Post on 10-May-2015
description
Peter Friese - @peterfriese - http://www.peterfriese.de
Bring Back the Fun to Testing Android Apps
with Robolectric
Peter Friese - @peterfriese - http://www.peterfriese.de
Bring Back the Fun to Testing Android Apps
with Robolectric
Peter Friese - @peterfriese - http://www.peterfriese.de
Testing Android Apps with Robolectric
What’s the problem?
Why is Robolectric a solution?
Demo
Peter Friese - @peterfriese - http://www.peterfriese.de
What’s the problem?
Peter Friese - @peterfriese - http://www.peterfriese.de
What’s the problem?
Running tests requires:
• Dexing
• Packaging
• Installation on device / emulator
Dexing
Packaging
Installation
Peter Friese - @peterfriese - http://www.peterfriese.de
Dexing Packaging Installation
Peter Friese - @peterfriese - http://www.peterfriese.de
Robolectric to the rescue!
Run tests in a regular JVM, not on Dalvik VM
• Dexing
• Packaging
• Installation on device / emulator
Peter Friese - @peterfriese - http://www.peterfriese.de
There is another problem…
protected void onCreate(Bundle savedInstanceState) { throw new RuntimeException("Stub!"); }
Peter Friese - @peterfriese - http://www.peterfriese.de
Robolectric Solution:
Shadow Objects
• Intercept class loading
• Rewrite method bodies (using ASM)
• Intercept calls to Android classes, record state in shadow classes
Peter Friese - @peterfriese - http://www.peterfriese.de
FEST - Readability for Your Tests
assertEquals(View.GONE, textView.getVisibility()); !java.lang.AssertionError: expected:<8> but was:<0>
Plain JUnit:
assertThat(textView).isGone(); !java.lang.AssertionError: Expected to be gone but was visible
FEST:
Peter Friese - @peterfriese - http://www.peterfriese.de
Demo
See http://www.peterfriese.de/unit-testing-android-apps-with-robolectric-and-eclipse/ for a step-by-step description of how to set up Robolectric in Eclipse
Peter Friese - @peterfriese - http://www.peterfriese.de
Electrified? Here’s where to get Robolectric / FEST
Web: http://ww.robolectric.org Github: https://github.com/robolectric/robolectric
Web: http://square.github.io/fest-android/ Github: https://github.com/square/fest-android
Peter Friese - @peterfriese - http://www.peterfriese.de
Contact
Peter Friesepeter.friese@zuhlke.com
!Zuhlke Engineering Ltd43 Whitfield StLondonW1T 4HD!+44 7825 688 244
Peter Friese - @peterfriese - http://www.peterfriese.de
Image credits
• Snail - http://www.wallsfeed.com/snail-journey-leaf/
The End