Would it make sense to have assert_err_eq?

[gyzerok]

Hello and thanks for a awesome crate! 🎉

While writing my tests and using claim I've started wondering whether there should be an assert_err_eq function. It feels like I don't only want to check if my result is an error, but that it is a specific error.

Any specific reason why such macro is missing?

[Anders429]

I've also wondered about this. Several times I've wanted to use something similar to assert_ok_eq to check that an Err contains an expected value.

[Anders429]

FYI, this macro is now published in the fork @mattwilkinsonn put together: https://crates.io/crates/claims