Joyfulness through tribulation does mean we will be happy while we are going through troubles it means that it gives us the strength to carry on and helps during the time of need whether we are home, aboard or around town.

Romans 5:3-5 And not only so, but we glory in tribulations also: knowing that tribulation worketh patience; 4 And patience, experience; and experience, hope: 5 And hope maketh not ashamed; because the love of God is shed abroad in our hearts by the Holy Ghost which is given unto us.