code: def test_octahedron():
      radius = 1.7
      center = (1, -2, 3)
      solid = pv.Octahedron(radius=radius, center=center)
      assert solid.n_points == 6
      assert solid.n_faces_strict == 8
      assert np.allclose(solid.center, center)
  
      doubled_solid = pv.Octahedron(radius=2 * radius, center=center)
      assert np.isclose(doubled_solid.length, 2 * solid.length)
  
imports: from itertools import permutations
  import re
  import numpy
  import pytest
  import pyvista
label_desc: Use image node_id 50 for calling a global function with example usage: test_octahedron() without return types