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

@webext-core/fake-browser

An in-memory implementation of webextension-polyfill for testing. Supports all test frameworks (Vitest, Jest, etc)
v1.3.2 URL: https://unpkg.com/@webext-core/fake-browser@1.3.2/lib/index.cjs
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web-extensionbrowser-extensionchrome-extensionwebextweb-extchromefirefoxsafaribrowserextensiontestingvitejestmockfakewebextension-polyfill

xhr-mock

Utility for mocking XMLHttpRequest.
v2.5.1 URL: https://unpkg.com/xhr-mock@2.5.1/lib/index.js
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mockxhrtestfakerequestajaxbrowserxmlhttprequestjquerysuperagentaxios

nise

Fake XHR and server
v6.1.1 URL: https://unpkg.com/nise@6.1.1/lib/index.js
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testtestingfakemockxhrserver

@ngneat/falso

All the Fake Data for All Your Real Needs
v8.0.1 URL: https://unpkg.com/@ngneat/falso@8.0.1/index.cjs.js
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fakefake datarandom datamock datajs mockmocks