Robolectric Survival Guide

ANDROID PRODUCTS HISTORY

• 2009 Chat (IM)• 2011 XMS• 2012 We started with Robolectric

eBuddy

Android!

Relationships

• Java• Maven• Android• Unit tests

First Android JUnit Test import org.junit.Before; import org.junit.Test; import static org.fest.assertions.api.Assertions.assertThat;

public class MainActivityTest { private MainActivity activity;

@Before public void setUp () throws Exception { activity = new MainActivity(); activity.onCreate( null ); }

@Test public void checkInitialTexts () throws Exception { assertThat( activity.downloadButton.getText() ).isEqualTo( "Download" ); } }

First Android JUnit Test

Android Testing Options

• No tests• POJO• Instrumental tests• Android sources• Mock Android• Robolectric!

What is inside

• Parses resources• Intercepts loading Android

classes • Rewrites method bodies

with Javassist• Binds shadow objects to

new Android objects• Proxies modified objects

First Robolectric Test

Key Points from Demo #1

• Correct path to SDK in the local.properties

• JUnit dependency before Android (IntelliJ IDEA)

• @RunWith(

RobolectricTestRunner.class)

Biggest Issue of Robolectric

• Lack of documentation • Not many examples• Unscheduled releases• http://robolectric.blogspot.nl/

2011/02/how-to-work-on-robolectric-in-parallel.html

Robolectric Drawbacks

• Sometimes magic • PowerMock integration• Time of run for the first test

Shadowing

• http://robolectric.blogspot.nl/2011/01/how-to-create-your-own-shadow-classes.html

• Bind shadow class• Use own Runner instead of

Robolectric• (Submit pull request)

Dependency Injection

RoboGuice 2.0

public class MainActivity extends RoboActivity implements View.OnClickListener { @Inject Bus bus;

@Override public void onCreate( Bundle savedInstanceState ) { bus.register( this ); }

@Override public void onClick( View view ) { bus.post( new DownloadDataEvent( urlInput.getText().toString() ) ); } }

RoboGuice 2.0

Key Points from Demo #2

• InjectingTestRunner• Own AbstractModule

implementation• Run injections before

every test method

Android Real Jar (Robolectric 2.0)

• http://robolectric.blogspot.nl/2011/08/using-robolectric-with-real-android.html

• Robolectric 2.0 alpha

Robolectric or not Robolectric

• Not a question for me• Follow industry

Thank you!