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Welcome to Bun Installation Quickstart TypeScript TypeScript 6 and 7

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Run your tests with the Bun test runner Run tests in watch mode with Bun Migrate from Jest to Bun's test runner Mock functions in `bun test`Spy on methods in `bun test`Set the system time in Bun's test runner Use snapshot testing in `bun test`Update snapshots in `bun test`Generate code coverage reports with the Bun test runner Set a code coverage threshold with the Bun test runner Selectively run tests concurrently with glob patterns Skip tests with the Bun test runner Mark a test as a "todo" with the Bun test runner Set a per-test timeout with the Bun test runner Bail early with the Bun test runner Re-run tests multiple times with the Bun test runner Using Testing Library with Bun Write browser DOM tests with Bun and happy-dom import, require, and test Svelte components with bun test

File SystemTest Runner

Migrate from Jest to Bun's test runner

In many cases, Bun's test runner can run Jest test suites with no code changes. Run bun test instead of npx jest or yarn test .

Run tests in watch mode with Bun

Use the --watch flag to run your tests in watch mode.

Mock functions in `bun test`

Create mocks with the mock function from bun:test .