TestingHelpers: Directory.Move operates on files with a related name

[meisenring]

Describe the bug
Windows user here. I suspect this is a bug in the testing helpers?

Directory.Move operates on files with a related name.:

- source (dir)
    - dummy (dir)
        - content.txt (file)
    - dummy.txt (file)
- destination (dir)

Moving /source/dummy to /destination/dummy will produce the following:

- source (dir)
- destination (dir)
    - dummy (dir)
        - content.txt (file)
    - dummy.txt (file)

What I expected:

- source (dir)
    - dummy.txt (file) <-- not moved
- destination (dir)
    - dummy (dir)
        - content.txt (file)

To Reproduce
Steps to reproduce the behavior:

[Test]
public void MockDirectory_Move_ShouldOnlyMoveDirAndFilesWithinDir()
{
    var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
    {
        // Directory to move and its content:
        {XFS.Path(@"c:\source\dummy"), new MockDirectoryData()},
        {XFS.Path(@"c:\source\dummy\content.txt"), new MockFileData(new byte[] {0})},

        // Unrelated file, not in directory to move, but with a similar name:
        {XFS.Path(@"c:\source\dummy.txt"), new MockFileData(new byte[] {0})},

        // Destination of directory move operation:
        {XFS.Path(@"c:\destination"), new MockDirectoryData()},
    });

    fileSystem.Directory.Move(@"c:\source\dummy", @"c:\destination\dummy");

    Assert.That(fileSystem.FileExists(@"c:\source\dummy.txt"), Is.True);
}

Very cool library 👍

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