GraphQL Codegen plugin for building mock data

Redis client mock object for unit testing

Definition DSL components for the ContractCase contract testing suite

Reusable utilities to help level up NestJS Testing

A storybook addon to mock fetch/XHR request

Streams3, a browser compatible copy of the stream library from Node.js with circular dependencies removed

A JavaScript library to mock the local timezone.

XMLHttpRequest mock for testing

Mock Pusher.js in your JavaScript tests with ease

Simple, intuitive mocking of Node.js modules.

visx mock data

Library for mocking dependencies in Vitest with TypeScript without need to provide a path.

Mock websockets and assert complex websocket interactions with Vitest

TypeScript definitions for redux-mock-store

Mock infrastructure for AI application testing — LLM APIs, image generation, image editing, text-to-speech, transcription, audio translation, audio generation, video generation, embeddings, MCP tools, A2A agents, AG-UI event streams, vector databases, sea

Zod auto-mock object generator using Faker at @faker-js/faker

Easily unit test LaunchDarkly feature flagged components with jest

Simple utility to mock example objects based on JSON schema definitions

The mock serialport bindings

An easy way to mock a SignalR server which can send and receive messages during Cypress tests.