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Sinon

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use framework-agnostic spies, stubs, mocks, and fake timers to test JavaScript behavior

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Stars
9,756
Primary language
JavaScript
License
BSD-3-Clause
Repository last updated
Oct 5, 2026
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Overview

Sinon is a standalone JavaScript testing library for spies, stubs, and mocks. It can be added to an existing test framework to observe function calls, replace dependencies, verify expectations, and fake time-dependent behavior.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Key features

Use spies, stubs, and mocks without replacing the test framework

The README describes Sinon as standalone and test-framework agnostic, so projects can add the required test doubles to an existing runner.

Sources: [1]

Use ready-made fake timers for time-dependent code

Shipping ready-to-use timer fakes is listed as a project goal, helping tests separate time-dependent behavior from real elapsed time.

Sources: [1]

Best fit

Fits unit tests that need selective control over dependencies and calls

Sinon is useful when an existing test stack needs focused spying, stubbing, mocking, or timer control rather than a replacement testing framework.

Sources: [1]

Before adoption

Version 22.1.0 is an ES module package, so verify module resolution

The package declares type: module and exposes both import and require paths. Check the test runner and bundler configuration used by an existing codebase.

Sources: [2][3]

Official sources

  1. [1]Sinon v22.1.0 README(2026-10-06)
  2. [2]Sinon v22.1.0 package metadata(2026-10-06)
  3. [3]Sinon v22.1.0 changelog(2026-10-06)
  4. [4]Sinon BSD-3-Clause license(2026-10-06)
Supplemental curator note

Sinon fits unit tests that need selective call observation, dependency replacement, or timer control without replacing the existing test runner. Version 22.1.0 is an ES module package, so verify module resolution in the current toolchain.

Try it in 3 steps

  1. 1

    Get the source

    git clone --depth 1 https://github.com/sinonjs/sinon.git
  2. 2

    Enter the repository

    cd sinon
  3. 3

    Check the official steps

    Continue with the commands in the README Installation, Quick Start, or Getting Started section.

    find . -maxdepth 1 -iname 'README*' -exec sed -n '1,220p' {} \; -quit
Check the official README

Growth

Growth trends · Last 30 days

9,756 Stars

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GitHub data

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GitHub Topics

  • javascript
  • sinon
  • stub
  • stubs
  • tdd
  • test-driven-development
  • test-spies
  • unit-testing
Stars
9,756
Forks
807
Watchers
94
Open issues
69
Owner type
Organization
Primary language
JavaScript
Repository last updated
Oct 5, 2026
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