code: def testEventStorage(self):
      self.assertFalse(has_event_storage())
      with EventStorage() as storage:
          self.assertTrue(has_event_storage())
          self.assertEqual(storage, get_event_storage())
      self.assertFalse(has_event_storage())
  
file_path: detectron2/tests/test_events.py
imports: import json
  import os
  import tempfile
  import unittest
  from detectron2.utils.events import CommonMetricPrinter, EventStorage, JSONWriter, get_event_storage, has_event_storage
label_desc: Use image node_id 6 for calling the TestEventWriter obj's underlying member method code with example usage: obj.testEventStorage() without return types