code: def test_get_visualization(self):
      try:
          import altair
      except:
          return
      DiachronicTermMiner(self.corpus, num_terms=10).visualize()
  
file_path: scattertext/scattertext/test/test_diachronicTermMiner.py
imports: from unittest import TestCase
  import io
  import pandas
  from scattertext.CorpusFromParsedDocuments import CorpusFromParsedDocuments
  from scattertext.WhitespaceNLP import whitespace_nlp_with_sentences
  from scattertext.diachronic.DiachronicTermMiner import DiachronicTermMiner
label_desc: Use image node_id 4 for calling the TestDiachronicTermMiner obj's underlying member method code with example usage: obj.test_get_visualization() without return types