erratic 0.11.1

Handling errors in an efficient way.
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

mod common;

use common::{TestError, TestMessage, TestState};
use erratic::{nae::Nae, *};
use std::{mem, result};

#[test]
fn from_error_round_trip() {
    let err = mkerr!(error = TestError("oops")).stateless();
    let (context, payload, source) = err.into_parts::<TestMessage, TestError>();
    assert!(matches!(source, Some(TestError("oops"))));
    assert!(payload.is_none());
    assert!(context.is_none());
}

#[test]
fn builder_with_error_builds_correctly() {
    let err = mkerr!(
        error = TestError("oops"),
        context = "context",
        payload = TestMessage("payload"),
    )
    .stateless();
    let (context, payload, source) = err.into_parts::<TestMessage, TestError>();
    assert!(matches!(context, Some("context")));
    assert!(matches!(source, Some(TestError("oops"))));
    assert!(matches!(payload, Some(TestMessage("payload"))));
}

#[test]
fn downcast_source_ok() {
    let err = mkerr!(error = TestError("oops")).stateless();
    assert!(err.has_source_of::<TestError>());
    assert_eq!(err.downcast_source_ref::<TestError>().unwrap().0, "oops");
}

#[test]
fn downcast_source_wrong_type() {
    let err = mkerr!(error = TestError("oops")).stateless();
    assert!(!err.has_source_of::<Nae>());
}

#[test]
fn erase_makes_opaque() {
    let err = mkerr!(error = TestError("oops")).stateless();
    assert_eq!(format!("{}", err.erase()), "oops");
}

#[test]
fn erase_ref_lifetime() {
    let err = mkerr!(error = TestError("oops")).stateless();
    let opaque: &(dyn std::error::Error + Send + Sync + 'static) = err.erase_ref();
    assert_eq!(format!("{opaque}"), "oops");
}

#[test]
fn into_source_returns_boxed_source() {
    let err = mkerr!(error = TestError("oops")).stateless();
    assert_eq!(err.into_source().unwrap().to_string(), "oops");
}

#[test]
fn into_source_const_is_none() {
    let err = mkerr!(context = "test").stateless();
    assert!(err.into_source().is_none());
}

#[test]
fn chain_wraps_source() {
    let inner = mkerr!(error = TestError("inner")).stateless();
    let outer = mkerr!(error = inner.erase()).stateless();
    let mut chain = outer.chain();
    assert_eq!(chain.next().unwrap().to_string(), "inner");
    assert!(chain.next().is_none());
}

#[test]
fn from_std_error_via_into() {
    let io_err = std::io::Error::new(std::io::ErrorKind::NotFound, "file missing");
    let err: Error = io_err.into();
    assert!(err.into_source().is_some());
}

#[test]
fn from_same_type_id_does_not_double_wrap() {
    let inner = mkerr!(error = TestError("inner")).stateless();
    let outer: Error = inner.erase().into();
    assert_eq!(outer.into_source().unwrap().to_string(), "inner");
}

#[test]
fn error_is_one_usize() {
    assert_eq!(mem::size_of::<Error>(), mem::size_of::<usize>());
    assert_eq!(mem::size_of::<Error<TestState>>(), mem::size_of::<usize>());
}

#[test]
fn error_is_send_sync() {
    fn assert_send<T: Send>() {}
    fn assert_sync<T: Sync>() {}
    assert_send::<Error>();
    assert_sync::<Error>();
    assert_send::<Error<TestState>>();
    assert_sync::<Error<TestState>>();
}

#[test]
fn into_boxed_error() {
    let err = mkerr!(error = TestError("oops")).stateless();
    let boxed: Box<dyn std::error::Error + Send + Sync + 'static> = err.into();
    assert_eq!(format!("{boxed}"), "oops");
}

#[test]
fn wrap_self() {
    let _: Error = mkerr!(context = "while testing wrap_self");
    let _: Error = mkerr!(context = "while testing wrap_self");
    let _: Error = mkerr!(
        error = mkerr!(context = "while testing wrap_self").stateless(),
        context = "while testing wrap_self with nested error",
    );
}

#[test]
fn extract_state() -> Result<()> {
    let re: result::Result<(), _> = mkres!(state = 12);
    let re = re.extract_state()?;
    match re.unwrap_err() {
        (12, ..) => Ok(()),
        _ => unreachable!(),
    }
}