# Testing New or updated `juju` code will not pass review unless there are tests associated with the code. For code additions, the tests should cover as much of the new code as practical; for code changes, the tests should be updated, or it should be shown that the existing tests suffice. Either way, before requesting a review, you need to show that there is already test coverage and that the new code / refactoring didn’t break anything. * [Integration testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/integration-testing.md) * [Unit testing](https://documentation.ubuntu.com/juju/4.0/contributor/reference/testing/unit-testing.md)