Shower thought: often the value of tests is enabling you to make changes (they're less helpful if you never make code changes).
When deciding where to focus tests, we should probably focus on the parts with the most churn rather than the least coverage.
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Test code is total: we require it to always terminate or it's a failure! It also typically has 100% line and branch coverage.
I feel way less nervous about refactoring tests, you can always just run them.
I don't care what your project's test coverage is, but the fact that you're measuring it is a great sign.
The examples coverage in Rust is exceptionally good. It's weird how few languages include an example in their stdlib docs for sorting.
