faux 0.1.13

A library to mock structs
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
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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

#![allow(clippy::disallowed_names)]

pub trait MyTrait {}

#[derive(Clone, PartialEq, Debug)]
struct Entity {}
impl MyTrait for Entity {}

#[derive(Clone, PartialEq, Debug)]
struct Entity2 {}
impl MyTrait for Entity2 {}

#[faux::create]
pub struct Foo {}

#[faux::create]
pub struct Bar {}

#[faux::methods]
impl Foo {
    pub fn foo<E: MyTrait>(&self, _e: E) -> E {
        todo!()
    }
    pub fn bar<E: MyTrait, F: MyTrait>(&self, _e: E, _f: F) -> Result<E, F> {
        todo!()
    }
    pub fn baz<E>(&self, _e: E) -> E
    where
        E: MyTrait,
    {
        todo!()
    }
    pub fn qux<E>(&self)
    where
        E: MyTrait,
    {
        todo!()
    }
}

#[faux::create]
struct AsyncFoo {}
#[faux::methods]
impl AsyncFoo {
    pub async fn foo<E: MyTrait>(&self, _e: E) -> E {
        todo!()
    }
    pub async fn bar<E: MyTrait, F: MyTrait>(&self, _e: E, _f: F) -> Result<E, F> {
        todo!()
    }
    pub async fn baz<E>(&self, _e: E) -> E
    where
        E: MyTrait,
    {
        todo!()
    }
    pub async fn qux<E>(&self)
    where
        E: MyTrait,
    {
        todo!()
    }

    pub async fn qux_with_arg<E>(&self, _arg: u32) -> u32
    where
        E: MyTrait,
    {
        todo!()
    }
}

#[test]
fn generics() {
    let mut foo = Foo::faux();
    faux::when!(foo.foo).then_return(Entity {});
    assert_eq!(foo.foo(Entity {}), Entity {});

    let mut bar = Foo::faux();
    faux::when!(bar.bar).then_return(Ok::<_, Entity>(Entity {}));
    assert_eq!(bar.bar(Entity {}, Entity {}), Ok(Entity {}));

    let mut baz = Foo::faux();
    faux::when!(baz.baz).then_return(Entity {});
    assert_eq!(baz.baz(Entity {}), Entity {});

    let mut qux = Foo::faux();
    faux::when!(qux.qux::<Entity>()).then(|_| {});
    qux.qux::<Entity>();
}

#[test]
fn generic_tests_async() {
    let mut foo: AsyncFoo = AsyncFoo::faux();
    faux::when!(foo.foo).then_return(Entity {});

    let mut bar = AsyncFoo::faux();
    faux::when!(bar.bar).then_return(Ok::<_, Entity>(Entity {}));

    let mut baz = AsyncFoo::faux();
    faux::when!(baz.baz).then_return(Entity {});

    let mut qux = AsyncFoo::faux();
    faux::when!(qux.qux::<Entity>()).then(|_| {});

    let mut qux_with_arg = AsyncFoo::faux();
    faux::when!(qux_with_arg.qux_with_arg::<Entity>()).then(|_| 100);
    faux::when!(qux_with_arg.qux_with_arg::<Entity>(42)).then(|_| 84);
    faux::when!(qux_with_arg.qux_with_arg::<Entity>(43)).then(|_| 86);
    futures::executor::block_on(async {
        assert_eq!(foo.foo(Entity {}).await, Entity {});
        assert_eq!(bar.bar(Entity {}, Entity {}).await, Ok(Entity {}));
        assert_eq!(baz.baz(Entity {}).await, Entity {});
        qux.qux::<Entity>().await;
        assert_eq!(qux_with_arg.qux_with_arg::<Entity>(42).await, 84);
        assert_eq!(qux_with_arg.qux_with_arg::<Entity>(43).await, 86);
        assert_eq!(qux_with_arg.qux_with_arg::<Entity>(50).await, 100);
    });
}

#[test]
fn generic_two_different_impls() {
    let mut qux_with_arg = AsyncFoo::faux();
    faux::when!(qux_with_arg.qux_with_arg::<Entity>()).then(|_| 100);
    faux::when!(qux_with_arg.qux_with_arg::<Entity2>()).then(|_| 200);
    futures::executor::block_on(async {
        assert_eq!(qux_with_arg.qux_with_arg::<Entity>(42).await, 100);
        assert_eq!(qux_with_arg.qux_with_arg::<Entity2>(42).await, 200);
    });
}

#[test]
#[should_panic(expected = "`Foo::qux<E>` was called but never stubbed")]
fn unmocked_faux_panics_with_generic_information() {
    let foo = Foo::faux();
    foo.qux::<Entity>();
}