code: def test_Curl():
      assert Curl(v1) == Curl(R.x * R.i + R.z * R.z * R.j)
      assert Curl(v2) == Curl(R.x * R.i + R.y * R.j + R.z * R.k)
      assert Curl(v1).doit() == (-2 * R.z) * R.i
      assert Curl(v2).doit() == VectorZero()
  
imports: from sympy.vector import CoordSys3D, Gradient, Divergence, Curl, VectorZero, Laplacian
  from sympy.printing.repr import srepr
label_desc: Use image node_id 3 for calling a global function with example usage: test_Curl() without return types