relax mock class name matching

Instead of performing some fuzzy matching on the automatically generated mock
name (the pattern varies between different PHPUnit versions) we can simply
use the actual exact class name.

Author: xabbuh

Tests/Authentication/AuthenticatorManagerTest.php

@@ -368,7 +368,7 @@ public function log($level, $message, array $context = []): void
         $manager = $this->createManager([$authenticator], 'main', true, [], $logger);
         $response = $manager->authenticateRequest($this->request);
         $this->assertSame($this->response, $response);
-        $this->assertStringContainsString('Mock_TestInteractiveAuthenticator', $logger->logContexts[0]['authenticator']);
+        $this->assertStringContainsString($authenticator::class, $logger->logContexts[0]['authenticator']);
     }
 
     private function createAuthenticator(?bool $supports = true)

Tests/Controller/UserValueResolverTest.php

@@ -120,7 +120,7 @@ public function testResolveThrowsAccessDeniedWithWrongUserClass()
         $metadata = new ArgumentMetadata('foo', InMemoryUser::class, false, false, null, false, [new CurrentUser()]);
 
         $this->expectException(AccessDeniedException::class);
-        $this->expectExceptionMessageMatches('/^The logged-in user is an instance of "Mock_UserInterface[^"]+" but a user of type "Symfony\\\\Component\\\\Security\\\\Core\\\\User\\\\InMemoryUser" is expected.$/');
+        $this->expectExceptionMessageMatches(\sprintf('/^The logged-in user is an instance of "%s" but a user of type "Symfony\\\\Component\\\\Security\\\\Core\\\\User\\\\InMemoryUser" is expected.$/', $user::class));
         $resolver->resolve(Request::create('/'), $metadata);
     }