Macro assertables::assert_command_stderr_eq_other_as_result

macro_rules! assert_command_stderr_eq_other_as_result {
    ($a_command:expr, $b_command:expr $(,)?) => { ... };
}

Assert a command stderr string is equal to another.

• If true, return Result Ok(()).

• Otherwise, return Result Err with a diagnostic message.

Examples

use std::process::Command;

let mut a = Command::new("printf");
let mut b = Command::new("printf");
let x = assert_command_stderr_eq_other_as_result!(a, b);
//-> Ok(())
let actual = x.unwrap();
let expect = ();
assert_eq!(actual, expect);

let mut a = Command::new("printf");
let mut b = Command::new("printf");
b.arg("-v");
let x = assert_command_stderr_eq_other_as_result!(a, b);
//-> Err(…)
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_command_stderr_eq_other!(left_command, right_command)`\n",
    "  left_command label: `a`,\n",
    "  left_command debug: `\"printf\"`,\n",
    " right_command label: `b`,\n",
    " right_command debug: `\"printf\" \"-v\"`,\n",
    "                left: `\"usage: printf format [arguments ...]\\n\"`,\n",
    "               right: `\"printf: illegal option -- v\\nusage: printf format [arguments ...]\\n\"`"
);
assert_eq!(actual, expect);

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