jutsu-bun:bun-testing

Bun's test runner uses Jest-compatible APIs to write tests with describe and test blocks, expect assertions, and lifecycle hooks. Create a test file, import bun:test, organize tests with describe/test, and run bun test to execute them with fast performance.

Yes, Bun's test runner includes built-in mocking facilities to isolate units during testing. Mock modules and functions directly within your test blocks to verify behavior in isolation without external dependencies.

Bun's test runner supports snapshot testing, allowing you to capture and validate expected output over time. Write snapshot tests using expect().toMatchSnapshot() to detect unintended changes in your code's behavior.

You need a Bun environment installed and JavaScript or TypeScript code to test. Bun's test runner is built-in, so no additional setup beyond Bun itself is required to start writing tests.

Bun's test runner supports lifecycle hooks like beforeEach, afterEach, beforeAll, and afterAll within describe blocks. Use these hooks to configure test state before each test runs and clean up resources afterward.

Bun's test runner supports coverage measurement to track how much of your code is tested. Run tests with coverage flags to identify untested code paths and improve test completeness.