public void Channels_Verify()
{
var settingWrong1 = new ChannelOutput(0);
var settingWrong2 = new ChannelOutput(-1);
var setting = new ChannelOutput(1);
Assert.Throws <InvalidOperationException>(() => { var s = settingWrong1.GetAndValidateString(); });
Assert.Throws <InvalidOperationException>(() => { var s = settingWrong2.GetAndValidateString(); });
Assert.DoesNotThrow(() => { var s = setting.GetAndValidateString(); });
Assert.Equal(setting.GetAndValidateString(), "-ac 1");
}