88 lines
2.2 KiB
Dart
88 lines
2.2 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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void main() {
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group('SwitchLatest', () {
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test('emits all values from an emitted Stream', () {
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expect(
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Rx.switchLatest(
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Stream.value(
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Stream.fromIterable(const ['A', 'B', 'C']),
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),
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),
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emitsInOrder(<dynamic>['A', 'B', 'C', emitsDone]),
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);
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});
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test('only emits values from the latest emitted stream', () {
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expect(
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Rx.switchLatest(testStream),
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emits('C'),
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);
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});
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test('emits errors from the higher order Stream to the listener', () {
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expect(
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Rx.switchLatest(
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Stream<Stream<void>>.error(Exception()),
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),
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emitsError(isException),
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);
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});
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test('emits errors from the emitted Stream to the listener', () {
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expect(
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Rx.switchLatest(errorStream),
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emitsError(isException),
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);
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});
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test('closes after the last event from the last emitted Stream', () {
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expect(
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Rx.switchLatest(testStream),
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emitsThrough(emitsDone),
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);
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});
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test('closes if the higher order stream is empty', () {
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expect(
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Rx.switchLatest(
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Stream<Stream<void>>.empty(),
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),
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emitsThrough(emitsDone),
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);
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});
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test('is single subscription', () {
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final stream = SwitchLatestStream(testStream);
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expect(stream, emits('C'));
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expect(() => stream.listen(null), throwsStateError);
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});
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test('can be paused and resumed', () {
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// ignore: cancel_subscriptions
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final subscription =
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Rx.switchLatest(testStream).listen(expectAsync1((result) {
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expect(result, 'C');
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}));
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subscription.pause();
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subscription.resume();
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});
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});
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}
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Stream<Stream<String>> get testStream => Stream.fromIterable([
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Rx.timer('A', Duration(seconds: 2)),
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Rx.timer('B', Duration(seconds: 1)),
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Stream.value('C'),
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]);
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Stream<Stream<String>> get errorStream => Stream.fromIterable([
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Rx.timer('A', Duration(seconds: 2)),
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Rx.timer('B', Duration(seconds: 1)),
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Stream.error(Exception()),
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]);
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