Macro assertables::assert_program_args_stderr_contains_as_result

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

Assert a command (built with program and args) stderr string contains a given containee.

• If true, return Result Ok(()).

• Otherwise, return Result Err with a diagnostic message.

This uses [std::String] method contains.

• The containee can be a &str, char, a slice of chars, or a function or closure that determines if a character contains.

Examples

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

let program = "printf";
let args: [&str; 0] = [];
let containee = "xyz";
let x = assert_program_args_stderr_contains_as_result!(&program, &args, containee);
//-> Err(…)
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_program_args_stderr_contains!(left_program, left_args, right_containee)`\n",
    "    left_program label: `&program`,\n",
    "    left_program debug: `\"printf\"`,\n",
    "       left_args label: `&args`,\n",
    "       left_args debug: `[]`,\n",
    " right_containee label: `containee`,\n",
    " right_containee debug: `\"xyz\"`,\n",
    "                  left: `\"usage: printf format [arguments ...]\\n\"`,\n",
    "                 right: `\"xyz\"`"
);
assert_eq!(actual, expect);