code: def test_StrCategoryFormatterPlot(self, ydata, plotter):
      ax = plt.figure().subplots()
      plotter(ax, range(len(ydata)), ydata)
      for i, d in enumerate(ydata):
          assert ax.yaxis.major.formatter(i) == d
      assert ax.yaxis.major.formatter(i + 1) == ""
  
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 TestStrCategoryFormatter obj's underlying member method code with example usage: obj.test_StrCategoryFormatterPlot(ydata, plotter) without return types