bun.sh/docs/guides/test/watch-mode.md

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Run tests in watch mode with Bun

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

$ bun test --watch

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This will restart the running Bun process whenever a file change is detected. It's fast. In this example, the editor is configured to save the file on every keystroke.

{% image src="https://github.com/oven-sh/bun/assets/3084745/dc49a36e-ba82-416f-b960-1c883a924248" caption="Running tests in watch mode in Bun" /%}

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See Docs > Test Runner for complete documentation on the test runner.