'C{asBytesMode} on a L{bytes}-mode L{FilePath} returns the same
L{bytes}-mode L{FilePath}.'

def test_asBytesModeFromBytes(self):

    fp = filepath.FilePath('./tmp')
    newfp = fp.asBytesMode()
    self.assertIs(fp, newfp)
    self.assertIsInstance(newfp.path, bytes)
