talk from DroidCon 2013 Berlin

1. Unit Testing
with Robolectric
DroidCon Berlin
Danny Preussler, ebay Kleinanzeigen

2. • Since 2012 Lead Engineer Android @
ebay Kleinanzeigen
• Before Team Lead Mobile Enterprise
Solutions @ Cortado
• C++ Developer @ PSI AG
• Started career as developer @ Alcatel
• articles in: android360, mobile Technology,
Java Magazin
• speaker: Blackberry Developer Conference SF,
DroidCons
Believe in mobile
who's that guy?

3. eBay Kleinanzeigen
Android app:
• free app
• 2 Mio downloads
• 176 K Daily UV
• 4.1/5 stars
(>6K ratings)

4. SOLID
FOUNDATION
Flughafen Berlin-Brandenburg, Blick in die Abflughalle by Muns CC BY 3.0
http://commons.wikimedia.org/wiki/File:120513-BER-innen.JPG

5. Raus aus der Garage!
Tidy garage by Bryn Pinzgauer CC 2.0
http://www."ickr.com/photos/12394349@N06/4492572621/in/photostream/

6. • Junit 4
(out for 6+ years!!)
• Use all your
utilities
(i.e. mocking)
• Use your coverage
framework
• Use CI tools
without Android
plugins (sonar)
Scyscrapers by elminium, CC 2.0 http://www."ickr.com/photos/lumen850/5461476268/in/
photostream/

7. Pure JUnit?
java.lang.RuntimeException: Stub!
Android Firewall by Uncalno, CC BY 2.0 "ickr.com/photos/uncalno/8538679708

8. Separate Java and Android Code?
• Android is not Java!
• Intent, Bundle,
SparseArray, Uri.. not
fancy device classes!
• Context everywhere
• Recreate the
System! (interface
UI {...} ?)
Great Wall of China (IV) by isawnyu. CC 2.0 http://
www."ickr.com/photos/isawnyu/7183821643/in/
photostream/

9. Allows loading of Android Classes
in pure Java projects

10. static Intent createIntent(Context context, String query,
String value) {
Intent i = new Intent(context, AdListActivity.class);
i.putExtra(AppConstants.QUERY, query);
i.putExtra(AppConstants.VALUE, queryString);
return i;
}
@Test
public void createIntentForQuery() {
Context c = new AdListActivity();
Intent intent =
MyActivity.createIntent(c, "key", "value");
assertNotNull(intent);
}

11. In practice (with programs of several thousand lines of
code), we haven't discovered any signi!cant di"erences
between the two VMs, and we would consider any
di"erence to be a bug in one or the other VM.“
https://sites.google.com/site/androiddevtesting/
Is this valid?

12. static Intent createIntent(Context context, String query,
String value) {
Intent i = new Intent(context, AdListActivity.class);
i.putExtra(AppConstants.QUERY, query);
i.putExtra(AppConstants.VALUE, queryString);
return i;
}
@Test
public void createIntentForQuery() {
Context c = mock(Context.class);
Intent intent =
MyActivity.createIntent(c, "key", "value");
assertNotNull(intent);
}

13. what's this mock thing?
Martin Fowler:
„test-doubles ... pre-programmed with
expectations “

14. mocks...
TelephonyManager mgr =
mock(TelephonyManager.class);
when(mgr.getDeviceId()).thenReturn("123456");
...
verify(mgr).getDevice();and/or
verifyNoMoreInteractions(mgr);

15. MyPreferences pref = spy(new MyPreferences(ctx))
...
spys...
verify(pref).saveTitle(same(title));
verify(pref).savePersonalData(anyString());

16. Let’s do some Magic…
magic by digitlizedchaos, CC 2.0
"ickr.com/photos/digitizedchaos/4889987210/
in/photostream/

17. @Test
public void checkPhoneNumberIsHidden() {
MyActivity activity = new MyActivity();
activity.onCreate();
TextView tv = (TextView)
activity.findViewById(R.id.callText);
assertEquals(View.GONE, tv.getVisibility());
}

18. long shadows by Matthew Photography CC 2.0 "ickr.com/photos/
21560098@N06/8064387720/in/photostream/
let's talk about shadows...

19. Dead End - mid by bennylin0724, CC BY 2.0
flickr.com/photos/benny_lin/191393604

20. 2.0

21. 2.0
@Test @Values(qualifiers = "fr-land")
public void
shouldShowBucolicFrenchLandscape() throws
Exception {
// ...
}
• less shadows, more real code
(goal is to remove 99% of shadows)
• since alpha2: support package complete shadow free
• aims for sherlock supported, library support
• performance boost
• Value quali$ers:

22. Thank you
for coming!
dpreussler@ebay.com

23. Wanna work with us?
eBay Kleinanzeigen
http://goo.gl/3GCJk
mobile.de
http://goo.gl/JYsXM