Support live server tests with Selenium

[hansegucker]

Close #1854

[niklasmohrin]

Very cool, I feel that there are some parts that could be cleaned up or need some more explanation otherwise:

[niklasmohrin]

Manager group was not present, but only if all tests are run. We found that django will first run django.test.TestCase instances, then django.test.TransactionTestCase and then unittest.TestCase. After the first, the database is cleared. If only running the live server test, the database is still there when running the test.

Link dump if we try to debug this again:

• https://code.djangoproject.com/ticket/23640
• https://code.djangoproject.com/ticket/23727
• https://docs.djangoproject.com/en/5.0/howto/initial-data/#provide-initial-data-with-migrations
• https://docs.djangoproject.com/en/5.0/topics/testing/overview/#test-case-serialized-rollback
• http://atodorov.org/blog/2017/12/26/on-pytest-django-and-liveservertestcase-with-initial-data/

We concluded that we want to migrate an empty database, dump it, and use that dump as a fixture in the live server test - at least for now, to continue working on this.

[hansegucker]

@Kakadus @niklasmohrin @richardebeling Finally, the last test has been migrated and I'm ready for a final review. 🥳

[richardebeling]

Not yet fully reviewed, will have to look through most of the ported tests still, but generally this is looking very nice. Thanks!

[niklasmohrin]

Getting chromium or firefox should be a lot easier now that we have nix, we can work something out together some time if you want :)

[Kakadus]

Heey, there is a green check now! 🎉

@hansegucker do you want to take over and resolve the open threads? If not, I can also finish this : )

Things I fixed:

• we no longer supported django.contrib.auth.backends.ModelBackend, I switched to our evap.evaluation.auth.RequestAuthUserBackend (since Make natural key of userprofile unique #2249)
• increased window size so that all elements should be visible now
• compile scss&ts before testing the frontend
• separate firefox into a separate nix shell / CI job

[richardebeling]

Looking good! I especially like the changes to package.json and package-lock.json.

Haven't re-checked yet whether all ported tests assert the same things as the old tests, will need to re-do that in a final review.

[niklasmohrin]

Very cool! After ensuring that I follow the steps from CI, they also passed locally :)

[richardebeling]

@Kakadus you re-requested review but some of the older review discussion points are still open. I'm generally fine with the code once these are resolved.