1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118

/// Assert a bag is not equal to another.
///
/// * When true, return `()`.
///
/// * Otherwise, call [`panic!`] with a message and the values of the
///   expressions with their debug representations.
///
/// # Examples
///
/// ```rust
/// # #[macro_use] extern crate assertables;
/// # use std::panic;
/// # fn main() {
/// let a = [1, 1];
/// let b = [1, 1, 1];
/// assert_bag_ne!(&a, &b);
/// //-> ()
///
/// # let result = panic::catch_unwind(|| {
/// let a = [1, 1];
/// let b = [1, 1];
/// assert_bag_ne!(&a, &b);
/// //-> panic!("…")
/// // assertion failed: `assert_bag_ne!(left, right)`
/// //   left: `[1, 1]`,
/// //  right: `[1, 1]`
/// # });
/// # let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
/// # let expect = "assertion failed: `assert_bag_ne!(left, right)`\n  left: `[1, 1]`,\n right: `[1, 1]`";
/// # assert_eq!(actual, expect);
/// # }
/// ```
///
/// This macro has a second form where a custom message can be provided.
///
/// This implementation uses [`HashMap`] to count items.
#[macro_export]
macro_rules! assert_bag_ne {
    ($left:expr, $right:expr $(,)?) => ({
        match (&$left, &$right) {
            (left_val, right_val) => {
                let mut left_bag: ::std::collections::HashMap<_, usize> = ::std::collections::HashMap::new();
                let mut right_bag: ::std::collections::HashMap<_, usize> = ::std::collections::HashMap::new();
                for x in left_val.into_iter() {
                    let n = left_bag.entry(x).or_insert(0);
                    *n += 1;
                }
                for x in right_val.into_iter() {
                    let n = right_bag.entry(x).or_insert(0);
                    *n += 1;
                }
                if left_bag != right_bag {
                    ()
                } else {
                    panic!("assertion failed: `assert_bag_ne!(left, right)`\n  left: `{:?}`,\n right: `{:?}`", $left, $right)
                }
            }
        }
    });
    ($left:expr, $right:expr, $($arg:tt)+) => ({
        match (&($left), &($right)) {
            (left_val, right_val) => {
                let mut left_bag: ::std::collections::HashMap<_, usize> = ::std::collections::HashMap::new();
                let mut right_bag: ::std::collections::HashMap<_, usize> = ::std::collections::HashMap::new();
                for x in left_val.into_iter() {
                    let n = left_bag.entry(x).or_insert(0);
                    *n += 1;
                }
                for x in right_val.into_iter() {
                    let n = right_bag.entry(x).or_insert(0);
                    *n += 1;
                }
                if left_bag != right_bag {
                    ()
                } else {
                    panic!("{:?}", $($arg)+)
                }
            }
        }
    });
}

#[cfg(test)]
mod tests {

    #[test]
    fn test_assert_bag_ne_x_arity_2_success() {
        let a = [1, 1];
        let b = [1, 1, 1];
        let x = assert_bag_ne!(&a, &b);
        assert_eq!(x, ());
    }

    #[test]
    #[should_panic (expected = "assertion failed: `assert_bag_ne!(left, right)`\n  left: `[1, 1]`,\n right: `[1, 1]`")]
    fn test_assert_bag_ne_x_arity_2_failure() {
        let a = [1, 1];
        let b = [1, 1];
        let _x = assert_bag_ne!(&a, &b);
    }

    #[test]
    fn test_assert_bag_ne_x_arity_3_success() {
        let a = [1, 1];
        let b = [1, 1, 1];
        let x = assert_bag_ne!(&a, &b, "message");
        assert_eq!(x, ());
    }

    #[test]
    #[should_panic (expected = "message")]
    fn test_assert_bag_ne_x_arity_3_failure() {
        let a = [1, 1];
        let b = [1, 1];
        let _x = assert_bag_ne!(&a, &b, "message");
    }

}