code: def test_str_printing():
      assert str(v[0]) == "0"
      assert str(v[1]) == "N.i"
      assert str(v[2]) == "(-1)*N.i"
      assert str(v[3]) == "N.i + N.j"
      assert str(v[8]) == "N.j + (C.x**2 - Integral(f(b), b))*N.k"
      assert str(v[9]) == "C.k + N.i"
      assert str(s) == "3*C.y*N.x**2"
      assert str(d[0]) == "0"
      assert str(d[1]) == "(N.i|N.k)"
      assert str(d[4]) == "a*(N.i|N.k)"
      assert str(d[5]) == "a*(N.i|N.k) + (-b)*(N.j|N.k)"
      assert str(d[8]) == (
          "(N.j|N.k) + (C.x**2 - " + "Integral(f(b), b))*(N.k|N.k)"
      )
  
file_path: sympy/sympy/vector/tests/test_printing.py
imports: from sympy.core.function import Function
  from sympy.integrals.integrals import Integral
  from sympy.printing.latex import latex
  from sympy.printing.pretty import pretty
  from sympy.vector import CoordSys3D, Del, Vector, express
  from sympy.abc import a, b, c
  from sympy.testing.pytest import XFAIL
label_desc: Use image node_id 3 for calling a global function with example usage: test_str_printing() without return types