def METHOD_NAME(self):
    collation = BasicFieldCollation(
        [_make_field(blev=1), _make_field(blev=2)]
    )
    result = collation.element_arrays_and_dims
    keys = set(
        ["blev", "brsvd1", "brsvd2", "brlev", "bhrlev", "lblev", "bhlev"]
    )
    self.assertEqual(set(result.keys()), keys)
    values, dims = result["blev"]
    self.assertArrayEqual(values, [1, 2])
    self.assertEqual(dims, (0,))