11 files declare their use of PhpUnitWarnings
- AppendOpTest.php in core/tests/ Drupal/ Tests/ Composer/ Plugin/ Scaffold/ Integration/ AppendOpTest.php 
- AssertUtilsTrait.php in core/tests/ Drupal/ Tests/ Composer/ Plugin/ Scaffold/ AssertUtilsTrait.php 
- BrowserTestBase.php in core/tests/ Drupal/ Tests/ BrowserTestBase.php 
- BuildTestBase.php in core/tests/ Drupal/ BuildTests/ Framework/ BuildTestBase.php 
- ConfigTest.php in core/tests/ Drupal/ Tests/ Composer/ Plugin/ VendorHardening/ ConfigTest.php 
- FileStorageTest.php in core/tests/ Drupal/ Tests/ Component/ PhpStorage/ FileStorageTest.php 
- KernelTestBase.php in core/tests/ Drupal/ KernelTests/ KernelTestBase.php 
- ReplaceOpTest.php in core/tests/ Drupal/ Tests/ Composer/ Plugin/ Scaffold/ Integration/ ReplaceOpTest.php 
- SkipOpTest.php in core/tests/ Drupal/ Tests/ Composer/ Plugin/ Scaffold/ Integration/ SkipOpTest.php 
- UnitTestCase.php in core/tests/ Drupal/ Tests/ UnitTestCase.php 
- VendorHardeningPluginTest.php in core/tests/ Drupal/ Tests/ Composer/ Plugin/ VendorHardening/ VendorHardeningPluginTest.php 
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