node-testing

Builds test infrastructure where green means something: explicit runner config, coverage that fails the build instead of decorating it, and mocks that don't lie. The failures this skill fixes: models default to legacy Jest setups, write coverage reports nobody gates on, and stretch component tests into flaky pseudo-E2E.

When NOT to use

• E2E / real-browser flows → out of this repo's scope; route to Playwright and its docs (explicit non-goal).
• Lint → node-lint; tsconfig → node-typescript.
• Wiring jobs/matrices in GitHub Actions → node-ci (this skill defines what to run; that one defines where).

Workflow