minor symfony#61472 [PhpUnitBridge] Code cleanup (nicolas-grekas)

This PR was merged into the 7.4 branch.

Discussion
----------

[PhpUnitBridge] Code cleanup

| Q             | A
| ------------- | ---
| Branch?       | 7.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

Commits
-------

594a5c8 [PhpUnitBridge] Code cleanup

Author: nicolas-grekas

.github/workflows/unit-tests.yml

@@ -255,7 +255,7 @@ jobs:
 
       - name: Run PhpUnitBridge tests with PHPUnit 9.6
         if: '! matrix.mode'
-        run: |
-          ./phpunit src/Symfony/Bridge/PhpUnit
         env:
           SYMFONY_PHPUNIT_VERSION: '9.6'
+        run: |
+          ./phpunit src/Symfony/Bridge/PhpUnit

src/Symfony/Bridge/PhpUnit/Legacy/PolyfillTestCaseTrait.php

@@ -270,7 +270,8 @@
         exit($exit);
     }
 
-    $alteredCode = file_get_contents($alteredFile = './src/Runner/PhptTestCase.php');
+    // Mutate PhptTestCase code
+    $alteredCode = file_get_contents($alteredFile = is_file('./src/Runner/PHPT/PhptTestCase.php') ? './src/Runner/PHPT/PhptTestCase.php' : './src/Runner/PhptTestCase.php');
     if (str_contains($alteredCode, "            'report_memleaks=0',\n")) {
         $alteredCode = str_replace("            'report_memleaks=0',\n", '', $alteredCode);
         file_put_contents($alteredFile, $alteredCode);
@@ -282,8 +283,6 @@
         if ($PHPUNIT_REMOVE_RETURN_TYPEHINT) {
             $alteredCode = preg_replace('/^    ((?:protected|public)(?: static)? function \w+\(\)): void/m', '    $1', $alteredCode);
         }
-        $alteredCode = preg_replace('/abstract class TestCase[^\{]+\{/', '$0 '.\PHP_EOL."    use \Symfony\Bridge\PhpUnit\Legacy\PolyfillTestCaseTrait;", $alteredCode, 1);
-        file_put_contents($alteredFile, $alteredCode);
 
         // Mutate Assert code
         $alteredCode = file_get_contents($alteredFile = './src/Framework/Assert.php');