code: def test_body_ang_vel():
      A = Body("A")
      N = ReferenceFrame("N")
      B = Body("B", frame=N)
      A.frame.set_ang_vel(N, N.y)
      assert A.ang_vel_in(B) == N.y
      assert B.ang_vel_in(A) == -N.y
      assert A.ang_vel_in(N) == N.y
  
imports: from sympy import Symbol, symbols, sin, cos, Matrix, zeros, simplify
  from sympy.physics.vector import Point, ReferenceFrame, dynamicsymbols, Dyadic
  from sympy.physics.mechanics import inertia, Body
  from sympy.testing.pytest import raises
label_desc: Use image node_id 8 for calling a global function with example usage: test_body_ang_vel() without return types