# Run tests in watch mode with Bun (/docs/guides/test/watch-mode)

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Related: [Run your tests with the Bun test runner](/docs/guides/test/run-tests.md), [Migrate from Jest to Bun's test runner](/docs/guides/test/migrate-from-jest.md), [Mock functions in `bun test`](/docs/guides/test/mock-functions.md), [Spy on methods in `bun test`](/docs/guides/test/spy-on.md), [Set the system time in Bun's test runner](/docs/guides/test/mock-clock.md), [Use snapshot testing in `bun test`](/docs/guides/test/snapshot.md)

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

```sh terminal icon="terminal"
bun test --watch
```

***

Watch mode restarts the running Bun process whenever a file changes. It's fast. In this example, the editor saves the file on every keystroke.

<Frame>
  ![Running tests in watch mode in
  Bun](https://github.com/oven-sh/bun/assets/3084745/dc49a36e-ba82-416f-b960-1c883a924248)
</Frame>

***

See [`bun test`](/test).