assert_fn_err_gt_x

assertables

Macro assert_fn_err_gt_x 

Source 
macro_rules! assert_fn_err_gt_x {
    ($a_function:path, $a_param:expr, $b_expr:expr $(,)?) => { ... };
    ($a_function:path, $a_param:expr, $b_expr:expr, $($message:tt)+) => { ... };
    ($a_function:path, $b_expr:expr $(,)?) => { ... };
    ($a_function:path, $b_expr:expr, $($message:tt)+) => { ... };
}
Expand description

Assert a function error is greater than an expression.

Pseudocode:
(function(param) ⇒ Err(a) ⇒ a) > expr

  • If true, return a.

  • Otherwise, call panic! with a message and the values of the expressions with their debug representations.

§Examples

use assertables::*;
fn f(i: i8) -> Result<String, String> {
    match i {
        0..=9 => Ok(format!("{}", i)),
        _ => Err(format!("{:?} is out of range", i)),
    }
}

let a: i8 = 20;
let b = String::from("10 is out of range");
assert_fn_err_gt_x!(f, a, b);

// This will panic
let a: i8 = 10;
let b = String::from("20 is out of range");
assert_fn_err_gt_x!(f, a, b);
// assertion failed: `assert_fn_err_gt_x!(a_function, a_param, b_expr)`
// https://docs.rs/assertables/…/assertables/macro.assert_fn_err_gt_x.html
//  a_function label: `f`,
//     a_param label: `a`,
//     a_param debug: `10`,
//      b_expr label: `b`,
//      b_expr debug: `\"20 is out of range\"`,
//                 a: `\"10 is out of range\"`,
//                 b: `\"20 is out of range\"`

§Module macros