def METHOD_NAME(self):
    """Test count_spells func."""
    ref_spells = count_spells(self.time_cube.data, -1000., 0, 1)
    np.testing.assert_equal(24, ref_spells)
    ref_spells = count_spells(self.time_cube.data, -1000., 0, 2)
    np.testing.assert_equal(12, ref_spells)