memfs

In-memory file-system with Node's fs API.

v4.14.0 URL: https://unpkg.com/memfs@4.14.0/lib/index.js

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fs filesystem fs.js memory-fs memfs file file system mount memory in-memory virtual test testing mock fsa file system access native file system webfs crudfs opfs casfs content addressable storage

sinon

JavaScript test spies, stubs and mocks.

v19.0.2 URL: https://unpkg.com/sinon@19.0.2/lib/sinon.js

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sinon test testing unit stub spy fake time clock mock xhr assert

msw

Seamless REST/GraphQL API mocking library for browser and Node.js.

v2.6.4 URL: https://unpkg.com/msw@2.6.4/lib/core/index.js

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api mock mocking worker prototype server service handler testing front-end back-end

tinyspy

A minimal fork of nanospy, with more features

v3.0.2 URL: https://unpkg.com/tinyspy@3.0.2/dist/index.cjs

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spy mock typescript method

node-mocks-http

Mock 'http' objects for testing Express, Next.js and Koa routing functions

v1.16.1 URL: https://unpkg.com/node-mocks-http@1.16.1/lib/http-mock.js

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mock stub dummy nodejs js testing test http http mock