Code Coverage

In my current position one of the metrics we track is code coverage for our unit tests. When I started at the company we were using JUnit with Mockito and JaCoCo. This was a pretty good setup we got good coverage reports and Mockito makes the testing writing much easier.

One of the limitations of Mockito is that you can’t mock private methods or static methods. This presented an issue for us in reaching our desired level of coverage. We initially worked around some of the private method issues using reflection, but it wasn’t always ideal. The decision was made to use PowerMock. PowerMock solved all of our Mockito issues immediately. It was compatible with Mockito but gave us some new powerful features to allow us to get much better unit test coverage. Then we ran our Jacoco reports and found that the reporting no longer worked. Due to the way PowerMock uses byte code manipulation in order to mock static methods it is not compatible with JaCoCo and there is no plan for them to support measuring that.