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The bug lives at the fence line
Overview
Where one assumption drops the baton
Software has edges. Not metaphorical ones — actual edges, where one rule ends and another begins. The field that accepts a name: what does it do with zero characters? With one? With two hundred and fifty-six? The list that paginates at fifty items: what does it do with forty-nine, with fifty, with fifty-one? Boundary testing is the practice of standing at exactly those edges and looking down. Most bugs don't live in the middle of the field, where the code is comfortable and well-tested. They live at the fence line, where one assumption hands off to another and sometimes drops the baton.
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Break it down
A 4,000-character paste and a spinning page
We had a search bar that worked beautifully — fast, clean, accurate — for any query a normal person would type. The day it went down was the day someone pasted in a 4,000-character URL from a marketing email by accident. The search input had no length limit; the search service did, but failed silently. The page just spun forever. Boundary thinking would have caught it in thirty seconds: what happens at one character, what happens at ten thousand. Instead, it took a real user, a confused support ticket, and an afternoon of debugging.
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A little simpler
Practical tips for anyone who wants to try to QA on their own
For every input field, try: empty, one character, very long, with weird characters (emoji, quotes, special symbols)
For every list or counter: try zero items, one item, the maximum allowed, one over the maximum
For every date: try yesterday, today, far future, year 1900
The pattern: just above, just at, just below every limit you can name
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