Build-Time Hello World Performance Test (#2681)

Hello world build performance benchmark.

test/Performance/HelloWorld.cs

@@ -0,0 +1,92 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using Microsoft.DotNet.Tools.Test.Utilities;
+using Microsoft.Extensions.PlatformAbstractions;
+using Microsoft.Xunit.Performance;
+using Xunit;
+using System.Diagnostics;
+
+namespace Microsoft.DotNet.Tests.Performance
+{
+    public class HelloWorld : TestBase
+    {
+        private static readonly string s_testdirName = "helloworldtestroot";
+        private static readonly string s_outputdirName = "test space/bin";
+
+        private static string AssetsRoot { get; set; }
+        private static string RestoredTestProjectDirectory { get; set; }
+
+        private string TestDirectory { get; set; }
+        private string TestProject { get; set; }
+        private string OutputDirectory { get; set; }
+
+        static HelloWorld()
+        {
+            HelloWorld.SetupStaticTestProject();
+        }
+
+        public HelloWorld()
+        {
+        }
+
+        [Benchmark]
+        public void MeasureDotNetBuild()
+        {
+            foreach (var iter in Benchmark.Iterations)
+            {
+                // Setup a new instance of the test project.
+                TestInstanceSetup();
+
+                // Setup the build command.
+                var buildCommand = new BuildCommand(TestProject, output: OutputDirectory, framework: DefaultFramework);
+                using (iter.StartMeasurement())
+                {
+                    // Execute the build command.
+                    buildCommand.Execute();
+                }
+            }
+        }
+
+        private void TestInstanceSetup()
+        {
+            var root = Temp.CreateDirectory();
+
+            var testInstanceDir = root.CopyDirectory(RestoredTestProjectDirectory);
+
+            TestDirectory = testInstanceDir.Path;
+            TestProject = Path.Combine(TestDirectory, "project.json");
+            OutputDirectory = Path.Combine(TestDirectory, s_outputdirName);
+        }
+
+        private static void SetupStaticTestProject()
+        {
+            AssetsRoot = Path.Combine(AppContext.BaseDirectory, "bin");
+            RestoredTestProjectDirectory = Path.Combine(AssetsRoot, s_testdirName);
+
+            // Ignore Delete Failure
+            try
+            {
+                Directory.Delete(RestoredTestProjectDirectory, true);
+            }
+            catch (Exception) { }
+
+            Directory.CreateDirectory(RestoredTestProjectDirectory);
+
+            // Todo: this is a hack until corefx is on nuget.org remove this After RC 2 Release
+            NuGetConfig.Write(RestoredTestProjectDirectory);
+
+            var newCommand = new NewCommand();
+            newCommand.WorkingDirectory = RestoredTestProjectDirectory;
+            newCommand.Execute().Should().Pass();
+
+            var restoreCommand = new RestoreCommand();
+            restoreCommand.WorkingDirectory = RestoredTestProjectDirectory;
+            restoreCommand.Execute("--quiet").Should().Pass();
+        }
+    }
+}