A quick review of the EasyMock mocking (testing) framework and how it can make your testing more productive and less tightly coupled by Matthew McCullough.

1. EasyMock 101
A 30 Minute Review by Matthew McCullough

2. ❶ What Is Mocking?

3. Are You Mocking Me?
• A fake object
• Allows for more modular testing
• Records and verifies expectations of calls

4. ❷ Creating A Mock

5. IEnumeration<Short> iEnumIntfMock =
EasyMock.createMock(EnumeratedAttribute.class);

6. ❸ Expectations

7. Expecting A Lot
• Expect method is called on mock
• Expect sequence of method calls on mock
(call createStrictMock())
• Expect parameters to methods calls on
mock

8. Expect A Call
EasyMock.expect(iEnumIntfMock.getNumberOfRows()
);

9. Expect A Return
EasyMock.expect(iEnumIntfMock.getNumberOfRows()
).andReturn(5);

10. ❹ Replaying

11. Replay
• Prime the pump to walk through expected
call sequence
• Provide return values in same sequence
• Listen to usage of call parameters

12. Replay Kickoff
EasyMock.replay(iEnumIntfMock);

13. ❺ Using The ClassUnderTest

14. Testing
• Call all functions as you normally would
• Pass in mock where injectable
• Consider how mock can be passed into
internal references

15. Testing
int numOfRows =
iEnumIntfMock.getNumberOfRows();
Assert.assertTrue(quot;Number of rows does not
matchquot;, numOfRows > 0);

16. ❻ Verifying

17. • Called after all operations with the mock
are done
• Compares the usage to the recording

18. Verifying
EasyMock.verify(iEnumIntfMock);

19. ❼ Resources

20. Resources
• EasyMock.org
• Groovy Mocking
http://docs.codehaus.org/display/GROOVY/Groovy+Mocks