TST/REF: Parameteratized tests
Thinking at this agian, I think that my main assumption that this test can be parameteraize is wrong, because it's __not__ different values that goes into the exact asserts, it's different values with different asserts.

I could go and parameteraize parts of it, but it won't help and in fact it will do worse, it will be harder to maintain (IMO).

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Reopen this if you disagree.