You are right about what you are asking about:
So according to the Lord Jesus Christ himself - He says that a person must take up their own cross: (Matthew 16:24-26) And the disciples went through many challenges, including being put in prison for being Christian. Faced many different challenges going to different provinces, and traveling around the land of Israel, all 12 of the Apostles would go and teach about the good news of the coming of the kingdom the lost sheep of Israel.
When you ask about suffering or testing of the Faith of a Christian:
Looking at Romans 5:
Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ, 2 through whom we have gained access by faith into this grace in which we now stand. And we boast in the hope of the glory of God. 3 Not only so, but we also glory in our sufferings, because we know that suffering produces perseverance; 4 perseverance, character; and character, hope. 5 And hope does not put us to shame, because God’s love has been poured out into our hearts through the Holy Spirit, who has been given to us.
Suffering for the sake of Christ Jesus - because not everyone will love you, or accept you; also means us today in this life suffer for the sake of Christ because of that when people may not accept you for just simply being a Christian, and believer in God and Jesus Christ. ~ Pray for those people would be the response of a believer.
Suffering ups and downs of experiences in life; with or without God produces your character: Having God in your life allows a believers character to be conformed into the image of Christ Jesus ~ starting to live by the spirit more; which also produces a person who preservers and continues on having hope and trust in God because of people maybe rejecting you, or not having anything to do with you, or whatever it is. Continue to trust in God and your character of your experience will continue to grow. Hope brings no shame to believer because of the Holy spirit that has been given to them because of their faith, and the Love God has shed into a believers heart.
There are promises of rewards in heaven;
Reward - Thompson Chain Reference - : Suffering endured ~ Notice suffering : Thinking about this word and Christianity is funny because it one of the least expected notions that is of suffering for Christ.
~ Though because of Christ Jesus we understand he lives with in us as believers (Galatians 2:20), and because of the holy spirit/spirit of Christ we can have (Galatians 5:19-26), a life by living by the spirit instead of the flesh ~ though it takes faith and some may disagree or not believe any of these things are possible.
There are promises of eternal life:
Eternal - Thompson Chain Reference -
There are promises of spiritual resurrection
Resurrection, Spiritual - Thompson Chain Reference -
Resurrection - Thompson Chain Reference -
There are promises of justification by faith:
Justification - Thompson Chain Reference -
Always will be about the Lord Jesus Christ and what He did for mankind on the cross; and being risen again 3 days later by God ~ Imo; never praise or believe me always check the bible and see what it has to say! Take care unto you all and your families.