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Discussion on: Explain why developers are bad at testing their work, like I am five

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Ronald S

You want to bake a cake for the family.
You like it really sweet, so you want to add extra sugar.
Your brother says it will be too sweet.
You tone it down a bit.
The whole family loves the cake.

I would explain the metaphor but I guess you'll understand.
A developer builds something in a certain way because he believes that's the right way. A tester double-checks if he agrees and if it works the way he would expect.