new_contents: import unittest
  
  from kiva.tests.drawing_tester import DrawingImageTester
  from kiva.gl import GraphicsContext
  
  
  class TestGLDrawing(DrawingImageTester, unittest.TestCase):
  
      def create_graphics_context(self, width, height):
          return GraphicsContext((width, height))
  
  
  if __name__ == "__main__":
      unittest.main()
  
subject: add testcase for the gl backend