Add espresso test for usernames.

app/src/main/java/org/thoughtcrime/securesms/util/views/CircularProgressMaterialButton.kt

@@ -9,6 +9,7 @@ import android.util.AttributeSet
 import android.view.ViewAnimationUtils
 import android.widget.FrameLayout
 import androidx.annotation.StringRes
+import androidx.annotation.VisibleForTesting
 import androidx.core.animation.doOnEnd
 import androidx.core.content.withStyledAttributes
 import com.google.android.material.button.MaterialButton
@@ -88,6 +89,11 @@ class CircularProgressMaterialButton @JvmOverloads constructor(
     materialButton.setOnClickListener(onClickListener)
   }
 
+  @VisibleForTesting
+  fun getRequestedState(): State {
+    return requestedState
+  }
+
   fun setSpinning() {
     transformTo(State.PROGRESS, true)
   }