code: def test_dict_to_dataframe(self):
      self.assertEqual("K", "K")
      self.assertEqual(
          vcf_stats_vis._dict_to_dataframe({"A": "a"}).to_dict(
              "records"
          ),
          [{"label": "A", "value": "a"}],
      )
  
imports: import os
  import tempfile
  from absl.testing import absltest
  import altair
  import pandas
  import tensorflow
  from deepvariant import vcf_stats_vis
label_desc: Use image node_id 1 for calling the VcfStatsVisTest obj's underlying member method code with example usage: obj.test_dict_to_dataframe() without return types