code: def test_ones(self):
      m, n = 10, 2
      x = np.ones((m, n))
  
      for depth in range(1, 50):
          preproc = FeatureSqueezing(
              clip_values=(0, 1), bit_depth=depth
          )
          x_squeezed, _ = preproc(x)
          self.assertTrue((x_squeezed == 1).all())
  
file_path: adversarial-robustness-toolbox/tests/defences/test_feature_squeezing.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import unittest
  import numpy
  from art.defences.preprocessor import FeatureSqueezing
  from tests.utils import master_seed
label_desc: Use image node_id 2 for calling the TestFeatureSqueezing obj's underlying member method code with example usage: obj.test_ones() without return types