Why Developers Are Poor Testers and What Can Be Done About It

The page argues that developers are often weak testers because they are attached to their own code, tend to turn complex problems into simple implementations, and focus on making things work rather than finding ways they fail. It also says they miss small details and often lack an end-to-end view of how users will work with a product.

Reading notes

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• Developers can be blind to flaws in their own code because they are too close to it.
• Their job usually pushes them toward simplifying requirements into workable code, while testing asks them to think through complex failure cases.
• They are trained to focus on the positive scenario, but testing requires looking for weak spots and breakable points.
• They may notice patterns more easily than hidden mistakes, while testers are more inclined to find what breaks the pattern.
• Many developers do not know enough about real users or the full system to predict how customers will actually use the product.
• Better testing starts by treating testing seriously instead of seeing it as a punishment.
• Developers should recognize their own limitations and ask for help or learn what they need.
• Testing should be planned with attention to positive and negative scenarios, user behavior, checklists, and heuristics.
• The page closes by saying testing remains part of programming work and should be cared about because the code is yours.