code: def testGraphExecutionTraceDigestToJson(self):
      trace_digest = debug_events_reader.GraphExecutionTraceDigest(
          1234, 5678, "FooOp", "Model_1/Foo_2", 1, "deadbeef"
      )
      json = trace_digest.to_json()
      self.assertEqual(json["wall_time"], 1234)
      self.assertEqual(json["op_type"], "FooOp")
      self.assertEqual(json["op_name"], "Model_1/Foo_2")
      self.assertEqual(json["output_slot"], 1)
      self.assertEqual(json["graph_id"], "deadbeef")
  
imports: import glob
  import json
  import os
  import re
  import threading
  import time
  from absl.testing import parameterized
  from tensorflow.core.protobuf import debug_event_pb2
  from tensorflow.python.debug.lib import debug_events_reader
  from tensorflow.python.debug.lib import debug_events_writer
  from tensorflow.python.debug.lib import dumping_callback_test_lib
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.framework import versions
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 13 for calling the DataObjectsTest obj's underlying member method code with example usage: obj.testGraphExecutionTraceDigestToJson() without return types