public void TestFrom()
        {
            var setting = new SerialPortSetting();

            setting.AssignFrom("COM1,9600,7,Two");
            Assert.Equal("COM1", setting.PortName);
            Assert.Equal(9600, setting.BaudRate);
            Assert.Equal(7, setting.DataBits);
            Assert.Equal(StopBits.Two, setting.StopBits);
        }