code: def test_restore_defaults(default_theme):
      orig_value = default_theme.show_edges
      default_theme.show_edges = not orig_value
      default_theme.restore_defaults()
      assert default_theme.show_edges == orig_value
  
imports: import os
  import pytest
  import vtk
  import pyvista
  from pyvista import colors
  from pyvista.examples.downloads import download_file
  from pyvista.plotting.themes import DarkTheme, Theme, _set_plot_theme_from_env
  from pyvista.plotting.utilities.gl_checks import uses_egl
label_desc: Use image node_id 39 for calling a global function with example usage: test_restore_defaults(default_theme) without return types