Testing

12-month change compares the average of the last 4 weeks of downloads with the first 4 weeks of the 52-week series. Gzip size is for the whole package, as measured by Bundlephobia. "-" means the value has not been fetched.

• @mnajdova/enzyme-adapter-react-18JavaScript Testing utilities for React
• esmocha[Mocha](https://mochajs.org) wrapper with built-in [typescript](https://github.com/node-loaders/loaders/tree/main/workspaces/esbuild), built-in [expect](https://jestjs.io/docs/expect) with [mock](https://github.com/node-loaders/loaders/tree/main/workspace
• get-bin-pathGet the current package's binary path
• cli-testlabTest framework for CLI utilities
• @stdlib/number-float32-base-assert-is-almost-same-valueTest if two single-precision floating-point numbers are approximately the same value within a specified number of ULPs (units in the last place).
• twig-testing-librarySimple and complete Twig testing utilities that encourage good testing practices.
• hoodwinkA dead simple mock/stub module for Javascript
• automate-google-login-scraperEnd-to-end test harness for Google sign-in: persist a Playwright storageState once, reuse it everywhere, and replay it from a Cloudflare Workers Browser Rendering Durable Object
• mocha-standardIntegrate the JS standard to your Mocha tests
• wrapito🌯 🌯 Wrap you tests so that you can test both behaviour and components with less effort.
• pgmock2An NPM module for mocking a connection to a PostgreSQL database.
• lerna-aliasGet aliases for your lerna packages for the other tools
• validation-utilsValidation utilities
• @foundry-rs/forgeFast and flexible Ethereum testing framework
• typanicForced runtime type assertions for untrusted input — get the type you expect or throw, instead of silently coercing a wrong value to "" / 0 / false.
• @foundry-rs/forge-linux-amd64Fast and flexible Ethereum testing framework (Linux x64)
• very-happy-domLike a light-weight version of `happy-dom` powered by Bun.
• mongodb-memory-server-global-4.4MongoDB Server for testing (auto-download 4.4 version to ~/.cache/mongodb-binaries).
• @stuntman/clientStuntman - HTTP proxy / mock API client
• @decocms/parityE2E parity validator for site migrations. Compares prod vs cand and reports UI, functional, SEO, visual, and Web Vitals deltas with an LLM-ranked HTML report.
• pocket-regionAWS services like S3, DynamoDB, and Lambda inside Node or a browser tab, reached with the ordinary AWS SDK
• jest-tsdThe easiest way to test your TS types with Jest
• spawn-mockSimple mock for child_process.spawn
• constructive-testconstructive-test extends pgsql-test with Constructive platform defaults: auto-derived principal_id, role mappings, and platform-specific test helpers
• cloudflare-worker-mockMocks for the Cloudflare Worker API
• @async-fn/jestAdditional methods to jest.fn to introduce "late resolve" of promises returned by mock functions. This allows tests that read chronologically, like a story.
• zod-v4-mocksMock generator for zod v4
• vitest-mock-axiosAxios mock for Vitest
• cypress-xray-junit-reporterCypress Reporter | Enhances your Cypress test suite with the cypress-xray-junit-reporter a specialized custom reporter designed to seamlessly generating comprehensive XRay-compatible JUnit-style XML reports, complete with embedded screenshots on test fail
• vcr-testRecord your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
• wirepigBetter testing through the power of sockets.
• inboxtapA local email capture server and TypeScript SDK for testing verification links, magic links, OTPs, invitations, and password-reset emails.
• jest-tobetypeA jest matcher that allows you to test the expected type of a value
• jasmine-promise-wrapperPromise handling for jasmine
• cypress-redirect-browser-logWill connect to **chrome** debugging protocol and redirect logs to node process
• @test2doc/playwrightA reporter that generates docs based off playwright test files
• @cruglobal/graphql-ergonomockAutomatic mocking of GraphQL operations.
• @twin.org/entity-storage-connector-memoryIn-memory connector for local development, testing and short-lived workloads.
• @stdlib/number-float64-base-assert-is-almost-same-valueTest if two double-precision floating-point numbers are approximately the same value within a specified number of ULPs (units in the last place).
• vite-plugin-vitest-typescript-assert🔥 TypeScript type assertion plugin for vitest.
• express-request-mockA convenient wrapper for node-mocks-http which makes testing Express or Koa controllers and middleware easy.
• testreelProgrammatic video infrastructure for web apps
• json-server-authAuthentication middleware for JSON Server
• unexpected-streamnode.js streams plugin for the Unexpected assertion library
• @threenative/playtestScenario-driven playtest harness for Three.js games. Runs on plain Three.js with zero ThreeNative dependencies.
• istanbul-cobertura-badgerIstanbul test coverage report badger task.
• camouflage-serverEasily mock your webservices while testing frontends.
• noop-processCreate a noop (no operation) process and get the PID
• @overkill-dev/runOverkill run resolution and orchestration.
• unexpected-knockoutThis module extends the [Unexpected](https://github.com/unexpectedjs/unexpected) assertion library with integration for [Knockout](http://knockoutjs.org).

• selenium-webdriver vs wd
• @appium/types vs selenium-webdriver
• msw vs json-server
• @copilotkit/aimock vs mock-socket
• @appium/types vs wd
• mockttp vs ts-mockito
• mock-socket vs ts-mockito
• rewire vs ng-mocks
• msw vs miragejs
• codeceptjs vs playwright-bdd
• codeceptjs vs nightwatch
• mocha vs jasmine-core
• mock-socket vs ng-mocks
• fast-check vs rewire
• ts-jest vs @golevelup/ts-jest