Analytics pipeline sorted every click correctly but sent none to Google Analytics
A website's analytics classified every user click accurately, yet none of the events reached Google Analytics, leaving its reports empty. The analytics tag loaded late, so events fired before it was configured were silently discarded without any error. A separate bug also prevented a pricing section's view counter from ever registering, because its visibility threshold was unreachable on the phones most readers use. Existing unit tests missed both problems because they only confirmed a function was called, not that data arrived at its destination. The author's lesson is to verify measurement changes on the deployed page, watching what the browser actually sends.
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