def METHOD_NAME():
    proc = PopenWorker(register_ffi)
    # call python function via ffi
    initargs = [0]
    proc.send(call_py_ffi, initargs)
    assert proc.recv() == initargs[0]
    # call cpp function via ffi
    initargs = [1]
    proc.send(call_cpp_ffi, initargs)
    assert proc.recv() == initargs[0]
    # call python function from cpp function via ffi
    initargs = [2]
    proc.send(call_cpp_py_ffi, initargs)
    assert proc.recv() == initargs[0]