All You Need To Know About Android Espresso Testing (Part III)

Learn about Android Espresso Testing

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Android Espresso Testing

In part II, we wrote a test case to verify that the app can create a task and the task will be seen on the screen. In this part III, we will demonstrate one technique on writing tests that involves a RecyclerView.

First we repeatly add some tasks, and then we verify that the last added task is on display. Note that since we are using a RecyclerView, the last item might not be seen, so we need to scroll the RecyclerView before checking.

In order to use RecyclerView related test utils, we have to include the espresso contrib library.

androidTestCompile('com.android.support.test.espresso:espresso-contrib:2.2') {
        exclude module: 'appcompat-v7'
        exclude module: 'support-v4'
        exclude module: 'support-annotations'
        exclude module: 'recyclerview-v7'
    }

Notice that we have to exclude some modules, otherwise there will be conflicts.

Let’s refactor out a addTask() function that will create a new task:

private void addTask(String name) {
    // go to new task screen
    onView(withId(R.id.menu_main_new_task)).perform(click());

    // enter task name
    onView(withId(R.id.new_task_task_name)).perform(click());
    onView(withId(R.id.new_task_task_name)).perform(typeText(name));

    // enter task desc
    onView(withId(R.id.new_task_task_desc)).perform(click());
    onView(withId(R.id.new_task_task_desc)).perform(typeText("some task"));

    // click add button
    Espresso.closeSoftKeyboard();
    onView(withId(R.id.action_button)).perform(click());
}

Then we rewrite the original test to be:

@Test
public void shouldBeAbleToAddTasksAndHaveThemVisible() {
    for (int i = 0; i < 11; i++) {
        addTask("task " + i);
    }

    onView(withId(R.id.task_list)).perform(RecyclerViewActions.scrollToPosition(10));
    onView(withText("task 10")).check(matches(isDisplayed()));
}

Source code can be found here.

~To be continued~

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