Testing Rules

Language-Specific References

Read a language reference only when the repository uses that language and the reference affects the current test or check:

• TypeScript/Vitest: references/typescript.md

Repository commands and established conventions take precedence over generic examples.

TDD Process

Use RED → GREEN → REFACTOR when a behavior change can be represented by a focused failing test.

RED

1. Write or select a test that observes the required behavior.
2. Run it and confirm the current implementation does not satisfy the new expectation.
3. If the test already passes, inspect whether the outcome is already satisfied, the test observes the wrong boundary, or implementation work is still required elsewhere.