PHPUnit

Test behavior, not implementation. Tests are executable documentation — if the test name doesn't explain what the code does, rewrite it.

PHPUnit is PHP's standard testing framework. It uses test case classes extending TestCase, setUp()/tearDown() for fixtures, and a full assertion API. All patterns target PHPUnit 11+ on PHP 8.5+. Use PHP 8 attributes exclusively — annotations are deprecated in 11, removed in 12.

References

• Assertion catalog, constraints, exception expectations → [${CLAUDE_SKILL_DIR}/references/assertions.md] — Full assertion API grouped by category, constraint system, custom assertions
• Test doubles — stubs, mocks, MockBuilder → [${CLAUDE_SKILL_DIR}/references/mocking.md] — createStub vs createMock, return config, invocation matchers, argument constraints, MockBuilder
• Data providers — static, named, generators → [${CLAUDE_SKILL_DIR}/references/data-providers.md] — #[DataProvider], #[TestWith], named datasets, generator providers, external providers
• phpunit.xml structure, test suites, source config → [${CLAUDE_SKILL_DIR}/references/configuration.md] — XML elements, strict settings, source element, coverage reports, execution order