test: add unit test vector to show repeated type constraints

Author: Emyrk

testdata/union/union.go

@@ -3,3 +3,9 @@ package union
 type UnionConstraint[T string | int64] struct {
 	Value T
 }
+
+// Repeated constraints are redundant
+// TODO: Write a mutation to remove redundant constraints
+type Repeated[T string | string | int64 | uint64] struct {
+	Value T
+}

testdata/union/union.ts

@@ -1,5 +1,10 @@
 // Code generated by 'guts'. DO NOT EDIT.
 
+// From union/union.go
+export interface Repeated<T extends string | string | number | number> {
+    readonly Value: T;
+}
+
 // From union/union.go
 export interface UnionConstraint<T extends string | number> {
     readonly Value: T;