Android TDD & CI

Android
TDD &
Marcin Gryszko
@mgryszko

walking
skeleton
“Implementation of the
thinnest possible slice of
real functionality that we
can automatically build,
deploy, and test end-to-
end”
original idea by Alistair Cockburn

Iteration “zero”
TDD cycle

0
1. Understand the problem
2. Think about architecture
3. Automate

Failing acceptance test
public class TimelineTest extends ActivityInstrumentationTestCase2<TimelineActivity> {

public void test_chirps_are_displayed_timely_ordered() throws Exception {
timelineDriver.waitUntilTimelineLoaded(mgryszkosChirps().size());
assertTimelineEqualTo(timelineDriver.getDisplayedTimeline(), mgryszkosChirps());
}
}

Page object
public class TimelineDriver {
private Solo solo;
public TimelineDriver(Solo solo) { this.solo = solo; }

public void waitUntilTimelineLoaded(int timelineSize) {
solo.waitForView(TableRow.class, timelineSize, 5000);
}

public List<Chirp> getDisplayedTimeline() {
ListView timelineView = (ListView) solo.getView(R.id.timelineView);
List<Chirp> chirps = new ArrayList<Chirp>();
for (int i = 0; i < timelineView.getCount(); i++) {
chirps.add((Chirp) timelineView.getItemAtPosition(i));
}
return chirps;
}
}

Failing acceptance test

private Solo solo;
private TimelineDriver timelineDriver;

protected void setUp() throws Exception {
super.setUp();
solo = new Solo(getInstrumentation(), getActivity());
timelineDriver = new TimelineDriver(solo);
}

public void test_chirps_are_displayed_timely_ordered() throws Exception {
timelineDriver.waitUntilTimelineLoaded(mgryszkosChirps().size());
assertTimelineEqualTo(timelineDriver.getDisplayedTimeline(), mgryszkosChirps());
}

private void assertTimelineEqualTo(List<Chirp> actual, List<Chirp> expected) {
assertEquals(expected, actual);
}
}

Passing acceptance test
public class TimelineActivity extends Activity {
public void onCreate(Bundle savedInstanceState) { // super.onCreate & setContentView omitted
List<Chirp> chirps = loadTimeline();
displayTimeline(chirps);
}

private List<Chirp> loadTimeline() {
return executeJsonRequest("http://...", "mgryszko");
}

private List<Chirp> executeJsonRequest(String uri, Object... requestParams) {
RestTemplate restTemplate = new RestTemplate();
return asList(restTemplate.getForObject(uri, Chirp[].class, requestParams));
}

private void displayTimeline(List<Chirp> chirps) {
TimelineAdapter adapter = new TimelineAdapter();
adapter.setActivity(this);
adapter.setChirps(chirps);
ListView timelineView = (ListView) findViewById(R.id.timelineView);
timelineView.setAdapter(adapter);
}
}

Hamcrest

assertEquals(expected, actual);
}
}

Hamcrest

assertThat(actual.size(), equalTo(expected.size()));
for (Chirp chirp : expected) {
assertThat(format("Chirp %s not in the timeline", chirp), actual, hasItem(chirp));
}
}
}

Roboguice
TimelineAdapter adapter = new TimelineAdapter();
adapter.setActivity(this);
adapter.setChirps(chirps);
ListView timelineView = (ListView) findViewById(R.id.timelineView);
}
}

Roboguice
public class TimelineActivity extends RoboActivity {
@InjectView(R.id.timelineView)
private ListView timelineView;

TimelineAdapter adapter = getInjector()
.getInstance(TimelineAdapter.class)
.withChirps(chirps));
}
}

Falling integration test
public class ChirpJsonRepositoryTest extends TestCase {
private ChirpRepository repository = new ChirpJsonRepository();

public void test_returns_the_timeline_of_a_chirper() {
assertTimelineEqualTo(repository.findTimelineOf("mgryszko"), mgryszkosChirps());
}
}

Passing integration test
public class ChirpJsonRepository implements ChirpRepository {
public List<Chirp> findTimelineOf(String chirper) {
return executeJsonRequest("http://...", chirper);
}

