Context getColor in activity and AndroidJunit4 return different result. Why?

Question

I'm getting color (i.e. R.color.my_white is FFFFFFFF ) from my resource as below

ContextCompat.getColor(getContext(), R.color.my_white)

And when I perform AndroidJUnit4 testing, I also get the same color.

ContextCompat.getColor(getContext(), R.color.my_white)

However their return value differs, where in the actual activity, it is -1, and in the Instrumental Test, it is 520093696. Why is that differing?

(I suspect that the instrumental test context return a different result)

Answer 1

I found the way to do it. The getContext() in the AndroidJunit4 is not working correctly. So I use

 activityRule.activity.getColor(R.color.my_white)

Where activityRule is

@Rule
@JvmField
var activityRule: ActivityTestRule<MainActivity> = ActivityTestRule(MainActivity::class.java)