Silent test passes can hide bugs longer than outright failures, developer warns

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A software developer building the tapflow test runner discovered that a passing UI test can be more dangerous than a failing one after a login test silently tapped the wrong button for two weeks without triggering any alert. The issue arose because the test selector automatically picked the first matching element when multiple buttons shared the same label, masking a UI change after a redesign. To address this, tapflow's flow runner was updated to fail immediately and list all matching candidates whenever a selector resolves to more than one element, forcing developers to explicitly disambiguate using role or index qualifiers. The tool also eliminates fixed sleep timers in favour of condition-based waits with configurable deadlines, reducing flakiness caused by variable CI machine speeds. The post is part of a series on building a deterministic, YAML-driven mobile UI testing tool that avoids implicit guesses in every step of test execution.

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