code: def test_viewer_load_df_data(self):
      viewer = PerspectiveViewer()
      viewer.load(pd.DataFrame({"a": np.arange(1, 100)}))
      for col in viewer.columns:
          assert col in ["index", "a"]
  
imports: import numpy
  import pandas
  from perspective import PerspectiveViewer, Table
label_desc: Use image node_id 13 for calling the TestViewer obj's underlying member method code with example usage: obj.test_viewer_load_df_data() without return types