code: def test_jointgrid(self):
      df = self.iris
  
      jg = df.sns.JointGrid(x=df.columns[1], y=df.columns[1])
      self.assertIsInstance(jg, sns.JointGrid)
  
imports: import pytest
  import matplotlib
  import numpy
  import sklearn.datasets
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 10 for calling the TestSeabornCategorical obj's underlying member method code with example usage: obj.test_jointgrid() without return types