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It consistently amazes me how many developers write code without thinking about tests. I've entered large scale projects, where I had to write code that interacted with a number of other components, and when asking "What happens when (possible failure case)" I get a shrug, "We've never seen that happen in development", and when I ask "Okay, how can I mock that failure case out sufficiently that we can see what the system does, and make sure it works okay?" I get a deer in the headlights look back.

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