code: def test_plane_direction(expected):
      surf = pv.Plane(direction=expected)
      actual = surf.point_normals[0]
      assert np.array_equal(actual, expected)
  
imports: from itertools import permutations
  import re
  import numpy
  import pytest
  import pyvista
label_desc: Use image node_id 23 for calling a global function with example usage: test_plane_direction(expected) without return types