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.

• jest-serializer-ansi-escapesJest snapshot serializer for ANSI escape sequences
• @depay/web3-mock-evmJavaScript library to mock web3 responses either by emulating web3 wallets or web3 RPC requests.
• skin-deepTesting helpers for use with React's shallowRender test utils.
• @nestia/e2eE2E test utilify functions
• assumeExpect-like assertions that works seamlessly in node and browsers
• @remcovaes/web-test-runner-vite-plugin@web/test-runner plugin to allow the build to be done by Vite
• @web/test-runner-visual-regressionWeb test runner visual regression
• chai-xmlXml assertions for Chai
• jest-it-upAutomatically bump up global Jest thresholds whenever coverage goes above them
• nodemockSimple Yet Powerful Mocking Framework for NodeJs
• cypress-fill-commandA Cypress command for fill inputs
• @testing-library/jasmine-domCustom Jasmine matchers for testing DOM elements
• @web/test-runner-puppeteerPuppeteer browser launcher for Web Test Runner
• chomaRandom ordering for mocha
• @kpmck/ag-grid-coreFramework-agnostic AG Grid DOM helpers for Node-based test tooling
• jasmine-browser-runnerServe and run your Jasmine specs in a browser
• @testdeck/coreCore framework for decorator based object oriented testing
• tdd-guardAutomated Test-Driven Development enforcement for Claude Code
• dynamodb-localhostDynamodb local plugin for devops
• jest-mock-randomMath.random() as a deterministic jest mock function
• unist-util-assertunist utility to assert nodes
• ember-qunit-nice-errorsBabel plugin that gives message-less QUnit assertions a message: their own source text.
• @quramy/jest-prisma-nodeIt's same to [@quramy/jest-prisma](https://github.com/Quramy/jest-prisma) environment except inheriting jest-environment-node.
• mocksSet of mock modules for easy testing (fs, http)
• @jedmao/redux-mock-storeA mock store for testing your redux async action creators and middleware
• phone-number-generator-jsGenerates a random phone number following the E.164 international standard
• mocha-phantomjs-coreRun client-side mocha tests in phantomjs or slimerjs
• givensEasy test setup without side effects
• babel-plugin-ava-throws-helperBabel plugin for protecting against improper use of `t.throws()` in AVA
• @testcontainers/mariadbMariaDB module for Testcontainers
• @vizzly-testing/honeydiffHigh-performance image diffing for Node.js - Native bindings to Honeydiff Rust library
• chai-colorsColor assertions for chai
• @stdlib/assert-is-nodeCheck if the runtime is Node.js.
• vitest-nativeRun real React Native tests under Vitest. One install, zero config.
• @stdlib/assert-is-nullTest if a value is null.
• @stdlib/assert-is-browserCheck if the runtime is a web browser.
• @inbox-zero/emulateLocal drop-in replacement services for CI and no-network sandboxes
• @stdlib/assert-is-node-writable-stream-likeTest if a value is Node writable stream-like.
• @stdlib/assert-is-node-stream-likeTest if a value is Node stream-like.
• jest-react-hooks-shallowReact Hooks for shallow rendering
• @web/rollup-plugin-import-meta-assetsRollup plugin that detects assets references relative to modules using patterns such as `new URL('./path/to/asset.ext', import.meta.url)`. The assets are added to the rollup pipeline, allowing them to be transformed and hash the filenames.
• @serenity-js/serenity-bddSerenity/JS reporting module that produces detailed Serenity BDD test reports and living documentation, enhancing transparency and traceability of test results
• @better-auth/test-utilsTesting utilities for Better Auth adapter development
• minijasminenodeSuper simple wrapper around Jasmine 1.3 for Node
• diff-coverA Tool to Show Code Coverage for Modified Lines in a Diff
• @mailsac/apiOfficial Mailsac API client library
• @polymer/test-fixtureA simple element to fixture DOM for tests
• unexpected-sinonThis module extends the [Unexpected](https://github.com/unexpectedjs/unexpected) assertion library with integration for the [Sinonjs](http://sinonjs.org/) mocking library.
• @accesslint/vitestAccessibility assertions for Vitest — toBeAccessible() matcher powered by AccessLint
• cypress-html-validateCypress plugin for html-validate

• 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