code: def test_call(self):
      target = mock.MagicMock()
      q = mock.MagicMock()
      consumer = mock.MagicMock()
      names = [
          snapshot_writers_path + ".QueueWriter.create_queue",
          snapshot_writers_path + ".QueueWriter.create_consumer",
      ]
      with mock.patch(names[0], return_value=q):
          with mock.patch(names[1], return_value=consumer):
              w = snapshot_writers.QueueWriter()
  
              with utils.tempdir() as tempd:
                  w("myfile.dat", tempd, target)
                  w("myfile.dat", tempd, target)
                  w.finalize()
  
              assert consumer.start.call_count == 1
              assert q.put.call_count == 3
              assert q.join.call_count, 1
              assert consumer.join.call_count == 1
  
imports: import multiprocessing
  import threading
  import unittest
  import mock
  from chainer import testing
  from chainer.training.extensions import snapshot_writers
  from chainer import utils
label_desc: Use image node_id 1 for calling the TestQueueWriter obj's underlying member method code with example usage: obj.test_call() without return types