public void RenameSubtitleFile_FilePathsGiven_FileSystemMoveIsCalled(
            string source, 
            string target,
            FileBase fileBase,
            [Frozen]IFileSystem fileSystem,
            FileOperations sut
            )
        {
            A.CallTo(() => fileSystem.File).Returns(fileBase);

            sut.RenameSubtitleFile(source, target);

            A.CallTo(() => fileBase.Move(source, target)).MustHaveHappened();
        }