Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/rx/Rx/NET/Source/Microsoft.Reactive.Testing/ITestObservable.cs

@@ -0,0 +1,25 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Reactive;
+
+namespace Microsoft.Reactive.Testing
+{
+    /// <summary>
+    /// Observable sequence that records subscription lifetimes and timestamped notification messages sent to observers.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements in the sequence.</typeparam>
+    public interface ITestableObservable<T> : IObservable<T>
+    {
+        /// <summary>
+        /// Gets a list of all the subscriptions to the observable sequence, including their lifetimes.
+        /// </summary>
+        IList<Subscription> Subscriptions { get; }
+
+        /// <summary>
+        /// Gets the recorded timestamped notification messages that were sent by the observable sequence to its observers.
+        /// </summary>
+        IList<Recorded<Notification<T>>> Messages { get; }
+    }
+}