Android Testing Support Library announced

During the Droidcon UK 2014, Stephan Linzner of Google announced the upcoming Android Testing Support Library. This means Google is (finally) taking testing Android apps seriously.

The library is a unbundled static testing library for Android that containers all Android testing frameworks by Google. It will become a available through the Android Support repository and as open source in AOSP.

So what does it contain?

• AndroidJUnitRunner
  This Runner, based on android.test.InstrumentationTestRunner, runs JUnit3 and JUnit4 tests against an Android package (application). Let me give an example:
  @RunWith (JUnit4.class)
  public class MyJUnit4Test {
  {
    Droidcon mDroidconUK;
   
    @Before
    public void setUp() {
      mDroidconUK = new Droidcons.get(Droidcon.UK);
      mDroidconUK.open();
    }
  
    @Test
    public void checkPreconditions() {
      assertNotNull("mDroidconUK cannot be null", mDroidconUK);
    }
  
    @After
    public void tearDown() {
      mDroidconUK.close();
    }
  }

• Espresso
  Introduced at the GTAC in 2013, Espresso makes it possible to write concise, beautiful, and reliable Android UI tests quickly. Lets look at some examples:
  // Find view using a Matcher and type text using a ViewAction
  onView(withId(R.id.message_edit_text)).perform(typeText(TEXT_MESSAGE), closeSoftKeyboard());
  
  // Perform a click ViewAction
  onView(withId(R.id.send_button)).perform(click());
  
  // Verify using a ViewAssertion
  onView(withId(R.id.received_message_text_view)).check(matches(withText((TEXT_MESSAGE))));

• Intento
  Intento is like Mockito but for Intents. Basically a mock framework that allows you to create and configure mock objects. Let me give you an example:
  public void testDailerInput_typeNumberAndCall() {
   
    //Type phonenumber in dialer
    onView(withId(R.id.send_data_to_call_edit_text)).perform(scrollTo(), typeText("123-345-6789"), closeSoftKeyboard());
   
    // Click the call button
    onView(withId(R.id.send_to_call_button)).perform(scrollTo(), click());
   
    //Validate Intent has been send
    intended(allOf(
        hasAction(Intent.ACTION_CALL),
        toPackage("com.android.phone"),
        hasData(allOf(hasSchemaSpecificPart("tel", "123-345-6789")))),
        times(1));
  }

In conclusion: Testing with Android is finally becoming a more prominent part of Android Development cycle with the introduction of the Android Testing Support Library