def METHOD_NAME(self):
    error = ValidationError(
        detail=('Invalid value: %(value1)s', 'Invalid value: %(value2)s'),
        params={'value1': '42', 'value2': '43'},
    )
    assert isinstance(error.detail, list)
    assert len(error.detail) == 2
    assert str(error.detail[0]) == 'Invalid value: 42'
    assert str(error.detail[1]) == 'Invalid value: 43'