Tests For Epiweeks And Epiyear Formatting

[AFg6K7h4fhy2]

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[AFg6K7h4fhy2]

While I do not yet have a decent mental representation of which sorts of tests I would like to include here, I want to note that this issue constitutes part of a move to add more tests to this repository. The first instance of adding tests will likely occur via #28 , which is being done in #34 . As such, this issue will be completed once the aforementioned issues are complete. Since I am not certain when more rigorous testing will be prioritized, I am adding this issue to the Backlog, rather than to the Sprint [November 11, November 22]. Once the scope of tests covered in this issue are decided, I will edit #12 (comment) to include the scope.