class_docstr: Test the JointPlot visualizer without histograms
class_docstr_tok: ["Test","the","JointPlot","visualizer","without","histograms"]
docstr: When self.columns=None image similarity with valid X, no y
docstr_tok: ["When","self.columns=None","image","similarity","with","valid","X",",","no","y"]
code: def test_columns_none_x(self):
      """
      When self.columns=None image similarity with valid X, no y
      """
      oz = JointPlot(hist=False, columns=None)
      assert oz.fit(self.discrete.X) is oz
      assert hasattr(oz, "corr_")
  
      oz.finalize()
      tol = (
          4.0 if sys.platform == "win32" else 0.01
      )  # Fails on AppVeyor with RMS 3.941
      self.assert_images_similar(oz, tol=tol)
  
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 9 for calling the TestJointPlotNoHistogram obj's underlying member method code with example usage: obj.test_columns_none_x() without return types