code: def test_viewer_load_df(self):
      table = Table(pd.DataFrame({"a": np.arange(1, 100)}))
      viewer = PerspectiveViewer()
      viewer.load(table)
      for col in viewer.columns:
          assert col in ["index", "a"]
      assert viewer.table.size() == 99
  
imports: import numpy
  import pandas
  from perspective import PerspectiveViewer, Table
label_desc: Use image node_id 12 for calling the TestViewer obj's underlying member method code with example usage: obj.test_viewer_load_df() without return types