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packages/async/test/subscription_stream_test.dart

Index: packages/async/test/subscription_stream_test.dart
diff --git a/packages/async/test/subscription_stream_test.dart b/packages/async/test/subscription_stream_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..03f0dddec203723465beb5679edbed44f787adc9
--- /dev/null
+++ b/packages/async/test/subscription_stream_test.dart
@@ -0,0 +1,176 @@
+// Copyright (c) 2015, 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 "dart:async";
+
+import "package:async/async.dart" show SubscriptionStream;
+import "package:test/test.dart";
+
+import "utils.dart";
+
+main() {
+  test("subscription stream of an entire subscription", () async {
+    var stream = createStream();
+    var subscription = stream.listen(null);
+    var subscriptionStream = new SubscriptionStream<int>(subscription);
+    await flushMicrotasks();
+    expect(subscriptionStream.toList(), completion([1, 2, 3, 4]));
+  });
+
+  test("subscription stream after two events", () async {
+    var stream = createStream();
+    var skips = 0;
+    var completer = new Completer();
+    var subscription;
+    subscription = stream.listen((value) {
+      ++skips;
+      expect(value, skips);
+      if (skips == 2) {
+        completer.complete(new SubscriptionStream<int>(subscription));
+      }
+    });
+    var subscriptionStream = await completer.future;
+    await flushMicrotasks();
+    expect(subscriptionStream.toList(), completion([3, 4]));
+  });
+
+  test("listening twice fails", () async {
+    var stream = createStream();
+    var sourceSubscription = stream.listen(null);
+    var subscriptionStream = new SubscriptionStream<int>(sourceSubscription);
+    var subscription = subscriptionStream.listen(null);
+    expect(() => subscriptionStream.listen(null), throws);
+    await subscription.cancel();
+  });
+
+  test("pause and cancel passed through to original stream", () async {
+    var controller = new StreamController(onCancel: () async => 42);
+    var sourceSubscription = controller.stream.listen(null);
+    var subscriptionStream = new SubscriptionStream(sourceSubscription);
+    expect(controller.isPaused, isTrue);
+    var lastEvent;
+    var subscription = subscriptionStream.listen((value) {
+      lastEvent = value;
+    });
+    controller.add(1);
+
+    await flushMicrotasks();
+    expect(lastEvent, 1);
+    expect(controller.isPaused, isFalse);
+
+    subscription.pause();
+    expect(controller.isPaused, isTrue);
+
+    subscription.resume();
+    expect(controller.isPaused, isFalse);
+
+    expect(await subscription.cancel(), 42);
+    expect(controller.hasListener, isFalse);
+  });
+
+  group("cancelOnError source:", () {
+    for (var sourceCancels in [false, true]) {
+      group("${sourceCancels ? "yes" : "no"}:", () {
+        var subscriptionStream;
+        setUp(() {
+          var source = createErrorStream();
+          var sourceSubscription = source.listen(null,
+                                                 cancelOnError: sourceCancels);
+          subscriptionStream = new SubscriptionStream<int>(sourceSubscription);
+        });
+
+        test("- subscriptionStream: no", () async {
+          var done = new Completer();
+          var events = [];
+          subscriptionStream.listen(events.add,
+                                    onError: events.add,
+                                    onDone: done.complete,
+                                    cancelOnError: false);
+          var expected = [1, 2, "To err is divine!"];
+          if (sourceCancels) {
+            var timeout = done.future.timeout(const Duration(milliseconds: 5),
+                                              onTimeout: () => true);
+            expect(await timeout, true);
+          } else {
+            expected.add(4);
+            await done.future;
+          }
+          expect(events, expected);
+        });
+
+        test("- subscriptionStream: yes", () async {
+          var completer = new Completer();
+          var events = [];
+          subscriptionStream.listen(events.add,
+                                    onError: (value) {
+                                      events.add(value);
+                                      completer.complete();
+                                    },
+                                    onDone: () => throw "should not happen",
+                                    cancelOnError: true);
+          await completer.future;
+          await flushMicrotasks();
+          expect(events, [1, 2, "To err is divine!"]);
+        });
+      });
+    }
+
+    for (var cancelOnError in [false, true]) {
+      group(cancelOnError ? "yes" : "no", () {
+        test("- no error, value goes to asFuture", () async {
+          var stream = createStream();
+          var sourceSubscription =
+              stream.listen(null, cancelOnError: cancelOnError);
+          var subscriptionStream =
+              new SubscriptionStream(sourceSubscription);
+          var subscription =
+              subscriptionStream.listen(null, cancelOnError: cancelOnError);
+          expect(subscription.asFuture(42), completion(42));
+        });
+
+        test("- error goes to asFuture", () async {
+          var stream = createErrorStream();
+          var sourceSubscription = stream.listen(null,
+                                                 cancelOnError: cancelOnError);
+          var subscriptionStream =
+              new SubscriptionStream(sourceSubscription);
+
+          var subscription =
+              subscriptionStream.listen(null, cancelOnError: cancelOnError);
+          expect(subscription.asFuture(), throws);
+        });
+      });
+    }
+  });
+}
+
+Stream<int> createStream() async* {
+  yield 1;
+  await flushMicrotasks();
+  yield 2;
+  await flushMicrotasks();
+  yield 3;
+  await flushMicrotasks();
+  yield 4;
+}
+
+Stream<int> createErrorStream() {
+  StreamController controller = new StreamController<int>();
+  () async {
+    controller.add(1);
+    await flushMicrotasks();
+    controller.add(2);
+    await flushMicrotasks();
+    controller.addError("To err is divine!");
+    await flushMicrotasks();
+    controller.add(4);
+    await flushMicrotasks();
+    controller.close();
+  }();
+  return controller.stream;
+}
+
+Stream<int> createLongStream() async* {
+  for (int i = 0; i < 200; i++) yield i;
+}