code: def test_plane():
      """Test plane function"""
      vertices, filled, outline = create_plane()
      assert_array_equal(np.arange(len(vertices)), np.unique(filled))
      assert_array_equal(np.arange(len(vertices)), np.unique(outline))
  
file_path: vispy/vispy/geometry/tests/test_generation.py
imports: import numpy
  from numpy.testing import assert_array_equal, assert_allclose
  from vispy.testing import run_tests_if_main
  from vispy.geometry import create_box, create_cube, create_cylinder, create_sphere, create_plane
label_desc: Use image node_id 5 for calling a global function with example usage: test_plane() without return types