memfs

In-memory file-system with Node's fs API.
v4.17.2 URL: https://unpkg.com/memfs@4.17.2/lib/index.js
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fsfilesystemfs.jsmemory-fsmemfsfilefile systemmountmemoryin-memoryvirtualtesttestingmockfsafile system accessnative file systemwebfscrudfsopfscasfscontent addressable storage

responselike

A response-like object for mocking a Node.js HTTP response stream
v3.0.0 URL: https://unpkg.com/responselike@3.0.0/index.js
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httphttpsresponsemocktestrequestresponselike

tinyspy

A minimal fork of nanospy, with more features
v4.0.3 URL: https://unpkg.com/tinyspy@4.0.3/dist/index.js
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spymocktypescriptmethod

sinon

JavaScript test spies, stubs and mocks.
v21.0.0 URL: https://unpkg.com/sinon@21.0.0/lib/sinon.js
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sinontesttestingunitstubspyfaketimeclockmockxhrassert

identity-obj-proxy

an identity object using ES6 proxies
v3.0.0 URL: https://unpkg.com/identity-obj-proxy@3.0.0/src/index.js
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proxyproxiesidentityjestmock