Include Phpactor PHPUnit TestCase

Author: dantleech

composer.json

@@ -9,12 +9,14 @@
         }
     ],
     "require": {
-        "webmozart/path-util": "^2.3"
+        "webmozart/path-util": "^2.3",
+        "dms/phpunit-arraysubset-asserts": "dev-master",
+        "phpspec/prophecy-phpunit": "dev-master"
     },
     "require-dev": {
-        "phpunit/phpunit": "~7.0",
+        "phpunit/phpunit": "^9.0",
         "friendsofphp/php-cs-fixer": "~2.15.0",
-        "phpstan/phpstan": "~0.11.0"
+        "phpstan/phpstan": "^0.12.0"
     },
     "autoload": {
         "psr-4": {

tests/Integration/WorkspaceTest.php

@@ -7,7 +7,7 @@
 
 class WorkspaceTest extends IntegrationTestCase
 {
-    public function setUp()
+    protected function setUp(): void
     {
         $this->workspace = Workspace::create($this->workspaceDir());
         $this->workspace->reset();
@@ -78,7 +78,7 @@ public function testPutFileContents()
     {
         $this->workspace->put('foobar', 'foobar contents');
         $this->assertTrue($this->workspace->exists('foobar'));
-        $this->assertContains('foobar contents', $this->workspace->getContents('foobar'));
+        $this->assertStringContainsString('foobar contents', $this->workspace->getContents('foobar'));
     }
 
     public function testGetPathWithNoArgs()