code: def test_histogram_single(self, long_df, single_args):
      h = Hist()
      out = h(long_df, *single_args)
      hist, edges = np.histogram(long_df["x"], bins="auto")
      assert_array_equal(out["y"], hist)
      assert_array_equal(out["space"], np.diff(edges))
  
imports: import numpy
  import pandas
  import pytest
  from numpy.testing import assert_array_equal
  from seaborn._core.groupby import GroupBy
  from seaborn._stats.counting import Hist, Count
label_desc: Use image node_id 28 for calling the TestHist obj's underlying member method code with example usage: obj.test_histogram_single(long_df, single_args) without return types