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Unified Diff: tests/lib_strong/async/stream_event_transformed_test.dart

Issue 2802973005: Migrate async tests to strong (Closed)
Patch Set: Created 3 years, 8 months ago
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Index: tests/lib_strong/async/stream_event_transformed_test.dart
diff --git a/tests/lib_strong/async/stream_event_transformed_test.dart b/tests/lib_strong/async/stream_event_transformed_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..62d1967bacd40abbc94b2557d6cdac0f52c6463c
--- /dev/null
+++ b/tests/lib_strong/async/stream_event_transformed_test.dart
@@ -0,0 +1,313 @@
+// Copyright (c) 2013, 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 'package:expect/expect.dart';
+import 'package:async_helper/async_helper.dart';
+import 'dart:async';
+import 'event_helper.dart';
+
+
+class DecrementingTransformerSink implements EventSink {
+ final outSink;
+ DecrementingTransformerSink(this.outSink);
+
+ void add(int i) => outSink.add(i - 1);
+ void addError(int e, [st]) => outSink.addError(e - 1, st);
+ void close() => outSink.close();
+}
+
+class FutureWaitingTransformerSink implements EventSink {
+ final outSink;
+ final closeFuture;
+ FutureWaitingTransformerSink(this.outSink, this.closeFuture);
+
+ void add(Future future) { future.then(outSink.add); }
+ void addError(Future e, [st]) { e.then((val) { outSink.addError(val, st); }); }
+ void close() { closeFuture.whenComplete(outSink.close); }
+}
+
+class ZoneTransformerSink implements EventSink {
+ final outSink;
+ ZoneTransformerSink(this.outSink);
+
+ void add(_) { outSink.add(Zone.current); }
+ void addError(_, [st]) { outSink.add(Zone.current); }
+ void close() {
+ outSink.add(Zone.current);
+ outSink.close();
+ }
+}
+
+class TypeChangingSink implements EventSink<int> {
+ final EventSink<String> outSink;
+ TypeChangingSink(this.outSink);
+
+ void add(int data) { outSink.add(data.toString()); }
+ void addError(error, [st]) { outSink.addError(error, st); }
+ void close() { outSink.close(); }
+}
+
+class SinkTransformer<S, T> implements StreamTransformer<S, T> {
+ final Function sinkMapper;
+ SinkTransformer(this.sinkMapper);
+
+ Stream<T> bind(Stream<S> stream) {
+ return new Stream<T>.eventTransformed(stream, sinkMapper);
+ }
+}
+
+get currentStackTrace {
+ try {
+ throw 0;
+ } catch (e, st) {
+ return st;
+ }
+}
+
+// In most cases the callback will be 'asyncEnd'. Errors are reported
+// asynchronously. We want to give them time to surface before reporting
+// asynchronous tests as done.
+void delayCycles(callback, int nbCycles) {
+ if (nbCycles == 0) {
+ callback();
+ return;
+ }
+ Timer.run(() {
+ delayCycles(callback, nbCycles - 1);
+ });
+}
+
+main() {
+ {
+ // Simple test: use the SinkTransformer (using the Stream.eventTransformed
+ // constructor) to transform a sequence of numbers. This is basically
+ // similar to a map.
+ asyncStart();
+ new Stream.fromIterable([1, 2, 3])
+ .transform(
+ new SinkTransformer((sink) => new DecrementingTransformerSink(sink)))
+ .toList()
+ .then((list) {
+ Expect.listEquals([0, 1, 2], list);
+ asyncEnd();
+ });
+ }
+
+ {
+ // Similar test as above: but this time also transform errors. Also
+ // checks that the stack trace is correctly passed through.
+ asyncStart();
+ var controller;
+ var events = [];
+ var stackTrace = currentStackTrace;
+ controller = new StreamController(onListen: () {
+ controller.add(499);
+ controller.addError(42, stackTrace);
+ controller.close();
+ });
+ controller.stream
+ .transform(
+ new SinkTransformer((sink) => new DecrementingTransformerSink(sink)))
+ .listen((data) {
+ events.add(data);
+ }, onError: (e, st) {
+ events.add(e);
+ events.add(st);
+ }, onDone: () {
+ Expect.listEquals([498, 41, stackTrace], events);
+ asyncEnd();
+ });
+ }
+
+ {
+ // Test that the output sink of the transformer can be used asynchronously.
+ asyncStart();
+ var controller;
+ var events = [];
+ var stackTrace = currentStackTrace;
+ var completer1 = new Completer();
+ var completer2 = new Completer();
+ var completer3 = new Completer();
+ var closeCompleter = new Completer();
+ controller = new StreamController(onListen: () {
+ controller.add(completer1.future);
+ controller.addError(completer2.future, stackTrace);
+ controller.add(completer3.future);
+ controller.close();
+ });
+ controller.stream
+ .transform(
+ new SinkTransformer((sink) =>
+ new FutureWaitingTransformerSink(sink, closeCompleter.future)))
+ .listen((data) {
+ events.add(data);
+ }, onError: (e, st) {
+ events.add(e);
+ events.add(st);
+ }, onDone: () {
+ Expect.listEquals(["error2", stackTrace, "future3", "future1"], events);
+ asyncEnd();
+ });
+ Timer.run(() {
+ completer2.complete("error2");
+ Timer.run(() {
+ completer3.complete("future3");
+ Timer.run(() {
+ completer1.complete("future1");
+ scheduleMicrotask(closeCompleter.complete);
+ });
+ });
+ });
+ }
+
+ {
+ // Test that the output sink of the transformer can be used asynchronously
+ // and that events are paused if necessary.
