Developer builds Madrid metro library search tool with self-monitoring test system

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A developer created librometro.es, a free tool that lets users check book availability across the six remaining Bibliometro lending points inside Madrid metro stations, including return dates for borrowed copies. The official Madrid Community catalogue was considered too difficult to navigate, prompting the project, which was also designed to meet accessibility standards within three interactions. Beyond the search tool, the developer built a snapshot-based monitoring system that records observable app states as baselines and flags any changes on subsequent runs, without blocking builds or making pass/fail judgements. The approach caught a real bug where shared links correctly opened a station panel on mobile but silently ignored the URL parameter on desktop. The developer also tracked false positives and false negatives from the monitoring tool itself, fixing issues such as mid-animation captures and silent null mismatches in selectors.

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