def assertFileEncodingNotEqual(self, filename, encoding, msg=None):
        '''Fail if ``filename`` is encoded with the given ``encoding``
        as determined by the '!=' operator.

        Parameters
        ----------
        filename : str, bytes, file-like
        encoding : str, bytes
        msg : str
            If not provided, the :mod:`marbles.mixins` or
            :mod:`unittest` standard message will be used.

        Raises
        ------
        TypeError
            If ``filename`` is not a str or bytes object and is not
            file-like.
        '''
        fencoding = self._get_file_encoding(filename)

        fname = self._get_file_name(filename)
        standardMsg = '%s is %s encoded' % (fname, encoding)

        self.assertNotEqual(fencoding.lower(),
                            encoding.lower(),
                            self._formatMessage(msg, standardMsg))
Fail if ``filename`` is encoded with the given ``encoding``
        as determined by the '!=' operator.

        Parameters
        ----------
        filename : str, bytes, file-like
        encoding : str, bytes
        msg : str
            If not provided, the :mod:`marbles.mixins` or
            :mod:`unittest` standard message will be used.

        Raises
        ------
        TypeError
            If ``filename`` is not a str or bytes object and is not
            file-like.