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

/// Assert a value is not equal to another.
///
/// * When true, return `Ok(())`.
///
/// * When false, 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() {
/// assert_ne!(1, 2);
/// //-> ()
///
/// # let result = panic::catch_unwind(|| {
/// assert_ne!(1, 1);
/// //-> panic!
/// // assertion failed: `(left != right)`
/// //   left: `1`,
/// //  right: `1`
/// # });
/// # let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
/// # let expect = "assertion failed: `(left != right)`\n  left: `1`,\n right: `1`";
/// # assert_eq!(actual, expect);
/// # }
/// ```
///
/// This macro has a second form where a custom message can be provided.

// `assert_ne` macro is provided by Rust `std`.

#[cfg(test)]
mod tests {

    #[test]
    fn test_assert_ne_x_arity_2_success() {
        let a = 1;
        let b = 2;
        let x = assert_ne!(a, b);
        assert_eq!(x, ());
    }

    #[test]
    #[should_panic (expected = "assertion failed: `(left != right)`\n  left: `1`,\n right: `1`")]
    fn test_assert_ne_x_arity_2_failure() {
        let a = 1;
        let b = 1;
        assert_ne!(a, b);
    }

    #[test]
    fn test_assert_ne_x_arity_3_success() {
        let a = 1;
        let b = 2;
        let x = assert_ne!(a, b, "message");
        assert_eq!(x, ());
    }

    #[test]
    #[should_panic (expected = "message")]
    fn test_assert_ne_x_arity_3_failure() {
        let a = 1;
        let b = 1;
        assert_ne!(a, b, "message");
    }

}