Bugfix to avoid applying user-specific Settings in the Unit Test

[SpocWeb]

Hi, thank you for maintaining this Code. I found a small bug, because I have modified regional settings. Please consider merging it. I would also like to expand the descriptions and comments in the code to make it better comprehensible. Would you mind accepting such PRs? Regards... Matt

[SpocWeb]

I added Class Diagrams. To view them you need to add the "Class Designer" Visual Studio Component