test-doubles

A test stub provides canned answers to calls made during testing, while a test mock verifies that specific interactions occur. This Skill explains the full test double taxonomy, helping you distinguish stubs, mocks, spies, dummies, and fakes.

To fix fragile xUnit tests, you should refactor anti-patterns using established patterns like Minimal Fixture and Four-Phase Test. This Skill identifies test smells such as fragile, obscure, and eager tests, offering solutions for robust automated tests.

Use a test spy when you need to record interactions for later verification rather than asserting them upfront like a test mock. This Skill provides comprehensive guidance on selecting the appropriate test double taxonomy for maintainable testing.

A Four-Phase Test structures xUnit tests into setup, exercise, verify, and teardown stages. This Skill guides you in implementing this pattern alongside Fresh Fixture and Minimal Fixture patterns to write reliable and understandable tests.

Common test smells include fragile, obscure, and eager tests that reduce maintainability. This Skill helps you identify these anti-patterns and apply xUnit test patterns and test doubles to refactor them into robust automated tests.

You need xUnit patterns when writing new automated tests to ensure they are maintainable and reliable. This Skill offers guidance on selecting appropriate test doubles and applying patterns like Fresh Fixture to achieve effective software design.