def METHOD_NAME(self):
    grib_message = 'reduced_gg'
    shape = (self.lookup(grib_message, 'numberOfValues'))
    for offset in self.expected:
        with mock.patch('iris_grib.GribDataProxy') as mock_gdp:
            _ = GribWrapper(grib_message, self.grib_fh)
        mock_gdp.assert_called_once_with((shape,), self.dtype,
                                         self.path, offset)