We have some tests that from time to time fail in our CI jobs:

• 1) Symfony\Bundle\FrameworkBundle\Tests\Functional\CachePoolsTest::testCachePools
  Failed asserting that true is false.
  
  /home/runner/work/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/CachePoolsTest.php:93
  /home/runner/work/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/CachePoolsTest.php:24
  

• 1) Symfony\Component\HttpClient\Tests\AmpHttpClientTest::testNonBlockingStream
  Failed asserting that two strings are identical.
  --- Expected
  +++ Actual
  @@ @@
  -'<1>'
  +''
  
  /home/runner/work/symfony/symfony/src/Symfony/Component/HttpClient/Tests/HttpClientTestCase.php:128
  

• 1) Symfony\Component\ErrorHandler\Tests\ErrorEnhancer\ClassNotFoundErrorEnhancerTest::testEnhance with data set #4 ('Interface "Foo\Bar\WhizBangIn... found', 'Attempted to load interface "...space?')
  UnexpectedValueException: RecursiveDirectoryIterator::__construct(/home/runner/work/symfony/symfony/src/Symfony/Component/AssetMapper/Tests/Fixtures/.!!AB1/cache/test/Symfony/Config/Framework/Assets): Failed to open directory: No such file or directory 
  

PRs welcome to make them more resilient.