Do some minor linting of test files

[AlanCoding]

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Feature type

New Feature

Feature Summary

I saw we had an unused import in a test file, and this is a good example of something we would like to enforce with automated checks for the content in tests/ folder.

I'm fairly sure we don't want to run MyPY against the test files. I would prefer we don't just apply the rules for the code to the tests, because code quality is not important for the same reasons.

Steps to reproduce

N/A

Current results

No response

Sugested feature result

title

Additional information

No response