Fix PHPUnit warning for mocks without expectation, use stubs instead

[GromNaN]

Fix the new notice of PHPUnit 12.5.0.

A PHPUnit notice is now emitted for test methods that create a mock object but do not configure an expectation for it

Example of PHPUnit notice when running ./vendor/bin/phpunit --display-all-issues:

1) Doctrine\Tests\Persistence\Mapping\AbstractClassMetadataFactoryTest::testItGetsTheSameMetadataForBackslashedClassName
No expectations were configured for the mock object for Doctrine\Persistence\Mapping\Driver\MappingDriver. You should refactor your test code and use a test stub instead.

[Copilot]

Pull request overview

This PR addresses a new PHPUnit 12.5.0 notice by replacing createMock() with createStub() for test doubles that don't require expectation configuration. The changes eliminate warnings about mock objects created without expectations, following PHPUnit's best practice of using stubs for simple return values and mocks only when verifying behavior.

Key changes:

• Replaced createMock() with createStub() for objects used as simple return values or dependencies without behavior expectations
• Added atLeast(0) expectations in FileDriverTest for methods that need to be called but don't require strict verification
• Added a never() expectation in ManagerRegistryTest to properly configure a mock that should not have a specific method called

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/ObjectManagerDecoratorTest.php	Converted repository, class metadata, and metadata factory mocks to stubs as they serve as return values
tests/Mapping/FileDriverTest.php	Converted class metadata mocks to stubs; added atLeast(0) expectations to file locator for methods that act as stubs
tests/Mapping/DriverChainTest.php	Converted class metadata and mapping driver mocks to stubs for test fixtures
tests/Mapping/ClassMetadataFactoryTest.php	Converted driver and metadata mocks to stubs in setup and test methods
tests/Mapping/AbstractClassMetadataFactoryTest.php	Converted driver and metadata mocks to stubs for simple return values
tests/ManagerRegistryTest.php	Converted repository and metadata mocks to stubs; added never() expectation to object manager mock
tests/Event/PreUpdateEventArgsTest.php	Converted object manager mock to stub in test setup

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[greg0ire]

Thanks @GromNaN !