code: func (m *MockOpener) Open(arg0, arg1 []byte, arg2 protocol.PacketNumber, arg3 []byte) ([]byte, error) {
  	m.ctrl.T.Helper()
  	ret := m.ctrl.Call(m, "Open", arg0, arg1, arg2, arg3)
  	ret0, _ := ret[0].([]byte)
  	ret1, _ := ret[1].(error)
  	return ret0, ret1
  }
docs: // Open mocks base method