def METHOD_NAME(self):
    super().METHOD_NAME()
    # load the summary file
    summary = openmc.Summary('summary.h5')
    # get the summary cells
    cells = summary.geometry.get_all_cells()
    # for the 2 by 2 lattice, each cell should have 4
    # temperature values set to 300 K
    for cell in cells.values():
        if isinstance(cell.fill, openmc.Material):
            assert len(cell.temperature) == 4
            assert_allclose(cell.temperature[:3], 300.0)
            assert_allclose(cell.temperature[-1:], 400.0)