new_contents: import pytest
  import numpy as np
  import bokeh
  
  
  def test_bokeh(dtm):
      pass  
  
  
  @pytest.fixture()
  def dtm():
      dtm = DTM()
      country1 = Country()
      country1.border_x = [np.array([1, 3, 3, 1])]
      country1.border_y = [np.array([0, 0, 1, 1])]
  
      country2 = Country()
      country2.border_x = [np.array([1, 3, 3, 1])]
      country2.border_y = [np.array([1, 1, 2, 2])]
  
      country3 = Country()
      country3.border_x = [np.array([0, 2, 2, 0])]
      country3.border_y = [np.array([2, 2, 3, 3])]
  
      country4 = Country()
      country4.border_x = [np.array([2, 4, 4, 2])]
      country4.border_y = [np.array([2, 2, 3, 3])]
      dtm.countries =  {
          "a": country1,
          "b": country2,
          "c": country3,
          "d": country4
      }
      return dtm
  
  
subject: test bokeh