code: def test_axvspan():
      ax = plt.subplot(projection="polar")
      span = ax.axvspan(0, np.pi / 4)
      assert span.get_path()._interpolation_steps > 1
  
imports: import numpy
  from numpy.testing import assert_allclose
  import pytest
  import matplotlib
  from matplotlib import pyplot
  from matplotlib.testing.decorators import image_comparison, check_figures_equal
label_desc: Use image node_id 29 for calling a global function with example usage: test_axvspan() without return types