rethink unit test style to remove duplication

[teleivo (Ivo Ulrich)]

related to this, and making it easy to write unit tests, I suggest we tackle:

replace use of Context.getService with dependencies and injection

Hi there, while working on addition of missing tests one encounters a lot of Context.getXxxService like for example here: This has as multiple side effects: its a pain to write a unit tests since you need to use PowerMockRunner to mock the static Context see example of PatientServiceImplTest if you write unit tests using PowerMockRunner it will not show up in coverage due to a limitation in PowerMockRunner/Jacoco see https://issues.openmrs.org/browse/TRUNK-5150 since its hard, devs tend…