Module assertables::assert_fn_err

Assert macros for comparing functions that return errors.

These macros help compare functions that return results that are errors, such as std::Result::Err or similar.

The macros use these capabilities:

• implements .is_err() -> boolean

• implements .unwrap_err() -> comparable

Compare a function Err() with another function Err():

• assert_fn_err_eq!(function1, function2) ≈ function1().unwrap_err() = function2().unwrap_err()

• assert_fn_err_ne!(function1, function2) ≈ function1().unwrap_err() ≠ function2().unwrap_err()

• assert_fn_err_ge!(function1, function2) ≈ function1().unwrap_err() ≥ function2().unwrap_err()

• assert_fn_err_gt!(function1, function2) ≈ function1().unwrap_err() > function2().unwrap_err()

• assert_fn_err_le!(function1, function2) ≈ function1().unwrap_err() ≤ function2().unwrap_err()

• assert_fn_err_lt!(function1, function2) ≈ function1().unwrap_err() < function2().unwrap_err()

Compare a function Err() with an expression:

• assert_fn_err_eq!(function, expr) ≈ function().unwrap_err() = expr

• assert_fn_err_ne!(function, expr) ≈ function().unwrap_err() ≠ expr

• assert_fn_err_ge!(function, expr) ≈ function().unwrap_err() ≥ expr

• assert_fn_err_gt!(function, expr) ≈ function().unwrap_err() > expr

• assert_fn_err_le!(function, expr) ≈ function().unwrap_err() ≤ expr

• assert_fn_err_lt!(function, expr) ≈ function().unwrap_err() < expr

Example

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

let a: i8 = 10;
let b: i8 = 10;
assert_fn_err_eq!(f, a, f, b);

Modules

• assert_fn_err_eq
  Assert a function err() is equal to another.
• assert_fn_err_eq_expr
  Assert a function err() is equal to an expression.
• assert_fn_err_ge
  Assert a function err() is greater than or equal to another.
• assert_fn_err_ge_expr
  Assert a function err() is greater than or equal to an expression.
• assert_fn_err_gt
  Assert a function err() is greater than another.
• assert_fn_err_gt_expr
  Assert a function err() is greater than an expression.
• assert_fn_err_le
  Assert a function err() is less than or equal to another.
• assert_fn_err_le_expr
  Assert a function err() is less than or equal to an expression.
• assert_fn_err_lt
  Assert a function err() is less than another.
• assert_fn_err_lt_expr
  Assert a function err() is less than an expression.
• assert_fn_err_ne
  Assert a function err() is not equal to another.
• assert_fn_err_ne_expr
  Assert a function err() is not equal to an expression.