code: def test_static_pathway_extension_velocity(self):
      self.pA.set_pos(self.pO, self.N.x)
      self.pB.set_pos(self.pO, self.N.y)
      self.pI.set_pos(self.pO, self.N.z)
      pathway = ObstacleSetPathway(self.pO, self.pA, self.pB, self.pI)
      assert pathway.extension_velocity == 0
  
imports: import pytest
  from sympy import Rational, Symbol, cos, pi, sin, sqrt
  from sympy.physics.mechanics import Force, LinearPathway, ObstacleSetPathway, PathwayBase, Point, ReferenceFrame, WrappingCylinder, WrappingGeometryBase, WrappingPathway, WrappingSphere, dynamicsymbols
  from sympy.simplify.simplify import simplify
label_desc: Use image node_id 9 for calling the TestObstacleSetPathway obj's underlying member method code with example usage: obj.test_static_pathway_extension_velocity() without return types