Sinon.JS

Test spies, stubs and mocks for JavaScript.

EstablishedOpen SourceLow lock-in
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Pricing

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Flat rate

Adoption

→Stable

License

Open Source

Data freshness

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Overview

What is Sinon.JS?

Sinon.JS is a powerful library that provides test spies, stubs, and mocks to help developers write better unit tests by isolating the code under test from its dependencies. It's essential for ensuring robust testing in JavaScript applications.

Key differentiator

“Sinon.JS stands out with its comprehensive suite of tools for creating test doubles and verifying function behavior, making it a go-to choice for rigorous unit testing in JavaScript applications.”

Capability profile

Strength Radar

Test spies for t…Stubs to replace…Mocks for creati…Flexible asserti…Extensive docume…

Honest assessment

Strengths & Weaknesses

↑ Strengths

Test spies for tracking function calls and their arguments.

Stubs to replace functionality with test doubles.

Mocks for creating fake objects that mimic real ones.

Flexible assertion methods for verifying behavior.

Extensive documentation and community support.

Fit analysis

Who is it for?

✓ Best for

JavaScript developers who need to isolate their code for unit testing.

Teams working on large JavaScript applications where dependency isolation is crucial.

Developers looking for a comprehensive set of tools for mocking and stubbing in tests.

✕ Not a fit for

Projects that do not require extensive unit testing or mocking capabilities.

Applications primarily written in languages other than JavaScript, as Sinon.JS is specifically designed for JavaScript.

Cost structure

Pricing

Free Tier

None

Starts at

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Model

Flat rate

Enterprise

None

Performance benchmarks

How Fast Is It?

Ecosystem

Relationships

Alternatives

Jest

Next step

Get Started with Sinon.JS

Step-by-step setup guide with code examples and common gotchas.

View Setup Guide →