Unit (Karma) tests fail with --watch=false

[NicMcPhee]

ng test passes fine. ng test --watch=false passes all the tests, and then fails at the end with:

TOTAL: 22 SUCCESS
Chrome 88.0.4324.150 (Mac OS 10.15.7) ERROR
  Some of your tests did a full page reload!

No idea if this happened in the past, but I don't remember it and don't know why it's happening now. Some searching suggests this was a recent problem in Karma but should be fixed in the version we have in the Spring 2021 branch.

I don't know if this will interact badly with the GitHub Actions since they presumably only run the tests once?

[helloworld12321]

After some testing, we were able to reproduce this issue on Mac, but not on Windows.

[NicMcPhee]

This doesn't seem to happen anymore, even on Macs, so I assume that some updates somewhere made this go away. I'm going to close it for now, and we can re-open it if someone finds it happening again.