code: def test_context(setup):
      def func():
          ctx = get_context()
          assert ctx is not None
  
      # no error should happen
      mr.spawn(func).execute()
  
      # context should be reset after execution
      # for test backend(test://xxx),
      # the worker pool and client are in the same process
      # if context is not reset, get_context() will still get one
      assert get_context() is None
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_context(setup) without return types