Macro assertables::assert_program_args_stderr_matches_as_result

macro_rules! assert_program_args_stderr_matches_as_result {
    ($a_program:expr, $a_args:expr, $b_matcher:expr $(,)?) => { ... };
}

Assert a command (built with program and args) stderr string is a match to a given regex.

• If true, return Result Ok(()).

• Otherwise, return Result Err with a diagnostic message.

Examples

use regex::Regex;

let program = "printf";
let args: [&str; 0] = [];
let matcher = Regex::new(r"usage").unwrap();
let x = assert_program_args_stderr_matches_as_result!(&program, &args, matcher);
//-> Ok(())
let actual = x.unwrap();
let expect = ();
assert_eq!(actual, expect);

let program = "printf";
let args: [&str; 0] = [];
let matcher = Regex::new(r"xyz").unwrap();
let x = assert_program_args_stderr_matches_as_result!(&program, &args, matcher);
//-> Err(…)
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_program_args_stderr_matches!(left_program, right_matcher)`\n",
    "  left_program label: `&program`,\n",
    "  left_program debug: `\"printf\"`,\n",
    "     left_args label: `&args`,\n",
    "     left_args debug: `[]`,\n",
    " right_matcher label: `matcher`,\n",
    " right_matcher debug: `xyz`,\n",
    "                left: `\"usage: printf format [arguments ...]\\n\"`,\n",
    "               right: `xyz`"
);
assert_eq!(actual, expect);