code: def test_main(self):
      doc_df = pd.DataFrame(
          {
              "Text": [
                  x.strip()
                  for x in """b a m n i b e u p
          b a s a t b e w q n
          b c a g a b e s t a
          b a g h a b e a a t
          b a h a a b e a x a t""".split(
                      "\n"
                  )
              ]
          }
      ).assign(
          Parse=lambda df: df.Text.apply(whitespace_nlp),
      )
      corpus = (
          CorpusWithoutCategoriesFromParsedDocuments(
              doc_df, parsed_col="Parse"
          )
          .build()
          .get_unigram_corpus()
      )
      dispersion_df = Dispersion(corpus).get_df()
      dispersion_df = dispersion_df.loc[["b", "i", "q", "x"]]
      assert list(dispersion_df["Range"].values) == [5, 1, 1, 1]
      assert list(dispersion_df["SD"].values) == [0, 0.4, 0.4, 0.4]
      assert list(dispersion_df["VC"].values) == [0, 2, 2, 2]
      np.testing.assert_almost_equal(
          list(dispersion_df["Juilland's D"].values),
          np.array([0.968, 0, 0, 0]),
          decimal=3,
      )
      np.testing.assert_almost_equal(
          list(dispersion_df["Rosengren's S"].values),
          np.array([0.999, 0.18, 0.2, 0.22]),
          decimal=3,
      )
      np.testing.assert_almost_equal(
          list(dispersion_df["DP"].values),
          np.array([0.02, 0.82, 0.8, 0.78]),
          decimal=3,
      )
      np.testing.assert_almost_equal(
          list(dispersion_df["DP norm"].values),
          np.array([0.024, 1, 0.976, 0.951]),
          decimal=3,
      )
      np.testing.assert_almost_equal(
          list(dispersion_df["KL-divergence"].values),
          np.array([0.003, 2.474, 2.322, 2.184]),
          decimal=3,
      )
  
file_path: scattertext/scattertext/test/test_Dispersion.py
imports: import unittest
  from turtle import st
  import pandas
  import numpy
  from scattertext.WhitespaceNLP import whitespace_nlp
  from scattertext import Dispersion, CorpusWithoutCategoriesFromParsedDocuments
label_desc: Use image node_id 1 for calling the TestDispersion obj's underlying member method code with example usage: obj.test_main() without return types