Add more tests

[HenningSE]

Before you submit this PR: make sure to put all XENONnT specific information in a wiki-note as the repo is publicly accessible

What does the code in this PR do / what does it improve?

This PR will add a bunch of additional tests to fuse.

Please include the following if applicable:

• Tests to check the (new) code is working as desired.

[coveralls]

Pull Request Test Coverage Report for Build 9107814489

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+6.5%) to 78.0%

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Totals
Change from base Build 9107806265:	6.5%
Covered Lines:	2301
Relevant Lines:	2950

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💛 - Coveralls

[ramirezdiego]

Looks good. Covering more and more :)