Espresso 2.1: ActivityTestRule

When I wrote my android-test-demo app, I wanted to use Jake Wharton's ActivityRule, but couldn't because I wanted to customize the launch intent for each test method.

Today I got my solution from Google: Test rules in Espresso 2.1. ActivityTestRule can be configured to take a different launch intent per test method like this:

@Rule
public ActivityTestRule activityRule = new ActivityTestRule<>(
    MainActivity.class,
    true,    // initialTouchMode
    false);  // launchActivity. False to set intent per method

I then supply a launch intent in the test method:

@Test
public void intent() {
  DateTime dateTime = new DateTime(2014, 10, 15, 0, 0, 0);
  Intent intent = new Intent();
  intent.putExtra(MainActivity.KEY_MILLIS, dateTime.getMillis());

  activityRule.launchActivity(intent);

  onView(withId(R.id.date))
      .check(matches(withText("2014-10-15")));
}

See MainActivityTest.java for more details.

ActivityTestRule makes tests much cleaner. Thank you Google for making Espresso better and better!

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