sde-testing

Create a comprehensive test plan for a feature or system: coverage targets, test types, tooling, and CI integration

Review existing tests for quality, completeness, and anti-patterns

Write tests for existing code: analyze the code, identify cases to test, and generate complete test file

Contract testing with Pact: consumer-driven contracts, provider verification, preventing breaking API changes. Use when building microservices or APIs consumed by multiple clients.

E2E testing with Playwright: test structure, page objects, authentication, visual testing, CI configuration. Use when writing or improving E2E tests for web applications.

Integration testing for Node.js APIs: Supertest setup, database integration with MongoMemoryServer, test isolation, seed data patterns, and testing middleware. Use when writing API integration tests.

Test-Driven Development workflow: Red-Green-Refactor cycle, when to apply TDD, starting with the simplest case, triangulation, and common pitfalls. Use when practicing TDD or introducing it to a team.

Test data management: factory functions, faker.js, fixture files, database seeding, test isolation, and avoiding flaky tests from shared state. Use when designing test data strategy for a project.

Unit testing patterns with Jest: test structure, mocking, spying, async tests, snapshot testing, and coverage thresholds. Use when writing or improving unit tests for JavaScript/Node.js code.