ViewComponents should render partial views

Fixes #960

src/Microsoft.AspNet.Mvc.Core/ViewComponents/ViewViewComponentResult.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
 using System.Globalization;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Core;
@@ -77,7 +76,7 @@ public async Task ExecuteAsync([NotNull] ViewComponentContext context)
 
         private IView FindView(ActionContext context, string viewName)
         {
-            var result = _viewEngine.FindView(context, viewName);
+            var result = _viewEngine.FindPartialView(context, viewName);
             if (!result.Success)
             {
                 var locations = string.Empty;

test/Microsoft.AspNet.Mvc.Core.Test/ViewComponents/ViewViewComponentResultTest.cs

@@ -0,0 +1,70 @@
+// 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;
+using System.IO;
+using System.Reflection;
+using System.Threading.Tasks;
+using Microsoft.AspNet.Mvc.ModelBinding;
+using Microsoft.AspNet.Mvc.Rendering;
+using Microsoft.AspNet.PipelineCore;
+using Microsoft.AspNet.Routing;
+using Moq;
+using Xunit;
+
+namespace Microsoft.AspNet.Mvc
+{
+    public class ViewViewComponentResultTest
+    {
+        [Fact]
+        public async Task ExecuteAsync_RendersPartialViews()
+        {
+            // Arrange
+            var view = Mock.Of<IView>();
+            var viewEngine = new Mock<IViewEngine>(MockBehavior.Strict);
+            viewEngine.Setup(e => e.FindPartialView(It.IsAny<ActionContext>(), It.IsAny<string>()))
+                      .Returns(ViewEngineResult.Found("some-view", view))
+                      .Verifiable();
+            var viewData = new ViewDataDictionary(new EmptyModelMetadataProvider());
+            var result = new ViewViewComponentResult(viewEngine.Object, "some-view", viewData);
+            var viewComponentContext = GetViewComponentContext(view, viewData);
+
+            // Act
+            await result.ExecuteAsync(viewComponentContext);
+
+            // Assert
+            viewEngine.Verify();
+        }
+
+        [Fact]
+        public async Task ExecuteAsync_ThrowsIfPartialViewCannotBeFound()
+        {
+            // Arrange
+            var expected =
+@"The view 'Components/Object/some-view' was not found. The following locations were searched:
+foo
+bar.";
+            var view = Mock.Of<IView>();
+            var viewEngine = new Mock<IViewEngine>(MockBehavior.Strict);
+            viewEngine.Setup(e => e.FindPartialView(It.IsAny<ActionContext>(), It.IsAny<string>()))
+                      .Returns(ViewEngineResult.NotFound("some-view", new[] { "foo", "bar" }))
+                      .Verifiable();
+            var viewData = new ViewDataDictionary(new EmptyModelMetadataProvider());
+            var result = new ViewViewComponentResult(viewEngine.Object, "some-view", viewData);
+            var viewComponentContext = GetViewComponentContext(view, viewData);
+
+            // Act and Assert
+            var ex = await Assert.ThrowsAsync<InvalidOperationException>(
+                        async () => await result.ExecuteAsync(viewComponentContext));
+            Assert.Equal(expected, ex.Message);
+        }
+
+        private static ViewComponentContext GetViewComponentContext(IView view, ViewDataDictionary viewData)
+        {
+            var actionContext = new ActionContext(new RouteContext(new DefaultHttpContext()), new ActionDescriptor());
+            var viewContext = new ViewContext(actionContext, view, viewData, TextWriter.Null);
+            var viewComponentContext = new ViewComponentContext(typeof(object).GetTypeInfo(), viewContext, TextWriter.Null);
+            return viewComponentContext;
+        }
+    }
+}