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New solution skill

cypress Because this error occurred during a 'before all' hook - how to get the real error

Extracts the real error hidden behind a Cypress before-all hook failure. Use when the output says Because this error occurred during a 'before all' hook without showing the cause. Covers running the hook body standalone, adding logging, and reading browser console artifacts. Not for hook timeouts or test-body failures.

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New solution skill

cypress We detected an uncaught exception from your application failing CI - how to fix

Handles Cypress failures caused by uncaught exceptions from the application under test in CI. Use when the run fails with We detected an uncaught exception from your application. Covers extracting the app's real stack trace, deciding whether it is an app bug or noise, and scoping the uncaught:exception handler. Not fo…

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New solution skill

cypress "A snapshot has not been taken for this command" flake when the app re-renders mid-assertion

Fixes the Cypress flake 'A snapshot has not been taken for this command' caused by the app re-rendering between the DOM snapshot and the assertion. Shows how to chain assertions off a single fresh query, stop holding element references across renders, and wait for the render to settle before asserting. Use when Cypres…

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New solution skill

cypress "Cannot read properties of null (reading 'setAttribute')" only in headless CI runs

Fixes the 'Cannot read properties of null (reading setAttribute)' TypeError that appears only in headless Cypress CI runs. Shows how to trace the null element from the stack, wait for the element before acting on it, and add a guard so the code fails loudly instead of crashing. Use when app code touches a DOM element …

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New solution skill

jest "TypeError: Cannot read properties of undefined (reading 'map')" only under --runInBand in CI

Debugs Jest "TypeError: Cannot read properties of undefined (reading 'map')" that only appears under --runInBand in CI. Explains how serial execution changes module state sharing versus parallel workers, and how to find the module-level state or mock that behaves differently in-band. Use when a test passes in parallel…

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