Add unit test project.

Author: CXuesong

AsyncEnumerableExtensions.sln

@@ -5,6 +5,8 @@ VisualStudioVersion = 15.0.26730.16
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AsyncEnumerableExtensions", "AsyncEnumerableExtensions\AsyncEnumerableExtensions.csproj", "{F1E0806C-E78D-48E9-8C61-EAE3CB18B6F2}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UnitTestProject1", "UnitTestProject1\UnitTestProject1.csproj", "{F783E085-5C68-405B-826B-6E24D362A67A}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{F1E0806C-E78D-48E9-8C61-EAE3CB18B6F2}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F1E0806C-E78D-48E9-8C61-EAE3CB18B6F2}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F1E0806C-E78D-48E9-8C61-EAE3CB18B6F2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F783E085-5C68-405B-826B-6E24D362A67A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F783E085-5C68-405B-826B-6E24D362A67A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F783E085-5C68-405B-826B-6E24D362A67A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F783E085-5C68-405B-826B-6E24D362A67A}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

UnitTestProject1/UnitTest1.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using AsyncEnumerableExtensions;
+using Xunit;
+
+namespace UnitTestProject1
+{
+    public class UnitTest1
+    {
+        [Fact]
+        public async void Test1()
+        {
+            async Task Generator(IAsyncEnumerableSink<int> sink)
+            {
+                await sink.Yield(10);
+                await sink.Yield(20);
+                await Task.Delay(100);
+                await sink.Yield(30);
+                await sink.Yield(40);
+                await Task.Delay(100);
+                await sink.Yield(50);
+            }
+
+            Assert.Equal(new[] {10, 20, 30, 40, 50},
+                await AsyncEnumerableFactory.FromAsyncGenerator<int>(Generator).ToArray());
+        }
+    }
+}

UnitTestProject1/UnitTestProject1.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0-preview-20170628-02" />
+    <PackageReference Include="xunit" Version="2.2.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AsyncEnumerableExtensions\AsyncEnumerableExtensions.csproj" />
+  </ItemGroup>
+
+</Project>