Macro assertables::assert_set_subset_as_result

macro_rules! assert_set_subset_as_result {
    ($a:expr, $b:expr $(,)?) => { ... };
}

Assert a set is a subset of another.

• If true, return Result Ok(()).

• Otherwise, return Result Err with a diagnostic message.

Examples

let a = [1, 2];
let b = [1, 2, 3];
let x = assert_set_subset_as_result!(&a, &b);
//-> Ok(())
let actual = x.unwrap();
let expect = ();
assert_eq!(actual, expect);

let a = [1, 2, 3];
let b = [1, 2];
let x = assert_set_subset_as_result!(&a, &b);
//-> Err(…)
let actual = x.unwrap_err();
let expect = concat!(
    "assertion failed: `assert_set_subset!(left_set, right_set)`\n",
    "  left_set label: `&a`,\n",
    "  left_set debug: `[1, 2, 3]`,\n",
    " right_set label: `&b`,\n",
    " right_set debug: `[1, 2]`,\n",
    "            left: `{1, 2, 3}`,\n",
    "           right: `{1, 2}`"
);
assert_eq!(actual, expect);

This implementation uses [BTreeSet] to count items and sort them.