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.