'Map value is not JSON parsable.'

def test_map_value_bad(self):

    schema = {'Type': 'Json', 'ConstraintDescription': 'wibble'}
    val = {'foo': 'bar', 'not_json': len}
    err = self.assertRaises(ValueError, new_parameter, 'p', schema, val)
    self.assertIn('Value    must    be    valid    JSON', six.text_type(err))
