Fail fast, fail early — we’ve all heard the motto. Still, it’s frustrating when you’ve written a beautiful piece of code, just to realize that it doesn’t work as you’d expected. That’s where unit tests come in. Checking each piece of your code helps you localize and fix your bugs. But not all bugs are created the same. Some bugs are unexpected, not obvious to see at all, and hard to fix even for experienced developers. These are more likely to occur in large and complex projects, and spotting them early can save you a ton of time later on. Other bugs…
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