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Test Pyramid in Practice
2.1Beyond the Textbook DiagramEvery QA engineer has seen the test pyramid. Few teams implement it well. The gap between "I know what the pyramid is" and "I can analyze…2.2The Classic Test Pyramid (Mike Cohn, 2009)- Many unit tests at the base: fast, cheap, isolated, run on every commit - Fewer integration tests in the middle: verify component…2.3The Testing Trophy (Kent C. Dodds, 2018)The trophy inverts the emphasis for frontend-heavy applications:2.4The Testing Diamond and HoneycombThe diamond emerges naturally in microservice architectures where: - Individual services have thin business logic (narrow unit test layer)…2.5Anti-Patterns: When the Shape Is WrongSymptoms: - Test suite takes hours to run - Most tests are flaky because they depend on the full stack - Developers do not run tests…2.6Mapping Your Current Test Suite to the PyramidCategorize every test in your suite:2.7Cost Analysis: Cost Per Test TypeAssume a bug in the checkout flow that could be caught at any level:2.8Practical Exercise: Audit Your Project's Test Distribution1. Count your tests by type. Use your test runner's output or directory structure.2.9Hands-On Exercise1. Run the audit above on your current project and draw the shape of your test suite 2. Identify your 3 most expensive E2E tests (by…