xpct 0.5.1

An extensible test assertion library
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

use std::convert::Infallible;
use std::marker::PhantomData;

use crate::core::{MatchOutcome, TransformMatch};

use super::Expectation;

/// The matcher for [`be_some`] and [`be_none`].
///
/// [`be_some`]: crate::be_some
/// [`be_none`]: crate::be_none
#[derive(Debug, Default)]
pub struct BeSomeMatcher<T> {
    marker: PhantomData<T>,
}

impl<T> BeSomeMatcher<T> {
    /// Create a new [`BeSomeMatcher`].
    pub fn new() -> Self {
        Self {
            marker: PhantomData,
        }
    }
}

impl<T> TransformMatch for BeSomeMatcher<T> {
    type In = Option<T>;

    type PosOut = T;
    type NegOut = Option<Infallible>;

    type PosFail = Expectation<Option<T>>;
    type NegFail = Expectation<Option<T>>;

    fn match_pos(
        self,
        actual: Self::In,
    ) -> crate::Result<MatchOutcome<Self::PosOut, Self::PosFail>> {
        match actual {
            Some(value) => Ok(MatchOutcome::Success(value)),
            None => Ok(MatchOutcome::Fail(Expectation { actual: None })),
        }
    }

    fn match_neg(
        self,
        actual: Self::In,
    ) -> crate::Result<MatchOutcome<Self::NegOut, Self::NegFail>> {
        match actual {
            Some(value) => Ok(MatchOutcome::Fail(Expectation {
                actual: Some(value),
            })),
            None => Ok(MatchOutcome::Success(None)),
        }
    }
}