MockDirectory.Move fails if drive letters are different cases.

[ephsiung]

MockDirectory.Move() can fail if drive letters are different cases.

The problem can be duplicated with a slight modification of the MockDirectory_Move_ShouldMove() unit test. Simply change

{ XFS.Path(@"A:\folder1\folder2\file2.txt"), new MockFileData("bbb") },

to

{ XFS.Path(@"a:\folder1\folder2\file2.txt"), new MockFileData("bbb") },

And the test now fails with the following exception:

System.IO.IOException : Source and destination path must be different.
at System.IO.Abstractions.TestingHelpers.MockDirectory.Move(String sourceDirName, String destDirName) in MockDirectory.cs: line 300
at System.IO.Abstractions.TestingHelpers.MockDirectory.Move(String sourceDirName, String destDirName) in MockDirectory.cs: line 318
at System.IO.Abstractions.TestingHelpers.MockDirectoryInfo.MoveTo(String destDirName) in MockDirectoryInfo.cs: line 219
at System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryTests.MockDirectory_Move_ShouldMove() in MockDirectoryTests.cs: line 730