Int
@@ -58,7 +70,7 @@ final class NoEmptyLinesOpeningClosingBracesTests: LintOrFormatRuleTestCase {
       NoEmptyLinesOpeningClosingBraces.self,
       input: """
         var x: Int {1️⃣
-          
+
         //
           return _x
 
@@ -67,7 +79,7 @@ final class NoEmptyLinesOpeningClosingBracesTests: LintOrFormatRuleTestCase {
         var y: Int {3️⃣
 
           get 5️⃣{
-          
+
           //
             return _y
 
diff --git a/Tests/SwiftFormatTests/Rules/NoEmptyTrailingClosureParenthesesTests.swift b/Tests/SwiftFormatTests/Rules/NoEmptyTrailingClosureParenthesesTests.swift
index 0e11de115..f828fd7c2 100644
--- a/Tests/SwiftFormatTests/Rules/NoEmptyTrailingClosureParenthesesTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoEmptyTrailingClosureParenthesesTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoLabelsInCasePatternsTests.swift b/Tests/SwiftFormatTests/Rules/NoLabelsInCasePatternsTests.swift
index ab95fb2ec..4de235f93 100644
--- a/Tests/SwiftFormatTests/Rules/NoLabelsInCasePatternsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoLabelsInCasePatternsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoLeadingUnderscoresTests.swift b/Tests/SwiftFormatTests/Rules/NoLeadingUnderscoresTests.swift
index 8339bed9a..37c732709 100644
--- a/Tests/SwiftFormatTests/Rules/NoLeadingUnderscoresTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoLeadingUnderscoresTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoParensAroundConditionsTests.swift b/Tests/SwiftFormatTests/Rules/NoParensAroundConditionsTests.swift
index 7925b57cf..7a0e22d7f 100644
--- a/Tests/SwiftFormatTests/Rules/NoParensAroundConditionsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoParensAroundConditionsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoPlaygroundLiteralsTests.swift b/Tests/SwiftFormatTests/Rules/NoPlaygroundLiteralsTests.swift
index 3cc205fde..5ded2f33b 100644
--- a/Tests/SwiftFormatTests/Rules/NoPlaygroundLiteralsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoPlaygroundLiteralsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/NoVoidReturnOnFunctionSignatureTests.swift b/Tests/SwiftFormatTests/Rules/NoVoidReturnOnFunctionSignatureTests.swift
index 20247a289..2148e1730 100644
--- a/Tests/SwiftFormatTests/Rules/NoVoidReturnOnFunctionSignatureTests.swift
+++ b/Tests/SwiftFormatTests/Rules/NoVoidReturnOnFunctionSignatureTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/OmitReturnsTests.swift b/Tests/SwiftFormatTests/Rules/OmitReturnsTests.swift
index 74e41dbf9..252c3803a 100644
--- a/Tests/SwiftFormatTests/Rules/OmitReturnsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/OmitReturnsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
@@ -125,13 +137,13 @@ final class OmitReturnsTests: LintOrFormatRuleTestCase {
       OmitExplicitReturns.self,
       input: """
           var f = l.filter { 1️⃣return $0.a != o }
-          var bar = l.filter { 
+          var bar = l.filter {
             2️⃣return $0.a != o
           }
         """,
       expected: """
           var f = l.filter { $0.a != o }
-          var bar = l.filter { 
+          var bar = l.filter {
             $0.a != o
           }
         """,
@@ -146,12 +158,12 @@ final class OmitReturnsTests: LintOrFormatRuleTestCase {
     assertFormatting(
       OmitExplicitReturns.self,
       input: """
-          var f = l.filter { 
+          var f = l.filter {
             1️⃣return $0.a != o // comment
           }
         """,
       expected: """
-          var f = l.filter { 
+          var f = l.filter {
             $0.a != o // comment
           }
         """,
diff --git a/Tests/SwiftFormatTests/Rules/OneCasePerLineTests.swift b/Tests/SwiftFormatTests/Rules/OneCasePerLineTests.swift
index 23c809a8d..a521d6262 100644
--- a/Tests/SwiftFormatTests/Rules/OneCasePerLineTests.swift
+++ b/Tests/SwiftFormatTests/Rules/OneCasePerLineTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/OneVariableDeclarationPerLineTests.swift b/Tests/SwiftFormatTests/Rules/OneVariableDeclarationPerLineTests.swift
index 3b84e467d..4fd1e7554 100644
--- a/Tests/SwiftFormatTests/Rules/OneVariableDeclarationPerLineTests.swift
+++ b/Tests/SwiftFormatTests/Rules/OneVariableDeclarationPerLineTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/OnlyOneTrailingClosureArgumentTests.swift b/Tests/SwiftFormatTests/Rules/OnlyOneTrailingClosureArgumentTests.swift
index d18d03061..b9820b41e 100644
--- a/Tests/SwiftFormatTests/Rules/OnlyOneTrailingClosureArgumentTests.swift
