Removing Microsoft.DotNet.TestFramework from the product code and from the SDK deployment and moving the code to the test folder.

test/Microsoft.DotNet.TestFramework/TestAssetInfo.cs

@@ -0,0 +1,80 @@
+// 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.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.CompilerServices;
+
+namespace Microsoft.DotNet.TestFramework
+{
+    public class TestAssetInfo
+    {
+        private readonly string [] FilesToExclude = { ".DS_Store", ".noautobuild" };
+
+        public string AssetName { get; private set; }
+
+        public FileInfo DotnetExeFile => _testAssets.DotnetCsprojExe;
+
+        public string ProjectFilePattern => "*.csproj";
+
+        public DirectoryInfo Root { get; private set; }
+
+        private TestAssets _testAssets { get; }
+
+        internal TestAssetInfo(DirectoryInfo root, string assetName, TestAssets testAssets)
+        {
+            if (root == null)
+            {
+                throw new ArgumentNullException(nameof(root));
+            }
+
+            if (string.IsNullOrWhiteSpace(assetName))
+            {
+                throw new ArgumentException("Argument cannot be null or whitespace", nameof(assetName));
+            }
+
+            if (testAssets == null)
+            {
+                throw new ArgumentNullException(nameof(testAssets));
+            }
+
+            Root = root;
+
+            AssetName = assetName;
+
+            _testAssets = testAssets;
+        }
+
+        public TestAssetInstance CreateInstance([CallerMemberName] string callingMethod = "", string identifier = "")
+        {
+            var instancePath = GetTestDestinationDirectory(callingMethod, identifier);
+
+            var testInstance = new TestAssetInstance(this, instancePath);
+
+            return testInstance;
+        }
+
+        internal IEnumerable<FileInfo> GetSourceFiles()
+        {
+            ThrowIfTestAssetDoesNotExist();
+
+            return Root.GetFiles("*.*", SearchOption.AllDirectories)
+                        .Where(f => !FilesToExclude.Contains(f.Name));
+        }
+
+        private DirectoryInfo GetTestDestinationDirectory(string callingMethod, string identifier)
+        {
+            return _testAssets.CreateTestDirectory(AssetName, callingMethod, identifier);
+        }
+
+        private void ThrowIfTestAssetDoesNotExist()
+        {
+            if (!Root.Exists)
+            { 
+                throw new DirectoryNotFoundException($"Directory not found at '{Root.FullName}'"); 
+            } 
+        }
+    }
+}