testing

Create test pyramid and coverage strategy for new feature.

Full integration test plan for multi-component systems.

Check code coverage and use mutation testing to verify test quality.

Design and write unit tests using TDD workflow (Red-Green-Refactor).

Testing multiple components together; contract verification; real I/O (database, HTTP). Use when testing component interactions.

Measuring test quality by mutating code and checking if tests catch mutations.

Load testing, profiling, SLA verification, bottleneck identification.

Generative testing with QuickCheck/Hypothesis; testing properties that should hold for all inputs.

Red-Green-Refactor cycle for test-first development. Write failing test, implement minimal code, refactor safely. Use when developing new features or fixing bugs in test-driven projects.

Creating and managing test data via fixtures, builders, factories, and minimal realistic datasets.

Choosing between mocks, stubs, fakes, spies, and dummies based on testing needs.

Create testing pyramid with unit/integration/E2E strategy. Define coverage targets and high-risk testing. Use when planning tests for features.

Single-unit tests, isolation via mocks/stubs, Arrange-Act-Assert pattern, one assertion per test.