Macro nom_test_helpers::assert_error_and_eq

macro_rules! assert_error_and_eq {
    ($r:expr, $err:expr) => { ... };
}

This asserts that the IResult is an Error and that the error is what is expected

Examples

let r: IResult<&[u8], &[u8]> = IResult::Error(Err::Code(ErrorKind::Custom(1)));
assert_error_and_eq!(r, Err::Code(ErrorKind::Custom(1)));