code: def test_travel_mode(self):
      layer = Directions(self.start, self.end, travel_mode="BICYCLING")
      assert layer.travel_mode == "BICYCLING"
  
imports: import unittest
  import pytest
  import traitlets
  from ..directions import Directions, DEFAULT_STROKE_COLOR
label_desc: Use image node_id 13 for calling the DirectionsLayer obj's underlying member method code with example usage: obj.test_travel_mode() without return types