Add IsSymbolicLinkTestCases

src/Test.UnitTests.Sarif/FileSystemTests.cs

@@ -0,0 +1,67 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.IO;
+
+using FluentAssertions;
+
+using Xunit;
+
+namespace Microsoft.CodeAnalysis.Sarif
+{
+
+    public class FileSystemTests
+    {
+        [Fact]
+        [Trait(TestTraits.WindowsOnly, "true")]
+        public void FileSystem_IsSymbolicLinkTestCases()
+        {
+            var mockFileSystem = new FileSystem();
+
+            mockFileSystem.IsSymbolicLink(Environment.SystemDirectory).Should().BeFalse();
+
+            string tempFolder = Path.GetTempPath();
+            string folderTarget = Path.Combine(tempFolder, "symbolicLinkFolderTarget");
+            string folderSource = Path.Combine(tempFolder, "symbolicLinkFolderSource");
+
+            CleanupDirectory(folderTarget);
+            CleanupDirectory(folderSource);
+
+            Directory.CreateDirectory(folderTarget);
+
+            CreateSymbolicLink(folderSource, folderTarget, true);
+
+            mockFileSystem.IsSymbolicLink(folderSource).Should().BeTrue();
+            mockFileSystem.IsSymbolicLink(folderTarget).Should().BeFalse();
+        }
+
+        private void CreateSymbolicLink(string linkPath, string targetPath, bool isDirectory)
+        {
+            string targetType = isDirectory ? "/D" : "";
+            var processStartInfo = new System.Diagnostics.ProcessStartInfo
+            {
+                FileName = "cmd.exe",
+                Arguments = $"/c mklink {targetType} \"{linkPath}\" \"{targetPath}\"",
+                UseShellExecute = false,
+                CreateNoWindow = true
+            };
+            using (var process = System.Diagnostics.Process.Start(processStartInfo))
+            {
+                process.WaitForExit();
+            }
+        }
+
+        private void CleanupDirectory(string path)
+        {
+            if (Directory.Exists(path))
+            {
+                Directory.Delete(path, true);
+            }
+            else if (File.Exists(path))
+            {
+                File.Delete(path);
+            }
+        }
+    }
+}