Add dotnet msbuild tests.

test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/MSBuildCommand.cs

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+// 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 Microsoft.DotNet.Cli.Utils;
+
+namespace Microsoft.DotNet.Tools.Test.Utilities
+{
+    public sealed class MSBuildCommand : TestCommand
+    {
+        public MSBuildCommand()
+            : base("dotnet")
+        {
+        }
+
+        public override CommandResult Execute(string args = "")
+        {
+            args = $"msbuild {args}";
+            return base.Execute(args);
+        }
+
+        public override CommandResult ExecuteWithCapturedOutput(string args = "")
+        {
+            args = $"msbuild {args}";
+            return base.ExecuteWithCapturedOutput(args);
+        }
+    }
+}

test/dotnet-msbuild.Tests/GivenDotnetMSBuildBuildsProjects.cs

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+// 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 FluentAssertions;
+using Microsoft.DotNet.Tools.Test.Utilities;
+using Xunit;
+
+namespace Microsoft.DotNet.Cli.Build3.Tests
+{
+    public class GivenDotnetMSBuildBuildsProjects : TestBase
+    {
+        [Fact]
+        public void ItRunsSpecifiedTargetsWithPropertiesCorrectly()
+        {
+            var testInstance = TestAssetsManager
+                .CreateTestInstance("MSBuildBareBonesProject");
+
+            var testProjectDirectory = testInstance.TestRoot;
+
+            new MSBuildCommand()
+                .WithWorkingDirectory(testProjectDirectory)
+                .ExecuteWithCapturedOutput("/t:SayHello")
+                .Should()
+                .Pass()
+                .And
+                .HaveStdOutContaining("Hello, from MSBuild!");
+
+            new MSBuildCommand()
+                .WithWorkingDirectory(testProjectDirectory)
+                .ExecuteWithCapturedOutput("/t:SayGoodbye")
+                .Should()
+                .Pass()
+                .And
+                .HaveStdOutContaining("Goodbye, from MSBuild. :'(");
+
+            new MSBuildCommand()
+                .WithWorkingDirectory(testProjectDirectory)
+                .ExecuteWithCapturedOutput("/t:SayThis /p:This=GreatScott")
+                .Should()
+                .Pass()
+                .And
+                .HaveStdOutContaining("You want me to say 'GreatScott'");
+        }
+    }
+}

test/dotnet-msbuild.Tests/dotnet-msbuild.Tests.xproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0.23107" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0.23107</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DNX\Microsoft.DNX.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>2ffcbdf0-ba36-4393-8ddb-1ae04aea3cd6</ProjectGuid>
+    <RootNamespace>Microsoft.DotNet.Cli.MSBuild.Tests</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">..\..\artifacts\obj\$(MSBuildProjectName)</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">..\..\artifacts\bin</OutputPath>
+  </PropertyGroup>
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
+  </ItemGroup>
+  <Import Project="$(VSToolsPath)\DNX\Microsoft.DNX.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>

test/dotnet-msbuild.Tests/project.json

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+{
+  "version": "1.0.0-*",
+  "dependencies": {
+    "Microsoft.NETCore.App": {
+      "type": "platform",
+      "version": "1.0.1"
+    },
+    "System.Runtime.Serialization.Primitives": "4.1.1",
+    "Microsoft.DotNet.Tools.Tests.Utilities": {
+      "target": "project"
+    },
+    "xunit": "2.2.0-beta3-build3330",
+    "dotnet-test-xunit": "1.0.0-rc2-350904-49"
+  },
+  "frameworks": {
+    "netcoreapp1.0": {
+      "imports": [
+        "dotnet5.4",
+        "portable-net451+win8"
+      ]
+    }
+  },
+  "testRunner": "xunit"
+}