code: def shader_compatibility(self):
      return "desktop"
  
imports: import unittest
  import numpy
  from vispy import gloo, app
  from vispy.gloo.program import Program
  from vispy.testing import run_tests_if_main, requires_application
  from vispy.gloo.context import set_current_canvas, forget_canvas
label_desc: Use image node_id 1 for calling the DummyParser obj's underlying member method code with example usage: obj.shader_compatibility() and returns: str