assert_ok

This crate contains a macro assert_ok which takes an expression and if the expression evaluates to an Err, panics with a useful message. If in contrast the expression evaluates to Ok(v) then it returns the value v.

This is commonly useful in tests. Instead of

let z = foo(arg1, arg2).unwrap();

or

let z = foo(arg1, arg2).expect("foo failed");

use

let z = assert_ok!(foo(arg1, arg2));

It's easier to understand (IMO) and more importantly provides a much more useful error message in the case that it fails.

There is a similar macro in Tokio, however for libraries or applications that don't use Tokio, pulling it in for a single macro doesn't make sense.

lib.rs:

A macro that asserts that a Result is [Ok]