+ asyncStart();
+ var controller;
+ var events = [];
+ var stackTrace = currentStackTrace;
+ var completer1 = new Completer.sync();
+ var completer2 = new Completer.sync();
+ var completer3 = new Completer.sync();
+ var closeCompleter = new Completer();
+ controller = new StreamController(onListen: () {
+ controller.add(completer1.future);
+ controller.addError(completer2.future, stackTrace);
+ controller.add(completer3.future);
+ controller.close();
+ });
+ var subscription;
+ completer1.future.then((_) { Expect.isTrue(subscription.isPaused); });
+ completer2.future.then((_) { Expect.isTrue(subscription.isPaused); });
+ completer3.future.then((_) { Expect.isTrue(subscription.isPaused); });
+ subscription = controller.stream
+ .transform(
+ new SinkTransformer((sink) =>
+ new FutureWaitingTransformerSink(sink, closeCompleter.future)))
+ .listen((data) {
+ Expect.isFalse(subscription.isPaused);
+ events.add(data);
+ }, onError: (e, st) {
+ events.add(e);
+ events.add(st);
+ }, onDone: () {
+ Expect.listEquals(["error2", stackTrace, "future3", "future1"], events);
+ asyncEnd();
+ });
+ Timer.run(() {
+ subscription.pause();
+ completer2.complete("error2");
+ Timer.run(() {
+ subscription.resume();
+ Timer.run(() {
+ Expect.listEquals(["error2", stackTrace], events);
+ subscription.pause();
+ completer3.complete("future3");
+ Timer.run(() {
+ subscription.resume();
+ Timer.run(() {
+ Expect.listEquals(["error2", stackTrace, "future3"], events);
+ subscription.pause();
+ completer1.complete("future1");
+ subscription.resume();
+ scheduleMicrotask(closeCompleter.complete);
+ });
+ });
+ });
+ });
+ });
+ }
+
+ {
+ // Test that the output sink of the transformer reports errors when the
+ // stream is already closed.
+ asyncStart();
+ var controller;
+ var events = [];
+ var stackTrace = currentStackTrace;
+ var completer1 = new Completer();
+ var completer2 = new Completer();
+ var completer3 = new Completer();
+ var closeCompleter = new Completer();
+ controller = new StreamController(onListen: () {
+ controller.add(completer1.future);
+ controller.addError(completer2.future, stackTrace);
+ controller.add(completer3.future);
+ controller.close();
+ });
+
+ bool streamIsDone = false;
+ int errorCount = 0;
+ runZoned(() {
+ controller.stream
+ .transform(
+ new SinkTransformer((sink) =>
+ new FutureWaitingTransformerSink(sink, closeCompleter.future)))
+ .listen((data) {
+ events.add(data);
+ }, onError: (e, st) {
+ events.add(e);
+ events.add(st);
+ }, onDone: () {
+ Expect.listEquals([], events);
+ streamIsDone = true;
+ });
+ }, onError: (e) {
+ Expect.isTrue(e is StateError);
+ errorCount++;
+ });
+ closeCompleter.complete();
+ Timer.run(() {
+ Expect.isTrue(streamIsDone);
+ // Each of the delayed completions should trigger an unhandled error
+ // in the zone the stream was listened to.
+ Timer.run(() { completer1.complete(499); });
+ Timer.run(() { completer2.complete(42); });
+ Timer.run(() { completer3.complete(99); });
+ delayCycles(() {
+ Expect.equals(3, errorCount);
+ asyncEnd();
+ }, 5);
+ });
+ }
+
+ {
+ // Test that the transformer is executed in the zone it was listened to.
+ asyncStart();
+ var stackTrace = currentStackTrace;
+ var events = [];
+ var controller;
+ controller = new StreamController(onListen: () {
+ // Events are added outside the zone.
+ controller.add(499);
+ controller.addError(42, stackTrace);
+ controller.close();
+ });
+ Zone zone = Zone.current.fork();
+ var stream = controller.stream.transform(
+ new SinkTransformer((sink) => new ZoneTransformerSink(sink)));
+ zone.run(() {
+ stream.listen((data) {
+ events.add(data);
+ }, onDone: () {
+ Expect.listEquals([zone, zone, zone], events);
+ delayCycles(asyncEnd, 3);
+ });
+ });
+ }
+
+ {
+ // Just make sure that the generic types are correct everywhere.
+ asyncStart();
+ new Stream.fromIterable([1, 2, 3])
+ .transform(new SinkTransformer<int, String>(
+ (sink) => new TypeChangingSink(sink)))
+ .toList()
+ .then((list) {
+ Expect.listEquals(["1", "2", "3"], list);
+ asyncEnd();
+ });
+ }
+}
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