code: def test_data(self):
      self.x = ["hello", "happy", "world"]
      self.xy = [2, 6, 3]
      self.y = ["Python", "is", "fun"]
      self.yx = [3, 4, 5]
  
imports: import warnings
  import pytest
  import numpy
  import matplotlib
  from matplotlib.axes import Axes
  import matplotlib.pyplot
  import matplotlib.category
  from matplotlib.testing.decorators import check_figures_equal
label_desc: Use image node_id 2 for calling the TestPlotTypes obj's underlying member method code with example usage: obj.test_data() without return types