[WiP] Added and reviewed tests from @kazesberger

[recena]

This PR aims to rescue interesting tests from #14 (by @kazesberger). These tests are being reviewing and documented.

[lanwen]

wow. It should be splitted to small test methods. Think now it checks EVERITHING.

[recena]

@lanwen Indeed. The PR is [WiP]. I thought to review this kind of things. Anyway, thanks so much.

[jenkinsadmin]

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[oleg-nenashev]

I think it makes sense to extract the test in any case.

@recena , could you please retain the authorship of the original commit? @kazesberger or his company may have strong opinions about it.

[recena]

@oleg-nenashev I don't know what you mean.

[oleg-nenashev]

@recena
Your commit states that the author of the commit is @recena , but the actual author of this code was @kazesberger .

[recena]

@oleg-nenashev I know it. The PR title describes perfectly I'm doing. I did not use his commit because I'm inluding reviews. If you don't agree (once again), please close the PR.

[oleg-nenashev]

I just ask to resubmit changes with the proper author