Stack-agnostic testing principles, strategies, and patterns for building reliable test suites. Use when the user asks to design a test strategy, choose between unit/integration/e2e tests, apply TDD, fix flaky tests, improve test quality, use test doubles (mocks, stubs, fakes, spies), or review tests
Stack-agnostic testing principles, strategies, and patterns for building reliable test suites. Use when the user asks to design a test strategy, choose between unit/integration/e2e tests, apply TDD, fix flaky tests, improve test quality, use test doubles (mocks, stubs, fakes, spies), or review tests for antipatterns. Covers the testing pyramid, test design heuristics, arrange-act-assert structure,