+++ b/Tests/SwiftFormatTests/Rules/OnlyOneTrailingClosureArgumentTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/OrderedImportsTests.swift b/Tests/SwiftFormatTests/Rules/OrderedImportsTests.swift
index 73d33aa77..b3753d7f2 100644
--- a/Tests/SwiftFormatTests/Rules/OrderedImportsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/OrderedImportsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/ReplaceForEachWithForLoopTests.swift b/Tests/SwiftFormatTests/Rules/ReplaceForEachWithForLoopTests.swift
index 6f225b249..4e54352f9 100644
--- a/Tests/SwiftFormatTests/Rules/ReplaceForEachWithForLoopTests.swift
+++ b/Tests/SwiftFormatTests/Rules/ReplaceForEachWithForLoopTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/ReturnVoidInsteadOfEmptyTupleTests.swift b/Tests/SwiftFormatTests/Rules/ReturnVoidInsteadOfEmptyTupleTests.swift
index 17e76607f..bd91eafe2 100644
--- a/Tests/SwiftFormatTests/Rules/ReturnVoidInsteadOfEmptyTupleTests.swift
+++ b/Tests/SwiftFormatTests/Rules/ReturnVoidInsteadOfEmptyTupleTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/TypeNamesShouldBeCapitalizedTests.swift b/Tests/SwiftFormatTests/Rules/TypeNamesShouldBeCapitalizedTests.swift
index fa30409e4..54019b9bb 100644
--- a/Tests/SwiftFormatTests/Rules/TypeNamesShouldBeCapitalizedTests.swift
+++ b/Tests/SwiftFormatTests/Rules/TypeNamesShouldBeCapitalizedTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseEarlyExitsTests.swift b/Tests/SwiftFormatTests/Rules/UseEarlyExitsTests.swift
index b488bdcd1..3bbb03952 100644
--- a/Tests/SwiftFormatTests/Rules/UseEarlyExitsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseEarlyExitsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseExplicitNilCheckInConditionsTests.swift b/Tests/SwiftFormatTests/Rules/UseExplicitNilCheckInConditionsTests.swift
index 062de9927..d526df02b 100644
--- a/Tests/SwiftFormatTests/Rules/UseExplicitNilCheckInConditionsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseExplicitNilCheckInConditionsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseLetInEveryBoundCaseVariableTests.swift b/Tests/SwiftFormatTests/Rules/UseLetInEveryBoundCaseVariableTests.swift
index 60c95989e..6b6174510 100644
--- a/Tests/SwiftFormatTests/Rules/UseLetInEveryBoundCaseVariableTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseLetInEveryBoundCaseVariableTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseShorthandTypeNamesTests.swift b/Tests/SwiftFormatTests/Rules/UseShorthandTypeNamesTests.swift
index 188c7e4f8..7693317d1 100644
--- a/Tests/SwiftFormatTests/Rules/UseShorthandTypeNamesTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseShorthandTypeNamesTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseSingleLinePropertyGetterTests.swift b/Tests/SwiftFormatTests/Rules/UseSingleLinePropertyGetterTests.swift
index 0d66e4654..6a5217361 100644
--- a/Tests/SwiftFormatTests/Rules/UseSingleLinePropertyGetterTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseSingleLinePropertyGetterTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseSynthesizedInitializerTests.swift b/Tests/SwiftFormatTests/Rules/UseSynthesizedInitializerTests.swift
index 858393acd..24e74829b 100644
--- a/Tests/SwiftFormatTests/Rules/UseSynthesizedInitializerTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseSynthesizedInitializerTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseTripleSlashForDocumentationCommentsTests.swift b/Tests/SwiftFormatTests/Rules/UseTripleSlashForDocumentationCommentsTests.swift
index 1691e3c0b..bba0eb147 100644
--- a/Tests/SwiftFormatTests/Rules/UseTripleSlashForDocumentationCommentsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseTripleSlashForDocumentationCommentsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/UseWhereClausesInForLoopsTests.swift b/Tests/SwiftFormatTests/Rules/UseWhereClausesInForLoopsTests.swift
index 1110e63ca..7b4899751 100644
--- a/Tests/SwiftFormatTests/Rules/UseWhereClausesInForLoopsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/UseWhereClausesInForLoopsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Rules/ValidateDocumentationCommentsTests.swift b/Tests/SwiftFormatTests/Rules/ValidateDocumentationCommentsTests.swift
index 3876bbc55..7d75852ea 100644
--- a/Tests/SwiftFormatTests/Rules/ValidateDocumentationCommentsTests.swift
+++ b/Tests/SwiftFormatTests/Rules/ValidateDocumentationCommentsTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Rules) import SwiftFormat
 import _SwiftFormatTestSupport
 
