code: def check_pos(self, res, df, var, limit):
      assert (res[var] != df[var]).all()
      assert (res[var] < df[var] + limit / 2).all()
      assert (res[var] > df[var] - limit / 2).all()
  
imports: from itertools import product
  import numpy
  import pandas
  from pandas.testing import assert_series_equal
  from numpy.testing import assert_array_equal, assert_array_almost_equal
  from seaborn._core.moves import Dodge, Jitter, Shift, Stack, Norm
  from seaborn._core.rules import categorical_order
  from seaborn._core.groupby import GroupBy
  import pytest
label_desc: Use image node_id 3 for calling the TestJitter obj's underlying member method code with example usage: obj.check_pos(res, df, var, limit) without return types