Improve client testing #17713
Description
Describe the problem
Currently issues like #17711 go unnoticed through our CI because there is really no testing of client code.
Solution brainstorm
There must be a way to test that client code works well. I'd like to have some direct testing of JavaScript code that updating deps didn't break anything, but our code might not be ready for that.
Describe alternatives you have considered
We might look into extending Selenium tests. It might be even possible to fail on JavaScript errors there.
Screenshots
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Additional context
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