[test] [refactor] Extract Plugin class to separate file
[test] [refactor] Pull up temp dir creation to RepositoryTest
[test] Implement CompoundBundleRepositoryTest
Fix copy-paste bug in CompoundBundleRepository
[test] [refactor] Simplify CompoundBundleRepositoryTest using EasyMock
[test] Implement CompoundBundleRepositoryTest.layeredRepoTest()
[test] Implement CompoundBundleRepositoryTest.shadowingTest()