code: def testMax(self, dtype, expected_maxval):
      self.assertEqual(dtype_util.max(dtype), expected_maxval)
  
imports: import dataclasses
  from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import dtype_util
  from tensorflow_probability.python.internal import test_util
label_desc: Use image node_id 7 for calling the DtypeUtilTest obj's underlying member method code with example usage: obj.testMax(dtype, expected_maxval) without return types