Copy FileSystemGlobbing and HashCodeCombiner sources

test/Microsoft.DotNet.ProjectModel.Tests/FileSystemGlobbing/TestUtility/DisposableFileSystem.cs

@@ -0,0 +1,61 @@
+// 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;
+
+namespace Microsoft.DotNet.ProjectModel.FileSystemGlobbing.Tests.TestUtility
+{
+    public class DisposableFileSystem : IDisposable
+    {
+        public DisposableFileSystem()
+        {
+            RootPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
+            Directory.CreateDirectory(RootPath);
+            DirectoryInfo = new DirectoryInfo(RootPath);
+        }
+
+        public string RootPath { get; }
+
+        public DirectoryInfo DirectoryInfo { get; }
+
+        public DisposableFileSystem CreateFolder(string path)
+        {
+            Directory.CreateDirectory(Path.Combine(RootPath, path));
+            return this;
+        }
+
+        public DisposableFileSystem CreateFile(string path)
+        {
+            File.WriteAllText(Path.Combine(RootPath, path), "temp");
+            return this;
+        }
+
+        public DisposableFileSystem CreateFiles(params string[] fileRelativePaths)
+        {
+            foreach (var path in fileRelativePaths)
+            {
+                var fullPath = Path.Combine(RootPath, path);
+                Directory.CreateDirectory(Path.GetDirectoryName(fullPath));
+
+                File.WriteAllText(
+                    fullPath,
+                    string.Format("Automatically generated for testing on {0:yyyy}/{0:MM}/{0:dd} {0:hh}:{0:mm}:{0:ss}", DateTime.UtcNow));
+            }
+
+            return this;
+        }
+
+        public void Dispose()
+        {
+            try
+            {
+                Directory.Delete(RootPath, true);
+            }
+            catch
+            {
+                // Don't throw if this fails.
+            }
+        }
+    }
+}