@include test-module('_functions') {
    $map: (
        'a': 'a',
        'b': _identity,
        'c': hsla,
        'd': 'floor',
        'e': 123
    );

    @include test('should return the function names of a map') {
        @include assert-equal(_functions($map), 'b' 'c' 'd');
    }

    @include test('should be aliased') {
        @include assert-equal(_methods($map), _functions($map));
    }
}