Lesson 1 · A check that can fail · step 2 of 901Read02Break it on purpose03Task 104Task 205Make it fail on the wrong result06Task 307Task 408Recap09TakeawayReadBreak it on purposeLog in to read this lesson. A free account opens the introductory chapter.←Why a check earns trust only after you have seen it failPick the better test of a check→