code: def test_all_01(self):
      h = haralick.Haralick(gray, labels, 0, 1, nlevels=4)
      fv = h.all()
      self.assertTrue((np.array(list(map(len, fv))) == 1).all())
  
imports: import unittest
  import centrosome.haralick
  import numpy
label_desc: Use image node_id 18 for calling the TestHaralick obj's underlying member method code with example usage: obj.test_all_01() without return types