claym 0.6.0

Assertion macros (without dependencies)
Documentation 
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

/// Asserts that expression returns [`Pending`] variant.
///
/// [`Pending`]: core::task::Poll::Pending
#[macro_export]
macro_rules! assert_pending {
    ($cond:expr $(,)?) => {
        match $cond {
            pending @ core::task::Poll::Pending => pending,
            ready @ core::task::Poll::Ready(_) => $crate::assert_failed!(
                $crate::panicking::Msg("`Pending`"),
                $crate::panicking::Ref(&ready),
            ),
        }
    };
    ($cond:expr, $($arg:tt)+) => {
        match $cond {
            pending @ core::task::Poll::Pending => pending,
            ready @ core::task::Poll::Ready(_) => $crate::assert_failed!(
                $crate::panicking::Msg("`Pending`"),
                $crate::panicking::Ref(&ready),
                $($arg)+
            ),
        }
    };
}

/// Asserts that expression returns [`Pending`] variant.
///
/// [`Pending`]: core::task::Poll::Pending
#[macro_export]
macro_rules! debug_assert_pending {
    ($($arg:tt)*) => {
        if cfg!(debug_assertions) {
            $crate::assert_peding!($($arg)*);
        }
    }
}

#[cfg(test)]
mod tests {
    use core::task::Poll;

    #[test]
    #[should_panic(expected = "assertion failed: expected `Pending`, got `Ready(true)`")]
    fn check_assert_pending_panic() {
        let _ = assert_pending!(Poll::Ready(true));
    }

    #[test]
    #[should_panic(
        expected = "assertion failed: expected `Pending`, got `Ready(true)`\ni'm confused"
    )]
    fn check_assert_pending_panic_with_message() {
        let _ = assert_pending!(Poll::Ready(true), "i'm confused");
    }

    #[test]
    fn check_assert_pending_pass() {
        let _ = assert_pending!(Poll::<bool>::Pending);
    }
}