mirror of
https://github.com/dart-lang/sdk
synced 2024-09-16 00:29:48 +00:00
b81f12a549
Change-Id: I0fa2ee2561dd0bc399d88868d790d56e6df3c94d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134940 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
196 lines
3.9 KiB
Dart
196 lines
3.9 KiB
Dart
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
import "dart:async";
|
|
import "package:expect/expect.dart";
|
|
import "package:async_helper/async_helper.dart";
|
|
|
|
main() async {
|
|
asyncStart();
|
|
// Normal operations.
|
|
{
|
|
Stream<int> f() async* {
|
|
yield 1;
|
|
yield 2;
|
|
yield 3;
|
|
}
|
|
|
|
Expect.listEquals([1, 2, 3], await f().toList(), "basic1");
|
|
}
|
|
|
|
{
|
|
Stream<int> f() async* {
|
|
yield 1;
|
|
yield 2;
|
|
yield 3;
|
|
}
|
|
|
|
var log = [];
|
|
var completer = Completer();
|
|
f().listen(log.add,
|
|
onError: (e) {
|
|
// Shouldn't be reached.
|
|
completer.complete(new Future.sync(() {
|
|
Expect.fail("$e");
|
|
}));
|
|
},
|
|
onDone: () => completer.complete(null));
|
|
await completer.future;
|
|
Expect.listEquals([1, 2, 3], log, "basic2");
|
|
}
|
|
|
|
{
|
|
var log = [];
|
|
Stream<int> f() async* {
|
|
log.add("-1");
|
|
yield 1;
|
|
log.add("-2");
|
|
yield 2;
|
|
}
|
|
|
|
await f().forEach((e) {
|
|
log.add("+$e");
|
|
});
|
|
Expect.listEquals(["-1", "+1", "-2", "+2"], log, "basic3");
|
|
}
|
|
|
|
{
|
|
var log = [];
|
|
Stream<int> f() async* {
|
|
log.add("-1");
|
|
yield 1;
|
|
log.add("-2");
|
|
yield 2;
|
|
}
|
|
|
|
await for (var e in f()) {
|
|
log.add("+$e");
|
|
}
|
|
Expect.listEquals(["-1", "+1", "-2", "+2"], log, "basic4");
|
|
}
|
|
|
|
// async
|
|
{
|
|
Stream<int> f() async* {
|
|
yield 1;
|
|
await Future(() {});
|
|
yield 2;
|
|
await Future(() {});
|
|
yield 3;
|
|
}
|
|
|
|
Expect.listEquals([1, 2, 3], await f().toList(), "async");
|
|
}
|
|
|
|
// Yield*
|
|
{
|
|
Stream<int> f(int n) async* {
|
|
yield n;
|
|
if (n == 0) return;
|
|
yield* f(n - 1);
|
|
yield n;
|
|
}
|
|
|
|
Expect.listEquals([3, 2, 1, 0, 1, 2, 3], await f(3).toList(), "yield*");
|
|
}
|
|
|
|
// Errors
|
|
{
|
|
var log = [];
|
|
Stream<int> f() async* {
|
|
yield 1;
|
|
throw "error";
|
|
}
|
|
|
|
await f().handleError((e) {
|
|
log.add(e);
|
|
}).forEach(log.add);
|
|
Expect.listEquals([1, "error"], log, "error");
|
|
}
|
|
|
|
{
|
|
var log = [];
|
|
Stream<int> f() async* {
|
|
yield 1;
|
|
yield* Future<int>.error("error").asStream(); // Emits error as error.
|
|
yield 3;
|
|
}
|
|
|
|
await f().handleError((e) {
|
|
log.add(e);
|
|
}).forEach(log.add);
|
|
Expect.listEquals([1, "error", 3], log, "error2");
|
|
}
|
|
|
|
// Pause is checked after delivering event.
|
|
{
|
|
var log = [];
|
|
Stream<int> f() async* {
|
|
log.add("-1");
|
|
yield 1;
|
|
log.add("-2");
|
|
yield 2;
|
|
}
|
|
|
|
var completer = Completer();
|
|
var s;
|
|
s = f().listen((e) {
|
|
log.add("+$e");
|
|
s.pause(Future(() {}));
|
|
log.add("++$e");
|
|
}, onError: (e) {
|
|
completer.complete(new Future.sync(() {
|
|
Expect.fail("$e");
|
|
}));
|
|
}, onDone: () => completer.complete(null));
|
|
await completer.future;
|
|
Expect.listEquals(["-1", "+1", "++1", "-2", "+2", "++2"], log, "pause");
|
|
}
|
|
|
|
// Await for-loop pauses between events.
|
|
{
|
|
var log = [];
|
|
Stream<int> f() async* {
|
|
log.add("-1");
|
|
yield 1;
|
|
log.add("-2");
|
|
yield 2;
|
|
}
|
|
|
|
await for (var e in f()) {
|
|
log.add("+$e");
|
|
await Future(() {}); // One timer tick.
|
|
log.add("++$e");
|
|
}
|
|
Expect.listEquals(["-1", "+1", "++1", "-2", "+2", "++2"], log, "looppause");
|
|
}
|
|
|
|
// Await for-loop break works immediately.
|
|
{
|
|
var log = [];
|
|
Stream<int> f() async* {
|
|
try {
|
|
log.add("-1");
|
|
yield 1;
|
|
log.add("-2");
|
|
yield 2;
|
|
log.add("-3");
|
|
yield 3;
|
|
} finally {
|
|
log.add("x");
|
|
}
|
|
}
|
|
|
|
await for (var e in f()) {
|
|
log.add("+$e");
|
|
await Future(() {}); // One timer tick, pauses function at yield.
|
|
log.add("++$e");
|
|
if (e == 2) break;
|
|
}
|
|
Expect.listEquals(
|
|
["-1", "+1", "++1", "-2", "+2", "++2", "x"], log, "loop-pause-break");
|
|
}
|
|
asyncEnd();
|
|
}
|