fix: file move after directory move doesn't work correctly (#700)

Co-authored-by: Flepp Jann <JFlepp@Hamilton.ch>
Co-authored-by: Florian Greinacher <florian@greinacher.de>

Author: 3 people

src/System.IO.Abstractions.TestingHelpers/MockFileSystem.cs

@@ -249,7 +249,9 @@ public void MoveDirectory(string sourcePath, string destPath)
                 foreach (var path in affectedPaths)
                 {
                     var newPath = StringOperations.Replace(path, sourcePath, destPath);
-                    files[newPath] = files[path];
+                    var entry = files[path];
+                    entry.Path = newPath;
+                    files[newPath] = entry;
                     files.Remove(path);
                 }
             }

tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileSystemTests.cs

@@ -1,7 +1,6 @@
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.ComponentModel;
-using System.Diagnostics;
 using System.Linq;
 using System.Reflection;
 using System.Text;
@@ -250,6 +249,20 @@ public void MockFileSystem_AddFilesFromEmbeddedResource_ShouldAddAllTheFiles()
             Assert.Contains(XFS.Path(@"C:\SecondTestFile.txt"), fileSystem.AllFiles.ToList());
         }
 
+        [Test]
+        public void MockFileSystem_MoveDirectoryAndFile_ShouldMoveCorrectly()
+        {
+            var fileSystem = new MockFileSystem();
+            fileSystem.AddFile(XFS.Path(@"C:\source\project.txt"), string.Empty);
+            fileSystem.AddFile(XFS.Path(@"C:\source\subdir\other.txt"), string.Empty);
+
+            fileSystem.Directory.Move(XFS.Path(@"C:\source"), XFS.Path(@"C:\target"));
+            fileSystem.File.Move(XFS.Path(@"C:\target\project.txt"), XFS.Path(@"C:\target\proj.txt"));
+
+            var expected = new[] { XFS.Path(@"C:\target\proj.txt"), XFS.Path(@"C:\target\subdir\other.txt") };
+            CollectionAssert.AreEquivalent(expected, fileSystem.AllFiles);
+        }
+
         [Test]
         public void MockFileSystem_RemoveFile_RemovesFiles()
         {