}
}

return executeJsonRequest("http://...", "mgryszko");
}

}
}

public class TimelineActivity extends RoboActivity {
@Inject
private ChirpRepository chirpRepository;

return chirpRepository.findTimelineOf("mgryszko");
}
}

Async loading
public class TimelineActivity extends RoboActivity
implements TimelineLoadListener {

@Inject
private AsyncTimelineLoader timelineLoader;

private void loadTimeline() {
timelineLoader.loadChirperTimeline("mgryszko", this);
}

public void timelineLoaded(List<Chirp> timeline) {
displayTimeline(timeline);
}
}

public interface TimelineLoadListener {
void timelineLoading();

void timelineLoaded(List<Chirp> timeline);
}

Async loading
public class TimelineLoadTask extends RoboAsyncTask<List<Chirp>>
implements AsyncTimelineLoader {

public void loadChirperTimeline(String chirper, TimelineLoadListener loadListener) {
this.execute();
}

@Override
protected void onPreExecute() throws Exception {
loadListener.timelineLoading();
}

public List<Chirp> call() throws Exception {
return repository.findTimelineOf(chirper);
}

@Override
protected void onSuccess(List<Chirp> chirps) throws Exception {
loadListener.timelineLoaded(chirps);
}
}

First unit test
public class TimelineLoadTaskTest extends RoboUnitTestCase<Application> {

private Mockery context = new Mockery();
private ChirpRepository repository = context.mock(ChirpRepository.class);
private TimelineLoadListener loadListener = context.mock(TimelineLoadListener.class);

public void test_loads_timeline_successfully_and_notifies_the_listener() {
TimelineLoadTask task = createTimelineLoadTask();

context.checking(new Expectations() {{
List<Chirp> timeline = asList(A_CHIRP);

oneOf(loadListener).timelineLoading();
oneOf(repository).findTimelineOf(CHIRPER); will(returnValue(timeline));
oneOf(loadListener).timelineLoaded(with(timeline));
}});

executeInFakeUIThread(task);
}
}

First unit test
private CountDownLatch taskDone = new CountDownLatch(1);

private TimelineLoadTask createTimelineLoadTask() {
return new TimelineLoadTask(repository) {
@Override
protected void onFinally() {
taskDone.countDown();
}
};
}

private void executeInFakeUIThread(final TimelineLoadTask task) {
new RoboLooperThread() {
public void run() {
task.loadChirperTimeline(CHIRPER, loadListener);
}
}.start();
taskDone.await();
}
}

straight JUnit
IntelliJ
java.lang.RuntimeException: Stub!
at junit.runner.BaseTestRunner.(BaseTestRunner.java:5)

Maven
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.024
sec

TestNG
IntelliJ
===============================================
Custom suite
Total tests run: 1, Failures: 0, Skips: 0
===============================================

Maven
Running TestSuite
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.298
sec

Robolectric
@RunWith(InjectingTestRunner.class)
public class TimelineUnitTest {
@Inject
private TimelineActivity activity;

@Inject
private AsyncTimelineLoaderStub timelineLoader;

@Test
public void triggers_timeline_loading() {
activity.onCreate(NO_SAVED_INSTANCE_STATE);
assertThat(timelineLoader.isTimelineLoaded(), is(true));
}

@Test
public void progress_dialog_is_displayed_when_timeline_is_loaded() {
activity.timelineLoading();
assertThat(Robolectric.shadowOf(activity).getLastShownDialogId(),
is(TimelineActivity.PROGRESS_DIALOG_ID));
}
}

https://github.com/mgryszko/android-
tdd-ci

you
?
jobs Marcin
@
osoco.es

Image sources:
http://www.flickr.com/photos/sarah_mccans/219287847/
http://www.flickr.com/photos/f-oxymoron/5005146417/
http://www.bluebison.net/content/2007/a-skeleton-walking-his-pets/
http://www.flickr.com/photos/familymwr/5009855774/
http://www.flickr.com/photos/zbraineater/2213219097/
http://www.flickr.com/photos/stusev/3296738594/
http://www.flickr.com/photos/hadamsky/293310259/
http://www.flickr.com/photos/qthomasbower/3392847831/
http://www.flickr.com/photos/mikecogh/5113779851/

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