[essenciary]

> when using Rust, you can write a unit test function right next to the function you are testing.

I'm not sure that this is a good thing? With Julia you can also write doctests which work great, but having a separate test set as a Julia _project_ offers a lot of flexibility. For instance, we're now developing a Julia wrapper for Playwright to build end-to-end/UI tests which themselves have multiple dependencies. Having a test _project_ allows having as complex test cases as needed, with properly managed dependencies out of source. How would you handle that with an approach like Rust's?

A test project means that you can easily extend the testing capabilities of Base Julia - for Genie we use ExtendedTestSet which actually allows us to pick and run only some of the tests. Take a look at that.

I hope this helps.