Problem

I am setting-up unit-test code coverage for an Android library which uses Robolectric to run the tests and PowerMock/Mockito for mock-testing.

However, running unit-tests with Cobertura results in the following Exception...

:example:testDebugUnitTest
Exception in thread "Thread-5" java.lang.ExceptionInInitializerError
    at com.example.package.saas.Query$RemoveWordsType.__cobertura_init(Query.java)
    at com.example.package.saas.Query$RemoveWordsType.<clinit>(Query.java)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at net.sourceforge.cobertura.coveragedata.TouchCollector.applyTouchesToSingleClassOnProjectData(TouchCollector.java:123)
    at net.sourceforge.cobertura.coveragedata.TouchCollector.applyTouchesOnProjectData(TouchCollector.java:110)
    at net.sourceforge.cobertura.coveragedata.ProjectData.saveGlobalProjectData(ProjectData.java:272)
    at net.sourceforge.cobertura.coveragedata.SaveTimer.run(SaveTimer.java:33)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Shutdown in progress
    at java.lang.ApplicationShutdownHooks.add(ApplicationShutdownHooks.java:66)
    at java.lang.Runtime.addShutdownHook(Runtime.java:211)
    at net.sourceforge.cobertura.coveragedata.ProjectData.initialize(ProjectData.java:239)
    at net.sourceforge.cobertura.coveragedata.ProjectData.getGlobalProjectData(ProjectData.java:209)
    at net.sourceforge.cobertura.coveragedata.TouchCollector.<clinit>(TouchCollector.java:45)
    ... 11 more

...and the generated Cobertura report shows no coverage at all.

Running the same testcase without PowerMock*, the tests run fine and the coverage report is generated successfully:

​* i.e. commenting the tests using PowerMock, removing the PowerMockIgnore annotation, the PowerMockRule and the MockitoAnnotations.initMocks(this); invocation.

Investigation

• I see that some users fixed a similar issue by setting forkmode="once" in their testsuite.
  However, this is not the solution as I am using Gradle which defaults on Java projects to ForkMode.ONCE.
• Other users reporting a similar issue fixed it by updating PowerMock to 1.5.4.
  I tried downgrading to this version, but the issue remains.
• Finally, a similar issue was fixed by explicitly specifying a dependency to cobertura-runtime, but adding it didn't change anything either.

Question

Is it possible to use Cobertura in conjunction with PowerMock?

• In that case, what am I missing?
• Otherwise, how should I measure code coverage with such a setup (Android Library + Robolectric + PowerMock)?

Solution 1:

Right now, Android Studio integrates jacoco automatically to do code coverage.

You just need to add a few lines of code:

apply plugin: 'jacoco-android'

android {
   buildTypes {
      debug {
         testCoverageEnabled = true
      }
   }
}

More information here:

• http://blog.wittchen.biz.pl/test-coverage-report-for-android-application/