Write initial test for library search

Play.Tests/Play.Tests.csproj

@@ -117,6 +117,7 @@
     <Compile Include="Models\PlayApiTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ViewModels\PlayViewModel.cs" />
+    <Compile Include="ViewModels\SearchViewModel.cs" />
     <Compile Include="ViewModels\WelcomeViewModel.cs" />
   </ItemGroup>
   <ItemGroup>

Play.Tests/ViewModels/SearchViewModel.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reactive;
+using System.Reactive.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using FluentAssertions;
+using Moq;
+using Ninject;
+using Ninject.MockingKernel.Moq;
+using Play.Models;
+using ReactiveUI;
+using ReactiveUI.Routing;
+using ReactiveUI.Xaml;
+using Xunit;
+
+namespace Play.Tests.ViewModels
+{
+    public class SearchViewModelTests
+    {
+        [Fact]
+        public void PlayApiShouldBeCalledOnPerformSearch()
+        {
+            var kernel = new MoqMockingKernel();
+
+            kernel.GetMock<IPlayApi>()
+                .Setup(x => x.Search("Foo"))
+                .Returns(Observable.Return(new List<Song>() { new Song() { id = "12345" } }))
+                .Verifiable();
+
+            var fixture = kernel.Get<ISearchViewModel>();
+            fixture.PerformSearch.CanExecute(null).Should().BeFalse();
+
+            fixture.SearchQuery = "Foo";
+            fixture.PerformSearch.CanExecute(null).Should().BeTrue();
+            fixture.PerformSearch.Execute(null);
+
+            kernel.GetMock<IPlayApi>().Verify(x => x.Search("Foo"), Times.Once());
+
+            fixture.SearchResults.Count.Should().Be(1);
+            fixture.SearchResults[0].Model.id.Should().Be("12345");
+        }
+    }
+
+    public interface ISearchViewModel : IRoutableViewModel
+    {
+        string SearchQuery { get; set; }
+
+        ReactiveCollection<ISearchResultTileViewModel> SearchResults { get; }
+        ReactiveAsyncCommand PerformSearch { get; }
+    }
+
+    public interface ISearchResultTileViewModel : IReactiveNotifyPropertyChanged
+    {
+        Song Model { get; }
+
+        ReactiveCommand QueueSong { get; }
+        ReactiveCommand QueueAlbum { get; }
+        ReactiveCommand ShowSongsFromArtist { get; }
+        ReactiveCommand ShowSongsFromAlbum { get; }
+    }
+}