Add basic tests

Done, please review!

Alright, the test output did not show any schema errors! Please review!

Weirdly enough, I found an uninstallation bug, while manually uninstalling the module. I have no idea, why this error is not displayed, when running the tests, but I could even replicate it, when resetting the Database and "only" having this module activated.

I created a separate issue for that: 🐛 Uninstalling the module throws an error Closed: cannot reproduce

Well done! This ensures the module installs and uninstalls without errors and allows us to see schema errors. Helpful addition @Grevil! :)

I'll quickly invest a few minutes on trying to replicate 🐛 Uninstalling the module throws an error Closed: cannot reproduce through tests.

OK, I added two more tests. I couldn't replicate the issue described in 🐛 Uninstalling the module throws an error Closed: cannot reproduce any more (Neither through the provided test nor manually).

Please review the newly added tests!

Well done @Grevil! RTBC!
I closed the other issue.

@Maintainers: Could you please enable automated tests at: https://www.drupal.org/node/3039366/qa →

Thanks :)

The tests are enabled for 2.x.

Thanks for the patch.

Automatically closed - issue fixed for 2 weeks with no activity.