Add events in barback to bubble up the dirty bit.

pkg/barback/test/stream_pool_test.dart

+// 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.
+
+library barback.test.stream_pool_test;
+
+import 'dart:async';
+
+import 'package:barback/src/stream_pool.dart';
+import 'package:barback/src/utils.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import 'utils.dart';
+
+main() {
+  initConfig();
+
+  group("buffered", () {
+    test("buffers events from multiple inputs", () {
+      var pool = new StreamPool<String>();
+
+      var controller1 = new StreamController<String>();
+      pool.addStream(controller1.stream);
+      controller1.add("first");
+
+      var controller2 = new StreamController<String>();
+      pool.addStream(controller2.stream);
+      controller2.add("second");
+
+      // Call [toList] asynchronously to be sure that the events have been
+      // buffered beforehand and aren't just being received unbuffered.
+      expect(newFuture(() => pool.stream.toList()),
+          completion(equals(["first", "second"])));
+
+      pumpEventQueue().then((_) => pool.close());
+    });
+
+    test("buffers errors from multiple inputs", () {
+      var pool = new StreamPool<String>();
+
+      var controller1 = new StreamController<String>();
+      pool.addStream(controller1.stream);
+      controller1.add("first");
+
+      var controller2 = new StreamController<String>();
+      pool.addStream(controller2.stream);
+      controller2.add("second");
+      controller1.addError("third");
+      controller2.addError("fourth");
+      controller1.add("fifth");
+
+      expect(newFuture(() {
+        return pool.stream.transform(new StreamTransformer(
+            handleData: (data, sink) => sink.add(["data", data]),
+            handleError: (error, sink) => sink.add(["error", error]))).toList();
+      }), completion(equals([
+        ["data", "first"],
+        ["data", "second"],
+        ["error", "third"],
+        ["error", "fourth"],
+        ["data", "fifth"]
+      ])));
+
+      pumpEventQueue().then((_) => pool.close());
+    });
+
+    test("buffers inputs from a broadcast stream", () {
+      var pool = new StreamPool<String>();
+      var controller = new StreamController<String>.broadcast();
+      pool.addStream(controller.stream);
+      controller.add("first");
+      controller.add("second");
+
+      expect(newFuture(() => pool.stream.toList()),

[Bob Nystrom, 2013/08/01 18:10:33]

Copy the comment from the similar test above here.

[nweiz, 2013/08/01 20:30:52]

Done.

+          completion(equals(["first", "second"])));
+
+      pumpEventQueue().then((_) => pool.close());
+    });
+  });
+
+  group("broadcast", () {
+    test("doesn't buffer inputs", () {
+      var pool = new StreamPool<String>.broadcast();
+
+      var controller1 = new StreamController<String>.broadcast();
+      pool.addStream(controller1.stream);
+      controller1.add("first");
+
+      var controller2 = new StreamController<String>.broadcast();
+      pool.addStream(controller2.stream);
+      controller2.add("second");
+
+      // Call [toList] asynchronously to be sure that the events have been
+      // buffered beforehand and aren't just being received unbuffered.
+      expect(newFuture(() => pool.stream.toList()), completion(isEmpty));
+
+      pumpEventQueue().then((_) => pool.close());
+    });
+
+    test("doesn't buffer errors", () {
+      var pool = new StreamPool<String>.broadcast();
+
+      var controller1 = new StreamController<String>.broadcast();
+      pool.addStream(controller1.stream);
+      controller1.addError("first");
+
+      var controller2 = new StreamController<String>.broadcast();
+      pool.addStream(controller2.stream);
+      controller2.addError("second");
+
+      expect(newFuture(() {
+        return pool.stream.transform(new StreamTransformer(
+            handleData: (data, sink) => sink.add(["data", data]),
+            handleError: (error, sink) => sink.add(["error", error]))).toList();

[Bob Nystrom, 2013/08/01 18:10:33]

Since you're just checking for emptiness, there's no real reason to make little
tuples here. Could just do sink.add(error).

[nweiz, 2013/08/01 20:30:52]

Done.

+      }), completion(isEmpty));
+
+      pumpEventQueue().then((_) => pool.close());
+    });
+
+    test("doesn't buffer inputs from a buffered stream", () {
+      var pool = new StreamPool<String>.broadcast();
+      var controller = new StreamController<String>();
+      pool.addStream(controller.stream);
+      controller.add("first");
+      controller.add("second");
+
+      expect(pumpEventQueue().then((_) => pool.stream.toList()),
+          completion(isEmpty));
+
+      pumpEventQueue().then((_) => pool.close());
+    });
+  });
+
+  for (var type in ["buffered", "broadcast"]) {
+    group(type, () {
+      var pool;
+      var bufferedController;
+      var bufferedStream;
+      var bufferedSyncController;
+      var broadcastController;
+      var broadcastStream;
+      var broadcastSyncController;
+
+      setUp(() {
+        if (type == "buffered") {
+          pool = new StreamPool<String>();
+        } else {
+          pool = new StreamPool<String>.broadcast();
+        }
+
+        bufferedController = new StreamController<String>();
+        pool.addStream(bufferedController.stream);
+
+        bufferedSyncController = new StreamController<String>(sync: true);
+        pool.addStream(bufferedSyncController.stream);
+
+        broadcastController = new StreamController<String>.broadcast();
+        pool.addStream(broadcastController.stream);
+
+        broadcastSyncController =
+          new StreamController<String>.broadcast(sync: true);
+        pool.addStream(broadcastSyncController.stream);
+      });
+
+      test("emits events to a listener", () {
+        expect(pool.stream.toList(), completion(equals(["first", "second"])));
+
+        bufferedController.add("first");
+        broadcastController.add("second");
+        pumpEventQueue().then((_) => pool.close());
+      });
+
+      test("emits sync events synchronously", () {
+        var events = [];
+        pool.stream.listen(events.add);
+
+        bufferedSyncController.add("first");
+        expect(events, equals(["first"]));
+
+        broadcastSyncController.add("second");
+        expect(events, equals(["first", "second"]));
+      });
+
+      test("emits async events asynchronously", () {
+        var events = [];
+        pool.stream.listen(events.add);
+
+        bufferedController.add("first");
+        broadcastController.add("second");
+        expect(events, isEmpty);
+
+        expect(pumpEventQueue().then((_) => events),
+            completion(equals(["first", "second"])));
+      });
+
+      test("doesn't emit events from removed streams", () {
+        expect(pool.stream.toList(), completion(equals(["first", "third"])));
+
+        bufferedController.add("first");
+        expect(pumpEventQueue().then((_) {
+          pool.removeStream(bufferedController.stream);
+          bufferedController.add("second");
+        }).then((_) {
+          broadcastController.add("third");
+          return pumpEventQueue();
+        }).then((_) {
+          pool.removeStream(broadcastController.stream);
+          broadcastController.add("fourth");
+          pool.close();
+        }), completes);
+      });
+    });
+  }
+}