backend-testing

Write backend tests by co-locating `*.test.ts` files with route files and using the `bun:test` framework. The skill provides guidance on test setup, element mocking, and common assertion patterns to validate route and service correctness.

Set up backend test fixtures in TypeScript using provided test helpers like `initTests` and `testFetcher`. These helpers establish structured test file layouts, apply authentication guardrails, and ensure data isolation across the backend layer.

Backend testing with Bun works for integration tests and service validation by applying the built-in `bun:test` framework to codebases organized with route files. It covers test setup, fixtures, and common backend test patterns.

Authentication and data isolation guardrails during backend route testing are enforced through the skill's structured test setup and helper functions. This ensures tests remain deterministic and isolated without leaking data between test cases.

You do not need external testing libraries to automate backend test execution with Bun, as it relies entirely on Bun's built-in test framework. It provides native support for test automation, fixtures, and assertions without extra dependencies.