PHPUnit Interview Prep

PHPUnit Interview Topics

• Unit vs Integration vs E2E — unit: isolated class; integration: multiple layers; E2E: full browser
• Mock vs Stub — stub returns values; mock also verifies call expectations
• TDD Red-Green-Refactor — write failing test, make it pass, clean up
• Test isolation — each test must be independent with fresh state
• setUp vs setUpBeforeClass — setUp per test; setUpBeforeClass once per class
• Code coverage — line, branch, and path coverage metrics
• expectException — must be called before the throwing code
• assertSame vs assertEquals — assertSame uses ===; assertEquals uses ==