Latest fixes and solutions for jest errors on FixDevs.https://fixdevs.com/enThu, 26 Mar 2026 00:00:00 GMThttps://fixdevs.com/blog/jest-setup-file-not-working/https://fixdevs.com/blog/jest-setup-file-not-working/How to fix Jest setup file issues — setupFilesAfterFramework vs setupFiles, global mocks not applying, @testing-library/jest-dom matchers, module mocking in setup, and TypeScript setup files.Thu, 26 Mar 2026 00:00:00 GMTjesttestingjavascripttypescriptdebuggingFixDevshttps://fixdevs.com/blog/jest-async-test-timeout/https://fixdevs.com/blog/jest-async-test-timeout/How to fix Jest async test timeouts — missing await, unresolved Promises, done callback misuse, global timeout configuration, fake timers, and async setup/teardown issues.Sun, 22 Mar 2026 00:00:00 GMTjesttestingjavascripttypescriptdebuggingFixDevshttps://fixdevs.com/blog/jest-coverage-not-collected/https://fixdevs.com/blog/jest-coverage-not-collected/How to fix Jest coverage not collecting all files — collectCoverageFrom config, coverage thresholds, Istanbul ignore comments, ts-jest setup, and Babel transform issues.Sun, 22 Mar 2026 00:00:00 GMTjesttestingjavascripttypescriptdebuggingFixDevshttps://fixdevs.com/blog/jest-fake-timers-not-working/https://fixdevs.com/blog/jest-fake-timers-not-working/How to fix Jest fake timers not working — useFakeTimers setup, runAllTimers vs advanceTimersByTime, async timers, React testing with act(), and common timer test mistakes.Sat, 21 Mar 2026 00:00:00 GMTjestjavascripttypescripttestingdebuggingFixDevshttps://fixdevs.com/blog/jest-module-mock-not-working/https://fixdevs.com/blog/jest-module-mock-not-working/How to fix Jest module mocks not working — hoisting behavior, ES module mocks, factory functions, mockReturnValue vs implementation, and clearing mocks between tests.Sat, 21 Mar 2026 00:00:00 GMTjestjavascripttypescripttestingdebuggingFixDevshttps://fixdevs.com/blog/jest-esm-error/https://fixdevs.com/blog/jest-esm-error/How to fix Jest failing with 'Cannot use import statement outside a module' — configuring Babel transforms, using experimental VM modules, migrating to Vitest, and handling ESM-only packages.Fri, 20 Mar 2026 00:00:00 GMTjestjavascripttypescripttestingnodejsFixDevshttps://fixdevs.com/blog/jest-snapshot-outdated/https://fixdevs.com/blog/jest-snapshot-outdated/How to fix Jest snapshot failures — updating outdated snapshots, removing obsolete ones, fixing inline snapshots, preventing brittle snapshot tests, and managing snapshots in CI.Thu, 19 Mar 2026 00:00:00 GMTjestjavascripttypescripttestingdebuggingFixDevshttps://fixdevs.com/blog/jest-mock-not-working/https://fixdevs.com/blog/jest-mock-not-working/How to fix jest.mock() not intercepting module calls — why mocks are ignored, how to correctly mock ES modules, default exports, named exports, and fix hoisting issues in Jest tests.Mon, 16 Mar 2026 00:00:00 GMTjesttestingjavascripttypescriptdebuggingFixDevshttps://fixdevs.com/blog/jest-test-timeout/https://fixdevs.com/blog/jest-test-timeout/How to fix Jest 'Exceeded timeout of 5000ms for a test' errors caused by unresolved promises, missing done callbacks, async/await mistakes, and slow database or network calls in tests.Thu, 12 Mar 2026 00:00:00 GMTjestjavascripttestingnodejsasyncFixDevshttps://fixdevs.com/blog/jest-cannot-find-module/https://fixdevs.com/blog/jest-cannot-find-module/How to fix the Jest 'Cannot find module' error by configuring moduleNameMapper, moduleDirectories, tsconfig paths, and resolving ESM, monorepo, and dependency issues.Tue, 10 Mar 2026 00:00:00 GMTjestjavascripttestingFixDevs