RPython is lovely. I get a fast interpreter, but I can still use the full Python toolset for unit testing (e.g. coverage with coveralls.io).
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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.
