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Developer finds three CI tests were passing for entirely wrong reasons

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A software developer discovered that three separate tests in their CI suite had been showing false green results, each due to a distinct underlying flaw. One test was comparing string lengths rather than actual feature behavior, meaning it had never genuinely validated the functionality it claimed to cover. A second test designed to simulate Windows behavior was written in a way that only held true on macOS, causing it to fail correctly when run on actual Windows machines. A third test produced a misleading performance regression signal on Windows because the OS timer resolution caused near-zero durations to be recorded as exactly zero, skewing ratio calculations. All three issues were uncovered only when the code ran on an external platform during a release cycle, highlighting how environment-specific assumptions can silently undermine test reliability.

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