James 1:2-4 Count it all joy, my brothers, when you meet trials of various kinds, (3) for you know that the testing of your faith produces steadfastness [endurance]. (4) And let steadfastness have its full effect, that you may be perfect and complete, lacking in nothing.
1 Corinthians 10:13 No temptation has overtaken you that is not common to man. God is faithful, and he will not let you be tempted beyond your ability, but with the temptation he will also provide the way of escape, that you may be able to endure it.
Testing produces what? Steadfastness [endurance], perfection, completeness with no lack. Is testing easy? No; testing often requires endurance “through” the trial not necessarily out of the trial. Remember that God does not tempt [to evil] but tests for our good and steadfastness. He refines us through the fire. God is sovereign over all for our good and His glory. See and example here:
Judges 3:1-4 Now these are the nations that the LORD left, to test Israel by them, that is, all in Israel who had not experienced all the wars in Canaan. (2) It was only in order that the generations of the people of Israel might know war, to teach war to those who had not known it before. (3) These are the nations: the five lords of the Philistines and all the Canaanites and the Sidonians and the Hivites who lived on Mount Lebanon, from Mount Baal-hermon as far as Lebo-hamath. (4) They were for the testing of Israel, to know whether Israel would obey the commandments of the LORD, which he commanded their fathers by the hand of Moses.
This testing was to see if Israel would truly follow the Lord (2:22; 3:4), as when God tested Abraham (Gen. 22:1) and Hezekiah (2 Chron. 32:31). In order to test the faithfulness of the Israelites, God chose not to immediately annihilate the nations (Judges 2:22-23). Israel, however, quickly failed the test. Through adversity, God was testing Israel in order to refine it.
What do we learn? Testing and trials are not to be desired but when they come, realize it is an opportunity for us to exercise [refine] our faith in the sovereign Lord.
Count it all joy [and all means all] – there is a purpose [Rom. 8:28]. Joy and happiness are not the same thing. We are not always happy but we are always joyful.