code: def test_widths_fill(self, toy_df_widths):
      groupby = GroupBy(["x", "grp"])
      res = Dodge(empty="fill")(toy_df_widths, groupby, "x", {})
  
      assert_array_equal(res["y"], [1, 2, 3])
      assert_array_almost_equal(res["x"], [-0.08, 0.32, 1])
      assert_array_almost_equal(res["width"], [0.64, 0.16, 0.4])
  
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 6 for calling the TestDodge obj's underlying member method code with example usage: obj.test_widths_fill(toy_df_widths) without return types