My Robolectric overview done on Android meet-up hosted by Xebia The final code from the presentation with additional examples will be here: https://github.com/emartynov/robolectric-presentation

1. Robolectric Survival Guide

2. eBuddy
• 2009 Chat (IM)
• 2011 XMS
• 2012 We started with Robolectric
ANDROID PRODUCTS HISTORY

3. Android!

4. Relationships
• Java
• Maven
• Android
• Unit tests

5. 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" );
}
}

6. First Android JUnit Test

7. Android Testing Options
• No tests
• POJO
• Instrumental tests
• Android sources
• Mock Android
• Robolectric!

8. What is inside
• Parses resources
• Intercepts loading Android
classes
• Rewrites method bodies
with Javassist
• Binds shadow objects to
new Android objects
• Proxies modified objects

9. First Robolectric Test

10. Key Points from Demo #1
• Correct path to SDK in the
local.properties
• JUnit dependency before
Android (IntelliJ IDEA)
• @RunWith(
RobolectricTestRunner.class)

11. 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

12. Robolectric Drawbacks
• Sometimes magic
• PowerMock integration
• Time of run for the first test

13. Shadowing
• http://robolectric.blogspot.nl/2
011/01/how-to-create-your-
own-shadow-classes.html
• Bind shadow class
• Use own Runner instead of
Robolectric
• (Submit pull request)

14. Dependency Injection

15. 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() ) );
}
}

16. RoboGuice 2.0

17. Key Points from Demo #2
• InjectingTestRunner
• Own AbstractModule
implementation
• Run injections before
every test method

18. Android Real Jar (Robolectric 2.0)
• http://robolectric.blogspot.nl
/2011/08/using-robolectric-
with-real-android.html
• Robolectric 2.0 alpha

19. Robolectric or not Robolectric
• Not a question for me
• Follow industry

20. Thank you!