platform/sandbox/reactivex/test/streams/never_test.dart
2024-11-12 01:00:05 -07:00

67 lines
2 KiB
Dart

import 'dart:async';
import 'package:angel3_reactivex/angel3_reactivex.dart';
import 'package:test/test.dart';
void main() {
test('NeverStream', () async {
var onDataCalled = false, onDoneCalled = false, onErrorCalled = false;
final stream = NeverStream<Never>();
final subscription = stream.listen(
expectAsync1((_) {
onDataCalled = true;
}, count: 0),
onError: expectAsync2((Exception e, StackTrace s) {
onErrorCalled = false;
}, count: 0),
onDone: expectAsync0(() {
onDataCalled = true;
}, count: 0));
await Future<void>.delayed(Duration(milliseconds: 10));
await subscription.cancel();
// We do not expect onData, onDone, nor onError to be called, as [never]
// streams emit no items or errors, and they do not terminate
await expectLater(onDataCalled, isFalse);
await expectLater(onDoneCalled, isFalse);
await expectLater(onErrorCalled, isFalse);
});
test('NeverStream.single.subscription', () async {
final stream = NeverStream<void>();
stream.listen(null);
await expectLater(() => stream.listen(null), throwsA(isStateError));
});
test('Rx.never', () async {
var onDataCalled = false, onDoneCalled = false, onErrorCalled = false;
final stream = Rx.never<Never>();
final subscription = stream.listen(
expectAsync1((_) {
onDataCalled = true;
}, count: 0),
onError: expectAsync2((Exception e, StackTrace s) {
onErrorCalled = false;
}, count: 0),
onDone: expectAsync0(() {
onDataCalled = true;
}, count: 0));
await Future<void>.delayed(Duration(milliseconds: 10));
await subscription.cancel();
// We do not expect onData, onDone, nor onError to be called, as [never]
// streams emit no items or errors, and they do not terminate
await expectLater(onDataCalled, isFalse);
await expectLater(onDoneCalled, isFalse);
await expectLater(onErrorCalled, isFalse);
});
}