code: def test_build_type_chart(self):
      chart = vcf_stats_vis._build_type_chart(
          VIS_DATA["variant_type_counts"]
      )
      self.assertTrue(is_an_altair_chart(chart))
  
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 5 for calling the VcfStatsVisTest obj's underlying member method code with example usage: obj.test_build_type_chart() without return types