I wrote 187 tests for a Chrome extension. The three bugs that mattered were invisible to all of them.

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My unit tests were green. My integration tests were green. The feature was broken in a way that produced no error, no warning, and no visual clue that anything was wrong. The feature was a CSS difference blend mode, used to compare a design mockup against a live page: matching pixels turn black, so only the differences light up. Mine turned nothing black.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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