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

  1. Jay Khimani
    Thanks for sharing the update on this much awaited library. btw, in your example JUnit, I guess you meant to have @Ater on tearDown instead @Before.
  2. W.Elsinga
    Thanks for the correction

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