> I am a massive proponent of test-driven development. I got used to testing in languages like Java and JavaScript. I started writing tests in Rust as I would in any other language but found that I was writing tests couldn’t fail. Once you get to the point where your tests can run – that is, where your Rust code compiles – Rust has accounted for so many errors that many common test cases become irrelevant.

I wonder what kind of tests the author was writing? The test cases I write for my code is for weird edge cases I detect during testing, like parameter over or underflows, correctness of parsing functions, etc. Things that do fail. I don't get why you'd write tests for trivial things that can't fail.