Enforce failing tests before implementation in the zoppy-api NestJS project.
npx skills add https://github.com/Zoppy-crm/.github --skill tdd-zoppy-crm
Please help me install this Agent Skill. Skill: tdd Source: https://github.com/Zoppy-crm/.github/tree/main/skills/backend/tdd Command: npx skills add https://github.com/Zoppy-crm/.github --skill tdd-zoppy-crm
Ensures tests are written before implementation to prevent regressions, clarify expected behavior, and reduce flaky or brittle test suites in the zoppy-api NestJS codebase.
Create failing tests for the target NestJS domain or controller, run them to confirm failure, then implement the minimal code until all tests pass following Red-Green-Refactor.
High-intent search queries and answers about installing and using this skill.
NestJS testing structure maps unit tests to src/domain, integration tests to src/application, and E2E controller tests to src/access/http. This layer-specific approach uses co-located spec files to ensure deterministic test runs.
A failing-first testing workflow requires writing failing tests before implementation, confirming the failure, and then writing minimal code to pass. This Red-Green-Refactor cycle clarifies expected behavior and prevents regressions.
Flaky test suites often occur when mocking internal domains instead of external services. You can fix this by using in-memory SQLite via TestUtils and applying structured lifecycle hooks for deterministic test runs.
During integration testing, you should only mock external services and never mock internal domains. This explicit mocking rule isolates external dependencies while preserving true domain logic for reliable behavior validation.
Yes, you can use in-memory SQLite via TestUtils for E2E controller tests. Configuring in-memory SQLite provides a fast, isolated database state that ensures deterministic test runs without persistent data side effects.
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