It may be a difficult marriage, or a situation in which you must choose between what your will and God's will. It may loss of income, of reputation, of opportunity. It could be the betrayal of a friend, the death of a family member. I know that it doesn't sound like fun. Maybe it isn't what you want to hear.
Testing is never fun.
It isn't supposed to be. Abraham was not having fun on Mt. Moriah. Jesus was not having a picnic in His fast in the desert. At times God may seem very distant, perhaps even hostile. You will feel isolated and alone in your time of testing.