code: def testPrefetchWithSlack(self, buffer_size, slack_period):
      dataset = dataset_ops.Dataset.range(100)
      dataset = prefetch_op._PrefetchDataset(  # pylint: disable=protected-access
          dataset, buffer_size, slack_period=slack_period
      )
      self.assertDatasetProduces(dataset, expected_output=range(100))
  
imports: import time
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.experimental.ops import random_access
  from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import options
  from tensorflow.python.data.ops import prefetch_op
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the PrefetchTest obj's underlying member method code with example usage: obj.testPrefetchWithSlack(buffer_size, slack_period) without return types