Add preprocessed content file end-to-end test

Author: nguerrera

src/Tests/Microsoft.NET.Build.Tests/GivenThatWeWantToUseContentFiles.cs

@@ -0,0 +1,78 @@
+// 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.IO;
+using Microsoft.NET.TestFramework;
+using Microsoft.NET.TestFramework.Assertions;
+using Microsoft.NET.TestFramework.Commands;
+using Xunit;
+using System.Linq;
+using FluentAssertions;
+using System.Xml.Linq;
+using System.Collections.Generic;
+using System;
+using Xunit.Abstractions;
+using Microsoft.NET.TestFramework.ProjectConstruction;
+
+namespace Microsoft.NET.Build.Tests
+{
+    public class GivenThatWeWantToUseContentFiles : SdkTest
+    {
+        public GivenThatWeWantToUseContentFiles(ITestOutputHelper log) : base(log)
+        {
+        }
+
+
+        [Fact]
+        public void It_handles_content_files_correctly()
+        {
+            const string targetFramework = "netcoreapp2.0";
+
+            var project = new TestProject
+            {
+                Name = "ContentFiles",
+                IsExe = true,
+                TargetFrameworks = targetFramework,
+                IsSdkProject = true,
+                PackageReferences = { new TestPackageReference("ContentFilesExample", "1.0.2") },
+            };
+
+            project.SourceFiles[project.Name + ".cs"] =
+$@"
+using System;
+
+namespace {project.Name}
+{{
+    static class Program
+    {{
+        static void Main()
+        {{
+            Console.WriteLine(ExampleReader.GetDataText());
+        }}
+    }}
+}}";
+
+            var asset = _testAssetsManager
+                .CreateTestProject(project)
+                .Restore(Log, project.Name);
+
+            var cmd = new BuildCommand(Log, Path.Combine(asset.Path, project.Name));
+            cmd.Execute().Should().Pass();
+
+            cmd.GetOutputDirectory(targetFramework)
+               .Should()
+               .OnlyHaveFiles(
+                    new[]
+                    {
+                        "ContentFiles.deps.json",
+                        "ContentFiles.dll",
+                        "ContentFiles.pdb",
+                        "ContentFiles.runtimeconfig.dev.json",
+                        "ContentFiles.runtimeconfig.json",
+                        "tools/run.cmd",
+                        "tools/run.sh",
+                    }
+                );
+        }
+    }
+}