EasyMock 101A 30 Minute Review by Matthew McCullough

❶ What Is Mocking?

• A fake object

• Allows for more modular testing

• Records and verifies expectations of calls

Are You Mocking Me?

❷ Creating A Mock

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

❸ Expectations

• Expect method is called on mock

• Expect sequence of method calls on mock(call createStrictMock())

• Expect parameters to methods calls on mock

Expecting A Lot

EasyMock.expect(iEnumIntfMock.getNumberOfRows());

Expect A Call

EasyMock.expect(iEnumIntfMock.getNumberOfRows()).andReturn(5);

Expect A Return

❹ Replaying

• Prime the pump to walk through expected call sequence

• Provide return values in same sequence

• Listen to usage of call parameters

Replay

EasyMock.replay(iEnumIntfMock);

Replay Kickoff

❺ Using The ClassUnderTest

• Call all functions as you normally would

• Pass in mock where injectable

• Consider how mock can be passed into internal references

Testing

int numOfRows = iEnumIntfMock.getNumberOfRows();

Assert.assertTrue("Number of rows does not match", numOfRows > 0);

Testing

❻ Verifying

• Called after all operations with the mock are done

• Compares the usage to the recording

EasyMock.verify(iEnumIntfMock);

Verifying

❼ Resources

• EasyMock.org

• Groovy Mockinghttp://docs.codehaus.org/display/GROOVY/Groovy+Mocks

Resources