102 lines
2.8 KiB
Dart
102 lines
2.8 KiB
Dart
import 'dart:async';
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import 'package:angel3_reactivex/angel3_reactivex.dart';
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import 'package:test/test.dart';
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import '../utils.dart';
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Stream<int> _getStream() => Stream.fromIterable(const [1, 2, 3, 4]);
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void main() {
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test('Rx.startWith', () async {
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const expectedOutput = [5, 1, 2, 3, 4];
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var count = 0;
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_getStream().startWith(5).listen(expectAsync1((result) {
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expect(expectedOutput[count++], result);
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}, count: expectedOutput.length));
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});
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test('Rx.startWith.reusable', () async {
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final transformer = StartWithStreamTransformer<int>(5);
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const expectedOutput = [5, 1, 2, 3, 4];
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var countA = 0, countB = 0;
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_getStream().transform(transformer).listen(expectAsync1((result) {
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expect(expectedOutput[countA++], result);
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}, count: expectedOutput.length));
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_getStream().transform(transformer).listen(expectAsync1((result) {
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expect(expectedOutput[countB++], result);
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}, count: expectedOutput.length));
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});
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test('Rx.startWith.asBroadcastStream', () async {
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final stream = _getStream().asBroadcastStream().startWith(5);
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// listen twice on same stream
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stream.listen(null);
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stream.listen(null);
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// code should reach here
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await expectLater(true, true);
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});
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test('Rx.startWith.error.shouldThrow', () async {
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final streamWithError = Stream<int>.error(Exception()).startWith(5);
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streamWithError.listen(null,
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onError: expectAsync2((Exception e, StackTrace s) {
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expect(e, isException);
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}));
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});
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test('Rx.startWith.pause.resume', () async {
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const expectedOutput = [5, 1, 2, 3, 4];
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var count = 0;
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late StreamSubscription<int> subscription;
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subscription = _getStream().startWith(5).listen(expectAsync1((result) {
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expect(expectedOutput[count++], result);
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if (count == expectedOutput.length) {
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subscription.cancel();
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}
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}, count: expectedOutput.length));
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subscription.pause();
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subscription.resume();
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});
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test('Rx.startWith accidental broadcast', () async {
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final controller = StreamController<int>();
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final stream = controller.stream.startWith(1);
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stream.listen(null);
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expect(() => stream.listen(null), throwsStateError);
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controller.add(1);
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});
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test(
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'Rx.startWith broadcast stream should not startWith on multiple subscribers',
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() async {
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final controller = StreamController<int>.broadcast();
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final stream = controller.stream.startWith(1);
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await controller.close();
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stream.listen(null);
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await Future<void>.delayed(const Duration(milliseconds: 10));
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await expectLater(stream, emits(emitsDone));
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}, skip: true);
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test('Rx.startWith.nullable', () {
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nullableTest<String?>(
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(s) => s.startWith('String'),
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);
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});
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}
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