Developer finds 7 bugs in his own UI-auditing tool while testing it on new sites

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A developer who built a web UI auditing tool — designed to catch contrast issues, small touch targets, and clipped text — discovered seven bugs in the tool itself after running it against three unfamiliar websites. The bugs were not logic errors within individual functions, but inconsistencies between separate pieces of code that each worked correctly in isolation, such as duplicate label-building logic and a stale list defining what counted as a 'finding'. One flaw caused the tool to simultaneously report a UI problem and declare the same screen clean, because the detection engine had grown beyond a hand-maintained checklist. Another issue caused button labels to display raw icon-font glyph names like 'light_mode' instead of human-readable text, affecting labels across dozens of generated report cards. The developer concluded that this class of bug — arising from disagreement between two independently correct components — is structurally difficult for unit tests to catch and is best exposed through real-world use on unseen inputs.

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