Android tests are flaky on GitHub Actions

[bartekpacia]

Issues found when running on GHA:

• sometimes no tests are found at all

• sometimes NullPointerException. This and this is SO question that looks relevant. See also Sometimes NullPointerException is thrown when using native features #613.

  java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.UiAutomation.setOnAccessibilityEventListener(android.app.UiAutomation$OnAccessibilityEventListener)
  

• sometimes the Android emulator doesn't start

• sometime the AVD cache step is in bad mood and does this – gets stuck at downloading cache and times out (workflow run link):

  

I've never encountered them locally.

[mateuszwojtczak]

Let's add this to Known issues section in docs

[bartekpacia]

https://emulator.wtf looks like a very nice alternative to GitHub Actions.