Adding ArgParser Tests

[memorisecodead]

Conclusions on reserch coverage of the remaining 30 percent: there are methods on the ArgParser.hpp side that take other data types, the example parse_args can take a vector of strings, when in our variant we specifically parse arguments via argc and argv. Consequently, covering the other 30 percent is not a possibility, based on the implementation. Maybe I haven't considered something, I'm waiting for your thoughts on this.

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