code: def test_quantize_fixpoint(self):
      q = haralick.quantize(gray, 4)
      self.assertTrue((q == gray4).all())
  
imports: import unittest
  import centrosome.haralick
  import numpy
label_desc: Use image node_id 2 for calling the TestHaralick obj's underlying member method code with example usage: obj.test_quantize_fixpoint() without return types