def remove(self, elem):
        """Remove a requirement.

        :param elem: a string or :class:`Requirement` instance.
        """
        if isinstance(elem, text_type):
            for requirement in self:
                if requirement.package == elem:
                    return super(Requirements, self).remove(requirement)
        return super(Requirements, self).remove(elem)
def test_statements():
    with pytest.raises(mariofile.ConfigurationFileError):
        mariofile.parse_section_body(CRASH_MARIOFILE_1.splitlines())
    with pytest.raises(mariofile.ConfigurationFileError):
        mariofile.parse_section_body(CRASH_MARIOFILE_2.splitlines())