class_docstr: Test the JointPlot visualizer without histograms
class_docstr_tok: ["Test","the","JointPlot","visualizer","without","histograms"]
docstr: When self.columns=str image similarity on pandas dataset
docstr_tok: ["When","self.columns=str","image","similarity","on","pandas","dataset"]
code: def test_columns_single_str_index_pandas(self):
      """
      When self.columns=str image similarity on pandas dataset
      """
      oz = JointPlot(columns="a", hist=False)
      X = pd.DataFrame(self.continuous.X, columns=["a", "b"])
      y = pd.Series(self.continuous.y)
      assert oz.fit(X, y) is oz
      assert hasattr(oz, "corr_")
  
      oz.finalize()
      # Appveyor and Linux conda failed based on non-text-based differences
      self.assert_images_similar(oz, tol=5.5)
  
imports: import sys
  import pytest
  import numpy
  from functools import partial
  from unittest.mock import patch, MagicMock
  from sklearn.datasets import make_classification, make_regression
  from tests.base import IS_WINDOWS_OR_CONDA, VisualTestCase
  from yellowbrick.exceptions import YellowbrickValueError
  from yellowbrick.features.jointplot import *
  from ..fixtures import Dataset
label_desc: Use image node_id 14 for calling the TestJointPlotNoHistogram obj's underlying member method code with example usage: obj.test_columns_single_str_index_pandas() without return types