Fix webui unit-tests
I've tried to run webui unit-tests. Here's what I did:
rake build_ui export CHROME_BIN=chromium cd webui npx ng test
An example error in the first comment.
- investigate why the tests are failing. If they're non-sense, mark them as such.
- extend developer's guide with a description how to run webui tests. A single section or a list of steps will do.
- look at running those tests as part of CI.
The last step can easily be moved to a separate ticket.