Macro assertables::assume_fn_ok_lt

macro_rules! assume_fn_ok_lt {
    ($function:path, $left:expr, $right:expr $(,)?) => { ... };
    ($function:path, $left:expr, $right:expr, $($arg:tt)+) => { ... };
}

Assume one function ok() is less than another function ok().

• When true, return Ok(true).

• Otherwise, return Err with a message and the values of the expressions with their debug representations.

Example

assume_fn_ok_lt!(i32::from_str, "1", "2");
//-> Ok(true)

assume_fn_ok_lt!(i32::from_str, "2", "1");
//-> Err("assumption failed: `assume_fn_ok_lt(left, right)`\n  left input: `\"2\"`\n right input: `\"1\"`\n  left output: `2`\n right output: `1`")

This macro has a second form where a custom message can be provided.