Improve test speed

[JoeZiminski]

PR #635 investigated an issue in which tests suddenly became very slow (fixed in #641). However, it also highlighted some changes that can generally speed up the tests and help troubleshooting:

1. add durations argument to pytest in the workflows to print how long each test takes
2. focus on the TUI tests, which are by far the slowest
3. removing codecov actually decreases test speed by like 5 minutes, but it is almost certainly not worth removing this.
4. connection tests are also slow

[adamltyson]

Any idea why codcov makes a difference? All it should do is upload an xml (I think) file to a server somewhere.

[Edu92337]

Hi! I'd like to work on this issue. I'm planning to start by profiling the test suite with pytest --durations to identify the slowest tests, then focus on TUI and connection tests as suggested. Is there anything else I should know before starting?

[JoeZiminski]

Hey @adamltyson not too sure why it does add so much time. It does seem to write a lot of text files when it is in progress, so maybe doing a lot of reading / writing + the actual operations to determine coverage might take some time? Not too sure though and only very quickly looked into it.

[JoeZiminski]

Hey @Edu92337 thanks for your interest! I made some notes here on a related PR. Otherwise I don't have much to add, please feel free to ask any questions and open draft PRs to prototype this.