In this episode, Lucas and Luna dig into a subtle but devastating class of bugs—state transitions. Most test automation scripts assume the application is in a known state when they start, but real users jump between screens, reload mid-flow, or leave a session open overnight. Lucas explains how a single missing state check caused a major retailer to discount products by 90 percent during a holiday sale, and why the fix wasn't more tests but a state machine model. Luna brings in a healthcare startup story where a broken state machine locked patients out of critical data. They discuss practical patterns: modeling states as explicit enums, using state transition coverage instead of line coverage, and why UI tests should start from a reset state not a cached one. This episode is for QA engineers who have ever seen a test pass in isolation but fail in a suite—and want to know why.

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