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And, if they get stuck because the task is particularly challenging, you get some insight into how they ask for help, how they talk themselves through a problem, how they interact with others when frustrated. The goal isn't to stump them, but it shows how they might act at work.
In fact, you could just say that you’re testing their debug skills because for the first few months all they’ll do is fix bugs. That’s the real job they’ll do so the test is testing what they’ll do. Being forced to close bugs also teaches them the code base, the tech, process.
