code: def test_plot_normals(flip, faces):
      sphere = pv.Sphere(0.5, theta_resolution=10, phi_resolution=10)
      sphere.plot_normals(off_screen=True, flip=flip, faces=faces)
  
file_path: pyvista/tests/plotting/test_plotting_utilities.py
imports: import os
  from PIL import Image, ImageSequence
  import numpy
  import pytest
  import pyvista
  from pyvista import examples
  from pyvista.plotting.helpers import view_vectors
  from pyvista.report import GPUInfo
label_desc: Use image node_id 6 for calling a global function with example usage: test_plot_normals(flip, faces) without return types