Latest fixes and solutions for testing errors on FixDevs.https://fixdevs.com/enThu, 09 Apr 2026 00:00:00 GMThttps://fixdevs.com/blog/hypothesis-not-working/https://fixdevs.com/blog/hypothesis-not-working/How to fix Hypothesis errors — Unsatisfied assumption, Flaky test detected, HealthCheck data_too_large, strategy composition failing, example database stale, settings profile not found, and stateful testing errors.Thu, 09 Apr 2026 00:00:00 GMTpythonhypothesisproperty-based-testingpytesttestingdebuggingFixDevshttps://fixdevs.com/blog/locust-not-working/https://fixdevs.com/blog/locust-not-working/How to fix Locust errors — no locustfile found, User class not detected, worker connection refused, distributed mode throughput lower than single-node, StopUser exception, FastHttpUser vs HttpUser, and headless CSV reports.Thu, 09 Apr 2026 00:00:00 GMTpythonlocustload-testingperformancetestingdebuggingFixDevshttps://fixdevs.com/blog/selenium-not-working/https://fixdevs.com/blog/selenium-not-working/How to fix Selenium errors — WebDriverException session not created, NoSuchElementException element not found, StaleElementReferenceException, TimeoutException waiting for element, headless Chrome crashes, and driver version mismatch.Thu, 09 Apr 2026 00:00:00 GMTpythonseleniumweb-scrapingtestingautomationdebuggingFixDevshttps://fixdevs.com/blog/tox-not-working/https://fixdevs.com/blog/tox-not-working/How to fix Tox errors — ERROR cannot find Python interpreter, tox.ini config parsing error, allowlist_externals required, recreating environments slow, pyproject.toml integration, and matrix env selection.Thu, 09 Apr 2026 00:00:00 GMTpythontoxtestingci-cdpytestdebuggingFixDevshttps://fixdevs.com/blog/supertest-not-working/https://fixdevs.com/blog/supertest-not-working/How to fix Supertest HTTP testing issues — Express and Fastify setup, async test patterns, authentication headers, file uploads, JSON body assertions, and Vitest/Jest integration.Sun, 29 Mar 2026 00:00:00 GMTtypescripttestingbackenddebuggingFixDevshttps://fixdevs.com/blog/cypress-not-working/https://fixdevs.com/blog/cypress-not-working/How to fix Cypress issues — element selection strategies, async command chaining, cy.intercept for network stubbing, component testing, authentication handling, and flaky test debugging.Sat, 28 Mar 2026 00:00:00 GMTjavascripttypescripttestingdebuggingFixDevshttps://fixdevs.com/blog/msw-not-working/https://fixdevs.com/blog/msw-not-working/How to fix Mock Service Worker issues — browser vs Node setup, handler registration, worker start timing, passthrough requests, and common MSW v2 API changes from v1.Fri, 27 Mar 2026 00:00:00 GMTjavascripttypescripttestingfrontenddebuggingFixDevshttps://fixdevs.com/blog/playwright-not-working/https://fixdevs.com/blog/playwright-not-working/How to fix Playwright test issues — locator strategies, auto-waiting, network mocking, flaky tests in CI, trace viewer debugging, and common headless browser setup problems.Fri, 27 Mar 2026 00:00:00 GMTjavascripttypescripttestinge2edebuggingFixDevshttps://fixdevs.com/blog/storybook-not-working/https://fixdevs.com/blog/storybook-not-working/How to fix Storybook issues — CSF3 story format, addon configuration, webpack vs Vite builder, decorator setup, args not updating component, and Storybook 8 migration problems.Fri, 27 Mar 2026 00:00:00 GMTjavascriptreactfrontendtestingdebuggingFixDevshttps://fixdevs.com/blog/go-testing-not-working/https://fixdevs.com/blog/go-testing-not-working/How to fix Go testing issues — test function naming, table-driven tests, t.Run subtests, httptest, testify assertions, and common go test flag errors.Thu, 26 Mar 2026 00:00:00 GMTgotestingbackenddebuggingbest-practicesFixDevshttps://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/spring-boot-test-not-working/https://fixdevs.com/blog/spring-boot-test-not-working/How to fix Spring Boot test issues — @SpringBootTest vs test slices, MockMvc setup, @MockBean vs @Mock, test context caching, and common test configuration mistakes.Thu, 26 Mar 2026 00:00:00 GMTjavaspringtestingbackenddebuggingFixDevshttps://fixdevs.com/blog/react-testing-library-not-finding-element/https://fixdevs.com/blog/react-testing-library-not-finding-element/How to fix React Testing Library query failures — getByRole vs getByText, async queries, accessible names, waitFor patterns, custom queries, and common selector mistakes.Wed, 25 Mar 2026 00:00:00 GMTreacttestingjavascripttypescriptdebuggingFixDevshttps://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/vitest-setup-not-working/https://fixdevs.com/blog/vitest-setup-not-working/How to fix Vitest configuration not taking effect — why setupFiles don't run, globals are undefined, mocks don't work, and how to configure Vitest correctly for React, Vue, and Node.js projects.Tue, 17 Mar 2026 00:00:00 GMTvitesttestingjavascripttypescriptdebuggingFixDevshttps://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 GMTjestjavascripttestingFixDevshttps://fixdevs.com/blog/pytest-fixture-not-found/https://fixdevs.com/blog/pytest-fixture-not-found/How to fix pytest errors like 'fixture not found', 'ERRORS collecting test', or 'no tests ran' caused by missing conftest.py, wrong scope, or import issues.Sat, 28 Feb 2026 00:00:00 GMTpythonpytesttestingFixDevs