code: def _vispy_set_current(self):
      self.set_current = True
  
file_path: vispy/vispy/gloo/tests/test_context.py
imports: import gc
  from vispy.testing import assert_in, run_tests_if_main, assert_raises, assert_equal, assert_not_equal
  from vispy import gloo
  from vispy.gloo import GLContext, get_default_config
label_desc: Use image node_id 2 for calling the DummyCanvasBackend obj's underlying member method code with example usage: obj._vispy_set_current() without return types