1 files changed, 60 insertions, 0 deletions
diff --git a/Rx.NET/Microsoft.Reactive.Testing/ColdObservable.cs b/Rx.NET/Microsoft.Reactive.Testing/ColdObservable.cs
new file mode 100644
index 0000000..ce18051
--- /dev/null
+++ b/Rx.NET/Microsoft.Reactive.Testing/ColdObservable.cs
@@ -0,0 +1,60 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.Reactive;
+using System;
+using System.Reactive.Disposables;
+
+namespace Microsoft.Reactive.Testing
+{
+    class ColdObservable<T> : ITestableObservable<T>
+    {
+        readonly TestScheduler scheduler;
+        readonly Recorded<Notification<T>>[] messages;
+        readonly List<Subscription> subscriptions = new List<Subscription>();
+
+        public ColdObservable(TestScheduler scheduler, params Recorded<Notification<T>>[] messages)
+        {
+            if (scheduler == null)
+                throw new ArgumentNullException("scheduler");
+            if (messages == null)
+                throw new ArgumentNullException("messages");
+
+            this.scheduler = scheduler;
+            this.messages = messages;
+        }
+
+        public virtual IDisposable Subscribe(IObserver<T> observer)
+        {
+            if (observer == null)
+                throw new ArgumentNullException("observer");
+
+            subscriptions.Add(new Subscription(scheduler.Clock));
+            var index = subscriptions.Count - 1;
+
+            var d = new CompositeDisposable();
+
+            for (var i = 0; i < messages.Length; ++i)
+            {
+                var notification = messages[i].Value;
+                d.Add(scheduler.ScheduleRelative(default(object), messages[i].Time, (scheduler1, state1) => { notification.Accept(observer); return Disposable.Empty; }));
+            }
+
+            return Disposable.Create(() =>
+            {
+                subscriptions[index] = new Subscription(subscriptions[index].Subscribe, scheduler.Clock);
+                d.Dispose();
+            });
+        }
+
+        public IList<Subscription> Subscriptions
+        {
+            get { return subscriptions; }
+        }
+
+        public IList<Recorded<Notification<T>>> Messages
+        {
+            get { return messages; }
+        }
+    }
+}