old_contents: """ Tests to ensure that base vispy namespace functions correctly,
  including configuration options.
  """
  
new_contents: """ Tests to ensure that base vispy namespace functions correctly,
  including configuration options.
  """
  
  import vispy
  from vispy.testing import requires_application
  
  @requires_application('pyside')
  def test_use():
      vispy.use('')  # Should do nothing
      vispy.use('pyside')  # So this should always work
      vispy.use('desktop')
      vispy.use('pyside desktop')
  
subject: add test for vispy.use