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AndroidJUnit4 Aliases the current default Android JUnit 4 class runner, for future-proofing. 
AndroidJUnitRunner An Instrumentation that runs JUnit3 and JUnit4 tests against an Android package (application). 
MonitoringInstrumentation An instrumentation that enables several advanced features and makes some hard guarantees about the state of the application under instrumentation. 
MonitoringInstrumentation.ActivityFinisher Loops through all the activities that have not yet finished and explicitly calls finish on them. 
UsageTrackerFacilitator Helper class to enable/disable usage tracker in the runner.