code: def testMin(self, dtype, expected_minval):
      self.assertEqual(dtype_util.min(dtype), expected_minval)
  
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 6 for calling the DtypeUtilTest obj's underlying member method code with example usage: obj.testMin(dtype, expected_minval) without return types