Investigate on making test classes better for Core library

[kanchanbohra]

@kanchanbohra just asked be in a chat that she would like to merge to get some further work going. I think an issue for the following most important point:

• Check exported const used in test. Often they are created multiple times in local scope or in global scope but only used once
• Investigate if there isn't an easier way than this test class to do some tests (rather unit than integration tests)
• Do the minor concrete changes from @marikaner

@marikaner do you also see other urgent points which need to be tackeled before merging?

Yes, basically my comment from above ;)

Originally posted by @marikaner in #6 (comment)

[deekshas8]

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