Add test coverage

[pvandyken]

As per the title!

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[codecov-commenter]

Welcome to Codecov 🎉

Once merged to your default branch, Codecov will compare your coverage reports and display the results in this comment.

Thanks for integrating Codecov - We've got you covered ☂️

[kaitj]

This one largely looks good to me - I am wondering if there is a benefit to setting a minimum target vs having it set to auto. Something we can revisit in the future too.

[pvandyken]

This one largely looks good to me - I am wondering if there is a benefit to setting a minimum target vs having it set to auto. Something we can revisit in the future too.

I know the current coverage is above 90%, which I'm fine with. Auto will make sure we don't go below that (it just ensures coverage never decreases). A limit would let the coverage decrease so long as it never goes below the limit. So if maintaining test coverage will be too much of a burden with future PRs, a threshold might be better, but I would say snakebids is at a maturity point where every new feature should be tested.