Finish tests #25
Description
So there is the set of tests in https://github.com/animafps/glicko2.ts/blob/main/glicko2.test.ts with a bunch of todo functions that require filling out to complete 100% coverage
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So there is the set of tests in https://github.com/animafps/glicko2.ts/blob/main/glicko2.test.ts with a bunch of todo functions that require filling out to complete 100% coverage