Dotnet publish tests

test/Microsoft.DotNet.Tools.Tests.Utilities/TempFileSystem/ImmutableArrayTestExtensions.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 System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Diagnostics;
+using System.IO;
+
+namespace Microsoft.DotNet.Tools.Test.Utilities
+{
+    /// <summary>
+    /// The collection of extension methods for the <see cref="ImmutableArray{T}"/> type
+    /// </summary>
+    public static class ImmutableArrayTestExtensions
+    {
+        /// <summary>
+        /// Writes read-only array of bytes to the specified file.
+        /// </summary>
+        /// <param name="bytes">Data to write to the file.</param>
+        /// <param name="path">File path.</param>
+        internal static void WriteToFile(this ImmutableArray<byte> bytes, string path)
+        {
+            Debug.Assert(!bytes.IsDefault);
+
+            const int bufferSize = 4096;
+            using (FileStream fileStream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, bufferSize))
+            {
+                // PERF: Consider using an ObjectPool<byte[]> here
+                byte[] buffer = new byte[Math.Min(bufferSize, bytes.Length)];
+
+                int offset = 0;
+                while (offset < bytes.Length)
+                {
+                    int length = Math.Min(bufferSize, bytes.Length - offset);
+                    bytes.CopyTo(offset, buffer, 0, length);
+                    fileStream.Write(buffer, 0, length);
+                    offset += length;
+                }
+            }
+        }
+    }
+}