code: def test_chrono_duration_roundtrip():
      from pybind11_tests import test_chrono3
      import datetime
  
      # Get the difference between two times (a timedelta)
      date1 = datetime.datetime.today()
      date2 = datetime.datetime.today()
      diff = date2 - date1
  
      # Make sure this is a timedelta
      assert isinstance(diff, datetime.timedelta)
  
      cpp_diff = test_chrono3(diff)
  
      assert cpp_diff.days == diff.days
      assert cpp_diff.seconds == diff.seconds
      assert cpp_diff.microseconds == diff.microseconds
  
label_desc: Use image node_id 3 for calling a global function with example usage: test_chrono_duration_roundtrip() without return types