Added unit tests for easy-to-test utils

[beatgammit]

Also includes some small changes, fixes, and comments here and there.

I still need to figure out how to write tests for the UI, but hopefully this helps a little.

[MV-GH]

I got some examples on how to test the UI in my benchmarks pr, but UiAutomator2 is not 100% reliable though

[beatgammit]

Awesome, I'll check out that branch and try running your examples while I'm at it.

[MV-GH]

They are not unit tests though but its the same way you can do Ui testing through UiAutomator2

[dessalines]

Mark this as ready to review, when its good to go.

[MV-GH]

I think he is gonna add those others tests in a different pr and this is ready

[dessalines]

This also needs the gradle tests to be added to our .woodpecker.yml file.

Add a separate CI step containing ./gradlew testDebug

[beatgammit]

Woodpecker config added and tests pass. I'm going to look into UI tests in a bit, but not as part of this PR.