code: def testOptimizationInjectPrefetch(
      self, existing_prefetch, autotune, inject_prefetch
  ):
      dataset = dataset_ops.Dataset.range(5)
      dataset = dataset.map(
          lambda x: x + 1, num_parallel_calls=dataset_ops.AUTOTUNE
      )
      dataset = dataset.batch(1)
      if existing_prefetch:
          dataset = dataset.prefetch(1)
      if autotune and inject_prefetch and not existing_prefetch:
          dataset = dataset.apply(
              testing.assert_next(["Prefetch", "Root"])
          )
      else:
          dataset = dataset.apply(testing.assert_next(["Root"]))
  
      options = options_lib.Options()
      options.autotune.enabled = autotune
      options.experimental_optimization.map_and_batch_fusion = False
      if not inject_prefetch:
          options.experimental_optimization.inject_prefetch = False
      dataset = dataset.with_options(options)
  
      self.assertDatasetProduces(
          dataset, expected_output=[np.array([x]) for x in range(1, 6)]
      )
  
imports: import functools
  import time
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.experimental.ops import batching
  from tensorflow.python.data.experimental.ops import grouping
  from tensorflow.python.data.experimental.ops import scan_ops
  from tensorflow.python.data.experimental.ops import testing
  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.framework import combinations
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import random_ops
  from tensorflow.python.ops import variable_scope
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 7 for calling the OptimizationTest obj's underlying member method code with example usage: obj.testOptimizationInjectPrefetch(existing_prefetch, autotune, inject_prefetch) without return types