MockFileSystem.File.Move on Windows and .Net 8 doesn't rename a file name's case

[El-Gor-do]

Describe the bug Possibly related to https://github.com/TestableIO/System.IO.Abstractions/issues/1138 On Windows and .Net 8, FileSystem.File.Move successfully renames a file if the destination has a different case than source whereas MockFileSystem.File.Move doesn't rename the file.

To Reproduce Steps to reproduce the behavior: Using System.IO.Abstractions.TestingHelpers 21.0.29

static void Main(string[] args)
{
    FileSystem fs = new FileSystem();
    MockFileSystem mockFs = new MockFileSystem();

    Console.WriteLine("Real file system");
    MoveFile(fs);

    Console.WriteLine("Mock file system");
    MoveFile(mockFs);
}

static void MoveFile(IFileSystem fileSystem)
{
    string tempDir = fileSystem.Path.GetTempPath();
    string src = fileSystem.Path.Combine(tempDir, "src.txt");
    string dest = fileSystem.Path.Combine(tempDir, "SRC.TXT");  // different case

    // create source file
    using (_ = fileSystem.File.Create(src))
    {
    }

    // move file
    fileSystem.File.Move(src, dest);

    // check the moved file's name exact case
    string movedFile = fileSystem.Directory.GetFiles(tempDir, "src.txt").First();
    Console.WriteLine($"Successfully moved \"{src}\" to \"{movedFile}\"");

    if (fileSystem.File.Exists(src))
        fileSystem.File.Delete(src);

    if (fileSystem.File.Exists(dest))
        fileSystem.File.Delete(dest);
}

Actual output

Real file system
Successfully moved "C:\Users\El-Gor-do\AppData\Local\Temp\src.txt" to "C:\Users\El-Gor-do\AppData\Local\Temp\SRC.TXT"
Mock file system
Successfully moved "C:\temp\src.txt" to "C:\temp\src.txt"

Expected behavior MockFileSystem.File.Move should successfully rename the file to SRC.TXT

Real file system
Successfully moved "C:\Users\El-Gor-do\AppData\Local\Temp\src.txt" to "C:\Users\El-Gor-do\AppData\Local\Temp\SRC.TXT"
Mock file system
Successfully moved "C:\temp\src.txt" to "C:\temp\SRC.TXT"

[vbreuss]

When fixing this, it would probably be easy to also have an eye out for the correct behaviour in File.Copy and File.Replace when source and destination differ only in casing...

[RobinDoesUnity]

Hi @vbreuss, @El-Gor-do, first time contributor here. I would like to look into fixing this.

[vbreuss]

Hi @vbreuss, @El-Gor-do, first time contributor here. I would like to look into fixing this.

Please feel welcome to create a pull request.

[KasinathCR]

@vbreuss - I'll look into this, Bro. Please assign it to me👍

[vbreuss]

@RobinDoesUnity : Are you still working on this issue?

[RobinDoesUnity]

Hi @vbreuss, you can assign it to someone else. Sorry, I was busy these days.

[vbreuss]

Fixed by #1259