Bring Back the Fun to Testing Android Apps with Robolectric
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The document discusses the challenges of testing Android applications and introduces Robolectric as a solution by enabling tests to run in a regular JVM rather than on the Dalvik VM. It outlines how Robolectric addresses issues such as dexing, packaging, and installation, and describes features like shadow objects for intercepting class loading and rewriting method bodies. Additionally, it mentions the benefits of using FEST for improved readability in testing assertions.
Bring Back the Fun to Testing Android Apps with Robolectric
- 1. Bring Back the Fun to Testing Android Apps with Robolectric Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 2. Bring Back the Fun to Testing Android Apps with Robolectric Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 3. Testing Android Apps with Robolectric What’s the problem? Why is Robolectric a solution? Demo Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 4. What’s the problem? Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 5. What’s the problem? Running tests requires: • Dexing Dexing • Packaging Packaging • Installation on device / emulator Installation Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 6. Dexing Packaging Peter Friese - @peterfriese - http:/ /www.peterfriese.de Installation
- 7. 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
- 8. There is another problem… protected void onCreate(Bundle savedInstanceState) { throw new RuntimeException("Stub!"); } Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 9. 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
- 10. FEST - Readability for Your Tests Plain JUnit: assertEquals(View.GONE, textView.getVisibility()); ! java.lang.AssertionError: expected:<8> but was:<0> FEST: assertThat(textView).isGone(); ! java.lang.AssertionError: Expected to be gone but was visible Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 11. 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
- 12. Electrified? Here’s where to get Robolectric / FEST Web: http:/ /ww.robolectric.org Github: https:/ /github.com/robolectric/robolectric Peter Friese - @peterfriese - http:/ /www.peterfriese.de Web: http:/ /square.github.io/fest-android/ Github: https:/ /github.com/square/fest-android
- 13. Contact Peter Friese ter.friese@zuhlke.com pe ! td Zuhlke Engineering L 43 Whitfield St London W1T 4HD ! +44 7825 688 244 Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 14. Image credits • Snail - http:/ /www.wallsfeed.com/snail-journey-leaf/ Peter Friese - @peterfriese - http:/ /www.peterfriese.de
- 15. The End