Adding a test for mutable feature collection

Author: Praburaj

test/Microsoft.AspNet.Hosting.Tests/HttpContextFactoryFacts.cs

@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.AspNet.Hosting.Builder;
+using Microsoft.AspNet.Owin;
+using Xunit;
+
+namespace Microsoft.AspNet.Hosting.Tests
+{
+    public class HttpContextFactoryFacts
+    {
+        [Fact]
+        public void Mutable_FeatureCollection_Wrapped_For_OwinFeatureCollection()
+        {
+            var env = new Dictionary<string, object>();
+            var contextFactory = new HttpContextFactory();
+            var context = contextFactory.CreateHttpContext(new OwinFeatureCollection(env));
+            
+            // Setting a feature will throw if the above feature collection is not wrapped in a mutable feature collection.
+            context.SetFeature<ICustomFeature>(new CustomFeature(100));
+            Assert.Equal(100, context.GetFeature<ICustomFeature>().Value);
+        }
+
+        private interface ICustomFeature
+        {
+            int Value { get; }
+        }
+
+        private class CustomFeature : ICustomFeature
+        {
+            private readonly int _value;
+            public CustomFeature(int value)
+            {
+                _value = value;
+            }
+
+            public int Value
+            {
+                get { return _value; }
+            }
+        }
+    }
+}

test/Microsoft.AspNet.Hosting.Tests/project.json

@@ -1,14 +1,15 @@
 {
     "dependencies": {
         "Microsoft.AspNet.Hosting": "1.0.0-*",
+        "Microsoft.AspNet.Owin": "1.0.0-*",
         "Microsoft.AspNet.RequestContainer": "1.0.0-*",
         "xunit.runner.kre": "1.0.0-*"
     },
     "frameworks": {
-        "aspnet50": { }
+        "aspnet50": {}
     },
     "commands": {
         "test": "xunit.runner.kre"
     },
     "webroot": "testroot"
-}
+}