Developer fixes overly broad error guard in open-source test automation tool

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A developer building TestFlow Agent, an open-source tool that converts plain-English test cases into automated tests, discovered a flawed error-handling guard in the backend code. The guard was designed to return a friendly 503 error when the tool's live browser feature was run in a Docker environment lacking a display server. However, the string-matching condition included the phrase 'has been closed', which Playwright also throws for unrelated failures like crashed contexts or killed browsers, causing those errors to be wrongly diagnosed as display issues. The fix narrowed the regex to match only genuine display-related markers such as 'XServer', 'X server', and '$DISPLAY', ensuring unrelated Playwright errors surface correctly. The bug was caught during an AI-assisted code review via GitHub Copilot before the pull request was merged.

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ProgrammingDEV Community ·

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