docstr: Test scaling the fonts
docstr_tok: ["Test","scaling","the","fonts"]
code: def test_font_scale(self):
      """
      Test scaling the fonts
      """
  
      notebook_ref = yb_rcmod._plotting_context("notebook")
      notebook_big = yb_rcmod._plotting_context("notebook", 2)
  
      font_keys = [
          "axes.labelsize",
          "axes.titlesize",
          "legend.fontsize",
          "xtick.labelsize",
          "ytick.labelsize",
          "font.size",
      ]
  
      for k in font_keys:
          assert notebook_ref[k] * 2 == notebook_big[k]
  
imports: import pytest
  import numpy
  import matplotlib
  import numpy.testing
  import yellowbrick.style.rcmod
  from tests.base import VisualTestCase
label_desc: Use image node_id 2 for calling the TestPlottingContext obj's underlying member method code with example usage: obj.test_font_scale() without return types