code: def test_2D_pathway_on_cylinder_extension_velocity(self):
      q = dynamicsymbols("q")
      qd = dynamicsymbols("q", 1)
      pA_pos = self.r * self.N.x
      pB_pos = self.r * (cos(q) * self.N.x + sin(q) * self.N.y)
      self.pA.set_pos(self.pO, pA_pos)
      self.pB.set_pos(self.pO, pB_pos)
      expected = self.r * (sqrt(q**2) / q) * qd
      assert simplify(self.pathway.extension_velocity - expected) == 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 19 for calling the TestWrappingPathway obj's underlying member method code with example usage: obj.test_2D_pathway_on_cylinder_extension_velocity() without return types