Assert progress of ProgressBar in Espresso test

Issue

I have a ProgressBar which fills in as my user progresses through a sequence of actions.

<ProgressBar
    android:id="@+id/progressBar"
    style="?android:attr/progressBarStyleHorizontal"
    android:indeterminate="false"
    android:max="100"
    android:progress="50"
    ... />

I would like write a test with JUnit and Espresso which asserts the value of the progress attributes at different steps. Something like this...

onView(withId(R.id.progressBar)).check(matches(withProgress(50)));

Nothing similar to the withProgress method seems to exist. What would be a way to assert the progress?

Solution

It would seem Espresso does not allow to check the progress attribute using a ViewInteraction. Although, it is possible to recover the progress bar view directly from the view and to assert its value using assertThat.

@Test
public void ExampleAssertProgressBar(){
    ProgressBar progressBar = activity.getActivity().findViewById(R.id.progressBar);
    int progress = progressBar.getProgress();
    assertThat(progress, equalTo(50));
}

Since this is pretty straightforward, I assume it is the way to go.

Answered By - Olivier Melançon