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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
use super::{const_io_error, Custom, Error, ErrorData, ErrorKind, Repr, SimpleMessage};
use crate::assert_matches::assert_matches;
use crate::error;
use crate::fmt;
use crate::mem::size_of;
use crate::sys::decode_error_kind;
use crate::sys::os::error_string;
#[test]
fn test_size() {
assert!(size_of::<Error>() <= size_of::<[usize; 2]>());
}
#[test]
fn test_debug_error() {
let code = 6;
let msg = error_string(code);
let kind = decode_error_kind(code);
let err = Error {
repr: Repr::new_custom(Box::new(Custom {
kind: ErrorKind::InvalidInput,
error: Box::new(Error { repr: super::Repr::new_os(code) }),
})),
};
let expected = format!(
"Custom {{ \
kind: InvalidInput, \
error: Os {{ \
code: {:?}, \
kind: {:?}, \
message: {:?} \
}} \
}}",
code, kind, msg
);
assert_eq!(format!("{err:?}"), expected);
}
#[test]
fn test_downcasting() {
#[derive(Debug)]
struct TestError;
impl fmt::Display for TestError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("asdf")
}
}
impl error::Error for TestError {}
// we have to call all of these UFCS style right now since method
// resolution won't implicitly drop the Send+Sync bounds
let mut err = Error::new(ErrorKind::Other, TestError);
assert!(err.get_ref().unwrap().is::<TestError>());
assert_eq!("asdf", err.get_ref().unwrap().to_string());
assert!(err.get_mut().unwrap().is::<TestError>());
let extracted = err.into_inner().unwrap();
extracted.downcast::<TestError>().unwrap();
}
#[test]
fn test_const() {
const E: Error = const_io_error!(ErrorKind::NotFound, "hello");
assert_eq!(E.kind(), ErrorKind::NotFound);
assert_eq!(E.to_string(), "hello");
assert!(format!("{E:?}").contains("\"hello\""));
assert!(format!("{E:?}").contains("NotFound"));
}
#[test]
fn test_os_packing() {
for code in -20..20 {
let e = Error::from_raw_os_error(code);
assert_eq!(e.raw_os_error(), Some(code));
assert_matches!(
e.repr.data(),
ErrorData::Os(c) if c == code,
);
}
}
#[test]
fn test_errorkind_packing() {
assert_eq!(Error::from(ErrorKind::NotFound).kind(), ErrorKind::NotFound);
assert_eq!(Error::from(ErrorKind::PermissionDenied).kind(), ErrorKind::PermissionDenied);
assert_eq!(Error::from(ErrorKind::Uncategorized).kind(), ErrorKind::Uncategorized);
// Check that the innards look like what we want.
assert_matches!(
Error::from(ErrorKind::OutOfMemory).repr.data(),
ErrorData::Simple(ErrorKind::OutOfMemory),
);
}
#[test]
fn test_simple_message_packing() {
use super::{ErrorKind::*, SimpleMessage};
macro_rules! check_simple_msg {
($err:expr, $kind:ident, $msg:literal) => {{
let e = &$err;
// Check that the public api is right.
assert_eq!(e.kind(), $kind);
assert!(format!("{e:?}").contains($msg));
// and we got what we expected
assert_matches!(
e.repr.data(),
ErrorData::SimpleMessage(SimpleMessage { kind: $kind, message: $msg })
);
}};
}
let not_static = const_io_error!(Uncategorized, "not a constant!");
check_simple_msg!(not_static, Uncategorized, "not a constant!");
const CONST: Error = const_io_error!(NotFound, "definitely a constant!");
check_simple_msg!(CONST, NotFound, "definitely a constant!");
static STATIC: Error = const_io_error!(BrokenPipe, "a constant, sort of!");
check_simple_msg!(STATIC, BrokenPipe, "a constant, sort of!");
}
#[derive(Debug, PartialEq)]
struct Bojji(bool);
impl error::Error for Bojji {}
impl fmt::Display for Bojji {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ah! {:?}", self)
}
}
#[test]
fn test_custom_error_packing() {
use super::Custom;
let test = Error::new(ErrorKind::Uncategorized, Bojji(true));
assert_matches!(
test.repr.data(),
ErrorData::Custom(Custom {
kind: ErrorKind::Uncategorized,
error,
}) if error.downcast_ref::<Bojji>().as_deref() == Some(&Bojji(true)),
);
}
#[derive(Debug)]
struct E;
impl fmt::Display for E {
fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
Ok(())
}
}
impl error::Error for E {}
#[test]
fn test_std_io_error_downcast() {
// Case 1: custom error, downcast succeeds
let io_error = Error::new(ErrorKind::Other, Bojji(true));
let e: Box<Bojji> = io_error.downcast().unwrap();
assert!(e.0);
// Case 2: custom error, downcast fails
let io_error = Error::new(ErrorKind::Other, Bojji(true));
let io_error = io_error.downcast::<E>().unwrap_err();
// ensures that the custom error is intact
assert_eq!(ErrorKind::Other, io_error.kind());
let e: Box<Bojji> = io_error.downcast().unwrap();
assert!(e.0);
// Case 3: os error
let errno = 20;
let io_error = Error::from_raw_os_error(errno);
let io_error = io_error.downcast::<E>().unwrap_err();
assert_eq!(errno, io_error.raw_os_error().unwrap());
// Case 4: simple
let kind = ErrorKind::OutOfMemory;
let io_error: Error = kind.into();
let io_error = io_error.downcast::<E>().unwrap_err();
assert_eq!(kind, io_error.kind());
// Case 5: simple message
const SIMPLE_MESSAGE: SimpleMessage =
SimpleMessage { kind: ErrorKind::Other, message: "simple message error test" };
let io_error = Error::from_static_message(&SIMPLE_MESSAGE);
let io_error = io_error.downcast::<E>().unwrap_err();
assert_eq!(SIMPLE_MESSAGE.kind, io_error.kind());
assert_eq!(SIMPLE_MESSAGE.message, format!("{io_error}"));
}
|
