code: def test_font_list():
      """Test font listing"""
      f = list_fonts()
      assert len(f) > 0
      for font in _vispy_fonts:
          assert_in(font, f)
  
imports: import numpy
  import warnings
  from vispy.testing import assert_in, run_tests_if_main
  from vispy.util.fonts import list_fonts, _load_glyph, _vispy_fonts
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: test_font_list() without return types