code: def test_expand_event_list():
      expanded_events = expand_events(
          event_list, left_expand="1min", right_expand="3min"
      )
      assert expanded_events == [
          (
              pd.Timestamp("2017-1-1 19:59:00"),
              pd.Timestamp("2017-1-1 20:11:59"),
          ),
          (
              pd.Timestamp("2017-1-1 20:29:00"),
              pd.Timestamp("2017-1-1 20:33:00"),
          ),
          (
              pd.Timestamp("2017-1-1 20:59:00"),
              pd.Timestamp("2017-1-1 21:09:59"),
          ),
      ]
  
file_path: adtk/tests/test_expand_events.py
imports: import pandas
  from adtk.data import expand_events
label_desc: Use image node_id 5 for calling a global function with example usage: test_expand_event_list() without return types