Bump phpunit to ^12.5 and adapt tests for PHPUnit 12

[somework]

Motivation

• Upgrade the project to PHPUnit 12.5 to stay current with testing tools and PHP versions.
• Make tests compatible with PHPUnit 12 API changes (mock method helpers and attributes).

Description

• Updated composer.json to require-dev phpunit/phpunit ^12.5.
• Ran composer update phpunit/phpunit -W to refresh the lockfile and upgrade related packages.
• Replaced legacy mock return syntax in tests by using willReturn(...) in DataChunkTest and HeaderChunkTest.
• Migrated docblock @dataProvider and @depends annotations to PHPUnit 12 attributes (#[DataProvider(...)], #[Depends(...)]) and added the attribute imports in AddUserToListTest.

Testing

• Ran composer update phpunit/phpunit -W which completed and upgraded PHPUnit and related packages successfully.
• Ran the test suite with vendor/bin/phpunit; initially the suite failed with 4 errors, and after test fixes the suite passed: OK (67 tests, 121 assertions).

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Codex Task

Summary by CodeRabbit

• Chores
  • Updated PHPUnit development dependency to a newer version
  • Modernized test infrastructure to use updated syntax conventions

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[coderabbitai]

📝 Walkthrough

Walkthrough

PHPUnit dependency upgraded from version ^10.5 to ^12.5 in composer.json. Test files updated to use PHPUnit 12-compatible syntax: mock expectations simplified to willReturn() format and Javadoc annotations converted to PHP 8 attributes.

Changes

Cohort / File(s)	Summary
Dependency Management composer.json	PHPUnit require-dev version bumped from ^10.5 to ^12.5
Mock Syntax Updates tests/LinguaLeo/ExpertSender/Chunks/DataChunkTest.php, tests/LinguaLeo/ExpertSender/Chunks/HeaderChunkTest.php	Mock expectations refactored from will($this->returnValue(...)) to concise willReturn(...) syntax
PHP 8 Attributes Migration tests/LinguaLeo/ExpertSender/Request/AddUserToListTest.php	Test annotations converted from Javadoc-style comments (@dataProvider, @depends) to PHP 8 attributes (#[DataProvider], #[Depends])

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Hopping through tests with a PHPUnit cheer,
Version twelve arrives with modernization here,
Mock syntax simplified, attributes so keen,
Your test suite now gleams in bright PHP green! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: upgrading PHPUnit to version 12.5 and updating tests to be compatible with PHPUnit 12 API changes.

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✨ Finishing touches

• 📝 Generate docstrings

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