sdcorejs-testing-philosophy

An effective test pyramid relies on a broad base of fast unit tests, a smaller middle layer of integration tests, and minimal e2e tests. This distribution maximizes execution speed and confidence while minimizing brittle, slow-running top-layer failures.

In integration testing, you should mock external services to isolate your system, while hitting your owned databases and routers to validate real interactions. This approach ensures stable, meaningful tests without creating brittle dependencies on third-party systems.

You can write tests during development using disciplined timing: before code for TDD, during building for test-as-you-go, or after for diff-scoped tests. Avoid anti-patterns by ensuring tests always match intended behaviour and outcomes.

To stop brittle assertions, adopt a behaviour-over-implementation testing approach that validates visible outcomes rather than private methods or internal state shape. Using Arrange-Act-Assert structure ensures readable tests expressing verified behaviour.

Yes, behaviour driven testing requires an Arrange-Act-Assert structure to produce stable, meaningful tests. This structure enforces readable tests that clearly express verified behaviour and outcomes instead of focusing on implementation details.