class_docstr: Test pipelines contain different kinds of node.
class_docstr_tok: ["Test","pipelines","contain","different","kinds","of","node","."]
code: def test_less_data(self):
      runtime_pipeline = RuntimePipeline(self.dag_dict)
      timestamp = [0, 1000, 2000, 3000, 4000, 5000]
      result = runtime_pipeline([1, 1, 1, 1], timestamp)
      for i in range(6):
          self.assertEqual(
              result.get(),
              [
                  1 if i < 4 else 0,
                  3 if i == 0 else 1 if i == 1 else Empty(),
                  timestamp[i],
              ],
          )
  
imports: import unittest
  import copy
  from itertools import zip_longest
  from towhee.runtime.runtime_pipeline import RuntimePipeline
  from towhee.runtime.data_queue import Empty
label_desc: Use image node_id 5 for calling the TestTimeWindowPipeline obj's underlying member method code with example usage: obj.test_less_data() without return types