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Welcome to Bun Installation Quickstart TypeScript TypeScript 6 and 7

Watch Mode Debugging REPL bunfig.toml File Types Module Resolution JSX Auto-install Plugins File System Router

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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

Update snapshots in `bun test`

Bun's test runner supports Jest-style snapshot testing with .toMatchSnapshot() .

Use snapshot testing in `bun test`

Bun's test runner supports Jest-style snapshot testing with .toMatchSnapshot() .

Generate code coverage reports with the Bun test runner

Bun's test runner has built-in code coverage reporting . Use it to see how much of your codebase is covered by tests, and where the gaps are.