EDIT: I solved this I’m writing a test for a class handling a 3rd party analytics library. The class...

# mockk

[Peter Farlow]

EDIT: I solved this
I’m writing a test for a class handling a 3rd party analytics library. The class under test needs to handler an Analytics object, but unfortunately mockk<Analytics>() cannot create a mock because of a static android Handler in that class:

public class Analytics { // this is 3rd party code I can't change

  static final Handler HANDLER =
      new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
          throw new AssertionError("Unknown handler message received: " + msg.what);
        }
      };
// rest of class here
}

I tried using both mockk<Analytics>() and adding mockkConstructor(Handler::class) but that didn’t work. Any suggestions?

[Peter Farlow]

For those not in Android world, the Handler class is not present in JVM unit tests, so the failure message states java.lang.RuntimeException: Method getMainLooper in android.os.Looper not mocked

[Peter Farlow]

actually, I didn’t realize until I copy / pasted that error message that it was complaining about Looper and not Handler

[Peter Farlow]

oops

[Peter Farlow]

I think I can fix this

[Peter Farlow]

Ah, yes, as soon as I added this snippet, my test works!

[Peter Farlow]

mockkStatic(Looper::class)
        every { Looper.getMainLooper() } returns mockk()

[Peter Farlow]

thank you to everyone here for helping me rubber duck debug rubber duck

[Mattia Tommasone]

🙂