Expand euler phi function doctest #10401
Merged
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Describe your change:
Improves #9943
The Euler's Phi function doctest is worse than the other functions' doctests in the same file, only covering one case and lacking exception handling for negative numbers, unlike the other functions. This pull request adds exception handling for negative numbers, and expands the doctest with two other cases, to bring it up to standard.
Checklist: