feat: add ReparsePoint attribute when creating a symbolic link (#1024)

Files or directories which are a symbolic link should have the `ReparsePoint` attribute set.

Author: vbreuss

src/TestableIO.System.IO.Abstractions.TestingHelpers/MockDirectory.cs

@@ -107,7 +107,9 @@ public override IFileSystemInfo CreateSymbolicLink(string path, string pathToTar
             mockFileDataAccessor.AddDirectory(path);
             mockFileDataAccessor.GetFile(path).LinkTarget = pathToTarget;
 
-            return new MockDirectoryInfo(mockFileDataAccessor, path);
+            var directoryInfo = new MockDirectoryInfo(mockFileDataAccessor, path);
+            directoryInfo.Attributes |= FileAttributes.ReparsePoint;
+            return directoryInfo;
         }
 #endif
 

src/TestableIO.System.IO.Abstractions.TestingHelpers/MockFile.cs

@@ -195,7 +195,9 @@ public override IFileSystemInfo CreateSymbolicLink(string path, string pathToTar
             destFileData.LinkTarget = pathToTarget;
             mockFileDataAccessor.AddFile(path, destFileData);
 
-            return new MockFileInfo(mockFileDataAccessor, path);
+            var mockFileInfo = new MockFileInfo(mockFileDataAccessor, path);
+            mockFileInfo.Attributes |= FileAttributes.ReparsePoint;
+            return mockFileInfo;
         }
 #endif
         /// <inheritdoc />

tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectorySymlinkTests.cs

@@ -198,6 +198,20 @@ public void MockDirectory_CreateSymbolicLink_ShouldFailIfTargetDoesNotExist()
             Assert.That(ex.Message.Contains(pathToTarget));
         }
 
+        [Test]
+        public void MockDirectory_CreateSymbolicLink_ShouldSetReparsePointAttribute()
+        {
+            var path = "foo";
+            var pathToTarget = "bar";
+            var fileSystem = new MockFileSystem();
+            fileSystem.Directory.CreateDirectory(pathToTarget);
+
+            fileSystem.Directory.CreateSymbolicLink(path, pathToTarget);
+
+            var attributes = fileSystem.DirectoryInfo.New(path).Attributes;
+            Assert.IsTrue(attributes.HasFlag(FileAttributes.ReparsePoint));
+        }
+
         [Test]
         public void MockDirectory_ResolveLinkTarget_ShouldReturnPathOfTargetLink()
         {

tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockFileSymlinkTests.cs

@@ -228,6 +228,20 @@ public void MockFile_CreateSymbolicLink_ShouldFailIfPathDirectoryDoesNotExist()
             Assert.That(ex.Message.Contains(path));
         }
 
+        [Test]
+        public void MockFile_CreateSymbolicLink_ShouldSetReparsePointAttribute()
+        {
+            var path = "foo.txt";
+            var pathToTarget = "bar.txt";
+            var fileSystem = new MockFileSystem();
+            fileSystem.File.WriteAllText(pathToTarget, "some content");
+
+            fileSystem.File.CreateSymbolicLink(path, pathToTarget);
+
+            var attributes = fileSystem.FileInfo.New(path).Attributes;
+            Assert.IsTrue(attributes.HasFlag(FileAttributes.ReparsePoint));
+        }
+
         [Test]
         public void MockFile_ResolveLinkTarget_ShouldReturnPathOfTargetLink()
         {