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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

Set the system time in Bun's test runner

Set the system time in tests with the setSystemTime function from bun:test .

Spy on methods in `bun test`

Use the spyOn utility to track method calls with Bun's test runner.

Use snapshot testing in `bun test`

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