code: def test_anti_aliasing_fxaa(default_theme):
      default_theme.anti_aliasing = "fxaa"
      assert default_theme.anti_aliasing == "fxaa"
      pl = pv.Plotter(theme=default_theme)
      assert pl.renderer.GetUseFXAA()
  
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 47 for calling a global function with example usage: test_anti_aliasing_fxaa(default_theme) without return types