Update BackgroundMatcher to compare GradientDrawables

[sarn0ld]

At the moment, when you use assertHasBackground() with a drawable like this:

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="@color/yellow" />
</shape>

then an exception is thrown because the drawable height and width are zero.

Instead of using DrawableToBitmapConverter a ShapeDrawable (=GradientDrawable) should be checked directly like a ColorDrawable.

[Sloy]

Thank you for the fix @sarn0ld!
Could you add a test for this scenario to the suite? There are some existing tests for other kinds of backgrounds using assertHasBackground in the AssertionsTest file.

[rocboronat]

Hello @sarn0ld !

Thanks a lot for the PR!

As Barista is becoming a project used by thousands, may you mind adding a test that reproduces the issue you describe?

Thanks a lot again! :·)

[sarn0ld]

Hey @Sloy @rocboronat !
Sure! I added tests that are analoge to the ColorDrawable Tests. Thanks for the hint about the AssertionsTest file!

Please feel free to edit my changes if something is wrong or different than you'd expect it to be!
My lunch break is over so this is all I can contribute for now. :-)

[alorma]

Hi @sarn0ld

We updated the library package, so now this PR has some conflicts that needs to be fixed before merge.

We will solve the conflicts before merge.