code: def test_green_quantum():
      q = 2**QUANTUM_DEPTH - 1
      assert Color("black").green_quantum == 0
      assert Color("#0f0").green_quantum == q
      assert Color("white").green_quantum == q
      assert (
          (0.49 * q)
          < Color("rgba(0, 128, 0, 1)").green_quantum
          < (0.51 * q)
      )
      c = Color("none")
      c.green_quantum = q
      assert c.green_quantum == q
  
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 16 for calling a global function with example usage: test_green_quantum() without return types