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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
use async_stream::stream;
use futures_core::stream::{FusedStream, Stream};
use futures_util::pin_mut;
use futures_util::stream::StreamExt;
use tokio::sync::mpsc;
use tokio_test::assert_ok;
#[tokio::test]
async fn noop_stream() {
let s = stream! {};
pin_mut!(s);
while s.next().await.is_some() {
unreachable!();
}
}
#[tokio::test]
async fn empty_stream() {
let mut ran = false;
{
let r = &mut ran;
let s = stream! {
*r = true;
println!("hello world!");
};
pin_mut!(s);
while s.next().await.is_some() {
unreachable!();
}
}
assert!(ran);
}
#[tokio::test]
async fn yield_single_value() {
let s = stream! {
yield "hello";
};
let values: Vec<_> = s.collect().await;
assert_eq!(1, values.len());
assert_eq!("hello", values[0]);
}
#[tokio::test]
async fn fused() {
let s = stream! {
yield "hello";
};
pin_mut!(s);
assert!(!s.is_terminated());
assert_eq!(s.next().await, Some("hello"));
assert_eq!(s.next().await, None);
assert!(s.is_terminated());
// This should return None from now on
assert_eq!(s.next().await, None);
}
#[tokio::test]
async fn yield_multi_value() {
let s = stream! {
yield "hello";
yield "world";
yield "dizzy";
};
let values: Vec<_> = s.collect().await;
assert_eq!(3, values.len());
assert_eq!("hello", values[0]);
assert_eq!("world", values[1]);
assert_eq!("dizzy", values[2]);
}
#[tokio::test]
async fn unit_yield_in_select() {
use tokio::select;
async fn do_stuff_async() {}
let s = stream! {
select! {
_ = do_stuff_async() => yield,
else => yield,
}
};
let values: Vec<_> = s.collect().await;
assert_eq!(values.len(), 1);
}
#[tokio::test]
async fn yield_with_select() {
use tokio::select;
async fn do_stuff_async() {}
async fn more_async_work() {}
let s = stream! {
select! {
_ = do_stuff_async() => yield "hey",
_ = more_async_work() => yield "hey",
else => yield "hey",
}
};
let values: Vec<_> = s.collect().await;
assert_eq!(values, vec!["hey"]);
}
#[tokio::test]
async fn return_stream() {
fn build_stream() -> impl Stream<Item = u32> {
stream! {
yield 1;
yield 2;
yield 3;
}
}
let s = build_stream();
let values: Vec<_> = s.collect().await;
assert_eq!(3, values.len());
assert_eq!(1, values[0]);
assert_eq!(2, values[1]);
assert_eq!(3, values[2]);
}
#[tokio::test]
async fn consume_channel() {
let (tx, mut rx) = mpsc::channel(10);
let s = stream! {
while let Some(v) = rx.recv().await {
yield v;
}
};
pin_mut!(s);
for i in 0..3 {
assert_ok!(tx.send(i).await);
assert_eq!(Some(i), s.next().await);
}
drop(tx);
assert_eq!(None, s.next().await);
}
#[tokio::test]
async fn borrow_self() {
struct Data(String);
impl Data {
fn stream<'a>(&'a self) -> impl Stream<Item = &str> + 'a {
stream! {
yield &self.0[..];
}
}
}
let data = Data("hello".to_string());
let s = data.stream();
pin_mut!(s);
assert_eq!(Some("hello"), s.next().await);
}
#[tokio::test]
async fn stream_in_stream() {
let s = stream! {
let s = stream! {
for i in 0..3 {
yield i;
}
};
pin_mut!(s);
while let Some(v) = s.next().await {
yield v;
}
};
let values: Vec<_> = s.collect().await;
assert_eq!(3, values.len());
}
#[tokio::test]
async fn yield_non_unpin_value() {
let s: Vec<_> = stream! {
for i in 0..3 {
yield async move { i };
}
}
.buffered(1)
.collect()
.await;
assert_eq!(s, vec![0, 1, 2]);
}
#[test]
fn inner_try_stream() {
use async_stream::try_stream;
use tokio::select;
async fn do_stuff_async() {}
let _ = stream! {
select! {
_ = do_stuff_async() => {
let another_s = try_stream! {
yield;
};
let _: Result<(), ()> = Box::pin(another_s).next().await.unwrap();
},
else => {},
}
yield
};
}
#[rustversion::attr(not(stable), ignore)]
#[test]
fn test() {
let t = trybuild::TestCases::new();
t.compile_fail("tests/ui/*.rs");
}
|
