code: func (m *MockSentPacketHandler) PeekPacketNumber(arg0 protocol.EncryptionLevel) (protocol.PacketNumber, protocol.PacketNumberLen) {
  	m.ctrl.T.Helper()
  	ret := m.ctrl.Call(m, "PeekPacketNumber", arg0)
  	ret0, _ := ret[0].(protocol.PacketNumber)
  	ret1, _ := ret[1].(protocol.PacketNumberLen)
  	return ret0, ret1
  }
docs: // PeekPacketNumber mocks base method