code: def test_chrono_system_clock_roundtrip():
      date1 = datetime.datetime.today()
  
      # Roundtrip the time
      date2 = m.test_chrono2(date1)
  
      # The returned value should be a datetime
      assert isinstance(date2, datetime.datetime)
  
      # They should be identical (no information lost on roundtrip)
      diff = abs(date1 - date2)
      assert diff == datetime.timedelta(0)
  
file_path: coremltools/deps/pybind11/tests/test_chrono.py
imports: import datetime
  import pytest
  import env
  from pybind11_tests import chrono
label_desc: Use image node_id 2 for calling a global function with example usage: test_chrono_system_clock_roundtrip() without return types