class_docstr: Common tests for noisy mixture distributions.
code: def test_tails_and_offset_are_in_order(self):
      dist = self.dist_cls(
          loc=[5.4, 8.6], scale=[1.4, 2], weight=[0.6, 0.4]
      )
      offset = helpers.quantization_offset(dist)
      lower_tail = helpers.lower_tail(dist, 2**-8)
      upper_tail = helpers.upper_tail(dist, 2**-8)
      self.assertGreater(upper_tail, lower_tail)
      self.assertAllClose(offset, 0.4)
  
imports: import tensorflow
  from tensorflow_compression.python.distributions import helpers
  from tensorflow_compression.python.distributions import uniform_noise
label_desc: Use image node_id 6 for calling the MixtureTest obj's underlying member method code with example usage: obj.test_tails_and_offset_are_in_order() without return types