EclEmma code coverage plugin and PowerMockRunner

Question

I met a problem of using EclEmma plugin in Eclipse. It doesn't show code coverage when I use annotation @RunWith passing (PowerMockRunner.class) as an argument. In case of using (MockitoJUnitRunner.class) everything is fine. Waiting for your suggestions? :)

Answer 1

This is a known problem with Eclemma (JaCoCo). Basically both libraries modify byte code but Mockito modifies it during runtime which produces a different binary .class file. JaCoCo apparently uses keeps track of the classes it's watching via a hashMap whose hashcode is derived by the class definition so the hashcode will be different after Mockito modifies the class so JaCoco can't find the class in it's internal Maps anymore.

Discussed in more detail:

Why EclEmma doesn't coverage code with tests with @RunWith(PowerMockRunner.class)

Emma code coverage with JUnit and Powermock

http://code.google.com/p/powermock/issues/detail?id=402