testdouble/testdouble.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1428 stars · 139 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

testdouble.js (td.js) is a minimal, opinionated test double library for JavaScript that provides stubbing, spying, and verification for test-driven development. It works in both Node.js and browsers and is agnostic to the test framework used.

Use cases

• mock dependencies in JavaScript unit tests
• stub functions and objects for TDD
• spy on function calls and verify interactions
• replace sinon.js with a simpler mocking library
• fake out API or module dependencies in browser tests

When to choose

• you practice TDD and want terse, readable test doubles
• you want a test-framework-agnostic mocking library (Jest, Mocha, Jasmine, Tape, etc.)
• you prefer a minimal API over heavyweight mocking frameworks

When to avoid

• you need deep integration with a specific framework's mocking ecosystem
• you need extensive features like fake timers or module mocking built in
• you need a library under very active development

Facets

library · maturity maintenance

testing mocking testing developer-tools browser cross-platform test-doubles tdd spies stubs sinon-alternative test-framework-agnostic javascript nodejs

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