code: def test_string():
      assert Color("black").string in ("rgb(0,0,0)", "srgb(0,0,0)")
      assert str(Color("black")) in ("rgb(0,0,0)", "srgb(0,0,0)")
  
imports: import ctypes
  import time
  import warnings
  from pytest import mark, raises
  from wand.color import Color
  from wand.compat import xrange
  from wand.version import QUANTUM_DEPTH, MAGICK_VERSION_INFO
label_desc: Use image node_id 31 for calling a global function with example usage: test_string() without return types