blob: bc733766022091766c63e47c0a18cb8074eb5355 [file] [log] [blame]
// Copyright (c) 2019, 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.
// @dart = 2.9
import 'dart:async';
import "package:expect/expect.dart";
import "package:async_helper/async_helper.dart";
void main() async {
var stack = StackTrace.fromString("some stack trace");
var error = MyError();
asyncStart();
{
// There is an error before any element.
var stream = Stream<int>.error(error, stack);
try {
await stream.first;
Expect.fail("didn't throw");
} on MyError catch (e, s) {
Expect.identical(error, e);
Expect.identical(stack, s);
}
}
{
// There is an error before any element.
var stream = Stream<int>.error(error, stack);
try {
await for (var _ in stream) {}
Expect.fail("didn't throw");
} on MyError catch (e, s) {
Expect.identical(error, e);
Expect.identical(stack, s);
}
}
{
// There is no second element or error.
var stream = Stream<int>.error(error, stack);
int errorCount = 0;
var noErrorStream = stream.handleError((e, s) {
Expect.identical(error, e);
Expect.identical(stack, s);
errorCount++;
}, test: (o) => o is MyError);
Expect.isTrue(await noErrorStream.isEmpty);
Expect.equals(1, errorCount);
}
{
// Works with subscriptions and pause-resume.
var stream = Stream<int>.error(error, stack);
int errorCount = 0;
var onDone = Completer();
var sub = stream.listen((v) {
Expect.fail("Value event");
}, onError: (e, s) {
Expect.identical(error, e);
Expect.identical(stack, s);
errorCount++;
}, onDone: () {
Expect.equals(1, errorCount);
onDone.complete();
});
sub.pause();
await Future.delayed(Duration(milliseconds: 10));
Expect.equals(0, errorCount);
Expect.isFalse(onDone.isCompleted);
sub.resume();
await onDone.future;
}
// A null error argument is a synchronous error.
Expect.throwsTypeError(() {
Stream.error(null);
});
asyncEnd();
}
class MyError {}