diff --git a/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift b/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift
index ad4be0c76..1727c5220 100644
--- a/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift
+++ b/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift
@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
 @_spi(Internal) @_spi(Testing) import SwiftFormat
 import XCTest
 
diff --git a/build-script-helper.py b/build-script-helper.py
index 6842ae4e8..68c0260f2 100755
--- a/build-script-helper.py
+++ b/build-script-helper.py
@@ -1,16 +1,15 @@
 #!/usr/bin/env python3
-
-"""
-  This source file is part of the Swift.org open source project
-  Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
-  Licensed under Apache License v2.0 with Runtime Library Exception
-  See https://swift.org/LICENSE.txt for license information
-  See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
- ------------------------------------------------------------------------------
- This is a helper script for the main swift repository's build-script.py that
- knows how to build and install the stress tester utilities given a swift
- workspace.
-"""
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift.org open source project
+##
+## Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See https://swift.org/LICENSE.txt for license information
+## See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+##
+##===----------------------------------------------------------------------===##
 
 from __future__ import print_function
 
diff --git a/cmake/modules/SwiftFormatConfig.cmake.in b/cmake/modules/SwiftFormatConfig.cmake.in
index 4c165f9cf..47361fe51 100644
--- a/cmake/modules/SwiftFormatConfig.cmake.in
+++ b/cmake/modules/SwiftFormatConfig.cmake.in
@@ -1,11 +1,14 @@
-#[[
-This source file is part of the swift-format open source project
-
-Copyright (c) 2024 Apple Inc. and the swift-format project authors
-Licensed under Apache License v2.0 with Runtime Library Exception
-
-See https://swift.org/LICENSE.txt for license information
-#]]
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift.org open source project
+##
+## Copyright (c) 2024 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See https://swift.org/LICENSE.txt for license information
+## See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+##
+##===----------------------------------------------------------------------===##
 
 if(NOT TARGET SwiftFormat)
   include("@SWIFT_FORMAT_EXPORTS_FILE@")
diff --git a/cmake/modules/SwiftSupport.cmake b/cmake/modules/SwiftSupport.cmake
index c37055a33..f15b99fd5 100644
--- a/cmake/modules/SwiftSupport.cmake
+++ b/cmake/modules/SwiftSupport.cmake
@@ -1,11 +1,14 @@
-#[[
-This source file is part of the swift-format open source project
-
-Copyright (c) 2024 Apple Inc. and the swift-format project authors
-Licensed under Apache License v2.0 with Runtime Library Exception
-
-See https://swift.org/LICENSE.txt for license information
-#]]
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift.org open source project
+##
+## Copyright (c) 2024 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See https://swift.org/LICENSE.txt for license information
+## See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+##
+##===----------------------------------------------------------------------===##
 
 # Returns the current architecture name in a variable
 #