def METHOD_NAME(self, enabled):
    """
    Verify that the existing parameteres are updated when provided through a YAML file.
    """
    self.create_fixture_site_configuration(enabled)
    call_command(self.command, '-f', str(self.json_file_path.abspath()), *self.site_id_arg)
    site_configuration = self.get_site_configuration()
    expected_site_configuration = {'ABC': 'abc', 'B': 'b'}
    with codecs.open(self.json_file_path, encoding='utf-8') as f:
        expected_site_configuration.update(json.load(f))
    assert site_configuration.site_values == expected_site_configuration
    assert site_configuration.enabled == enabled