class_docstr: DataQueue test
code: def test_queu_with_empty_ques(self):
      que = DataQueue(
          [("image", ColumnType.QUEUE), ("vec", ColumnType.QUEUE)]
      )
      que.put(("test", Empty()))
      que.put(("test", Empty()))
      self.assertEqual(que.size, 0)
      que.seal()
      self.assertEqual(que.size, 2)
  
imports: import unittest
  import threading
  import time
  from functools import partial
  from towhee.runtime.data_queue import DataQueue, ColumnType, Empty
label_desc: Use image node_id 25 for calling the TestDataQueue obj's underlying member method code with example usage: obj.test_queu_with_empty_ques() without return types