fix: support changing only case in when moving mock files (#740)

Closes #737
Co-authored-by: soi013 <soi2flatline@gmail.com>

Author: fgreinacher

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

@@ -330,7 +330,7 @@ public override void Move(string sourceFileName, string destFileName)
 
             if (mockFileDataAccessor.GetFile(destFileName) != null)
             {
-                if (destFileName.Equals(sourceFileName))
+                if (mockFileDataAccessor.StringOperations.Equals(destFileName, sourceFileName))
                 {
                     return;
                 }
@@ -340,7 +340,6 @@ public override void Move(string sourceFileName, string destFileName)
                 }
             }
 
-
             var sourceFile = mockFileDataAccessor.GetFile(sourceFileName);
 
             if (sourceFile == null)

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

@@ -1,5 +1,6 @@
 using System.Runtime.Versioning;
 using System.Security.AccessControl;
+using System.Text;
 
 namespace System.IO.Abstractions.TestingHelpers
 {
@@ -230,25 +231,15 @@ public override FileSecurity GetAccessControl(AccessControlSections includeSecti
 
         public override void MoveTo(string destFileName)
         {
-            var movedFileInfo = CopyTo(destFileName);
-            if (destFileName == FullName)
-            {
-                return;
-            }
-            Delete();
-            path = movedFileInfo.FullName;
+            mockFileSystem.File.Move(path, destFileName);
+            path = mockFileSystem.Path.GetFullPath(destFileName);
         }
 
 #if FEATURE_FILE_MOVE_WITH_OVERWRITE
         public override void MoveTo(string destFileName, bool overwrite)
         {
-            var movedFileInfo = CopyTo(destFileName, overwrite);
-            if (destFileName == FullName)
-            {
-                return;
-            }
-            Delete();
-            path = movedFileInfo.FullName;
+            mockFileSystem.File.Move(path, destFileName, overwrite);
+            path = mockFileSystem.Path.GetFullPath(destFileName);
         }
 #endif
 

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

@@ -548,6 +548,23 @@ public void MockFileInfo_MoveToWithOverwrite_ShouldSucceedWhenTargetAlreadyExist
         }
 #endif
 
+        [Test]
+        public void MockFileInfo_MoveToOnlyCaseChanging_ShouldSucceed()
+        {
+            string sourceFilePath = XFS.Path(@"c:\temp\file.txt");
+            string destFilePath = XFS.Path(@"c:\temp\FILE.txt");
+            var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
+            {
+                {sourceFilePath, new MockFileData("1")},
+            });
+
+            var fileInfo = fileSystem.FileInfo.FromFileName(sourceFilePath);
+            fileInfo.MoveTo(destFilePath);
+
+            Assert.AreEqual(fileInfo.FullName, destFilePath);
+            Assert.True(fileInfo.Exists);
+        }
+
         [Test]
         public void MockFileInfo_CopyTo_ThrowsExceptionIfSourceDoesntExist()
         {