Learn about unit testing Android applications

1. TESTING ANDROID
Marc Chung
OpenRain
marc.chung@openrain.com
Friday, August 28, 2009 1

2. Agenda
Introduce Android testing concepts
Unit and mock testing + Demos
Android testing overview + Demos
Q&A
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3. Unit testing in Java
JUnit is the most popular framework
Most projects, frameworks, IDEs will ship with support
Out of the box, Eclipse IDE has good JUnit support
There are many frameworks
http://en.wikipedia.org/wiki/List_of_unit_testing_frameworks#Java
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4. Unit testing demo
Twitter Demo
Uses JUnit
Login/password
Update status
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5. public void testStatusUpdate() {
try {
IMyTwitter twitter = new MyTwitter("supertesting", "s3!kretep@s5");
TwitterClient client = new TwitterClient(twitter);
String update = "Hello Phoenix Android";
client.post(update);
Assert.assertEquals(update, client.getLatestPost());
} catch (TwitterException te) {
Assert.fail("Shouldn't see this because the credentials are correct");
}
}
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6. Mock Objects in Java
A Mock is “fake” object which mimics real objects for the
purpose of testing
Mimics real objects for testing
Such as a web service request
Mocking is a style of testing
http://martinfowler.com/articles/mocksArentStubs.html
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7. Mock testing demo
Twitter Demo
Uses EasyMock
Avoid issuing live requests
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8. public void testStatusUpdate() {
String updateStatus = "Hello Phoenix Android";
IMyTwitter mockedTwitter = EasyMock.createMock(IMyTwitter.class);
expect(mockedTwitter.getStatus()).andReturn(null);
expect(mockedTwitter.updateStatus(updateStatus)).andReturn(null);
replay(mockedTwitter);
TwitterClient client = new TwitterClient(mockedTwitter);
client.post(updateStatus);
Assert.assertEquals(updateStatus, client.getLatestPost());
verify(mockedTwitter);
}
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9. Android Testing
Testing Android requires JUnit
Write tests to run and test parts of your application
InstrumentationTestRunner runs your test as an application
Executes code on emulator
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10. Setting up your project
Using the command line tool will create a tests/ directory
inside the project.
android create project -t 3 -n hello_world -p hello_world -a HelloWorld -k com.openrain.hello_world
Use Eclipse manually.
Doesn’t create a tests/ directory
Manually create two projects.
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11. Running Android tests
Two ways to run your tests
Command line runner
Eclipse runner
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12. AndroidTestCase
unit testing
faster and easier to boot strap
only have access to a Context
useful for asserting layout, position, and components
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13. ActivityInstrumentationTestCase
functional unit testing
access to a real live Activity instance
may simulate key events
slower
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14. Instrumentation Demo
Functional tests
Test drives the Activity
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15. Other Android tests
ServiceTestCase
For testing services
ActivityUnitTestCase and ActivityTestCase
For testing an Activity in isolation
ApplicationTestCase
Full integration testing
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16. More Android testing
Testing APIs
http://developer.android.com/reference/android/test/package-summary.html
android.test
android.test.mock
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17. Tips
Isolate and test non-Android code separately.
Functional tests use live objects. Slow, but reliable.
Javadoc is your friend
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18. Future topics
Code coverage tools
Continuous integration tools
Performance testing
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19. Thank you
Join Phoenix Android Mailing list
http://phoenixandroid.com
Follow me on Twitter:
@heisenthought
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