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sinon-chai

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sinon-chai

Extends Chai with assertions for the Sinon.JS mocking framework.

  • 4.0.0
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What is sinon-chai?

The sinon-chai npm package is an extension for the Chai assertion library that provides a set of custom assertions for Sinon.js spies, stubs, and mocks. It allows for more readable and expressive tests by integrating Sinon.js functionalities directly into Chai's BDD/TDD assertion styles.

What are sinon-chai's main functionalities?

Assert a spy was called

This feature allows you to assert that a Sinon.js spy was called. The code sample demonstrates how to create a spy on a method and then assert that the method was called using Chai's expect syntax.

const sinon = require('sinon');
const chai = require('chai');
const sinonChai = require('sinon-chai');
chai.use(sinonChai);
const expect = chai.expect;

const myObj = {
  myMethod: function() {}
};

const spy = sinon.spy(myObj, 'myMethod');
myObj.myMethod();

expect(spy).to.have.been.called;

Assert a spy was called with specific arguments

This feature allows you to assert that a Sinon.js spy was called with specific arguments. The code sample demonstrates how to create a spy on a method and then assert that the method was called with a specific argument using Chai's expect syntax.

const sinon = require('sinon');
const chai = require('chai');
const sinonChai = require('sinon-chai');
chai.use(sinonChai);
const expect = chai.expect;

const myObj = {
  myMethod: function(arg) {}
};

const spy = sinon.spy(myObj, 'myMethod');
myObj.myMethod('test');

expect(spy).to.have.been.calledWith('test');

Assert a stub was called a specific number of times

This feature allows you to assert that a Sinon.js stub was called a specific number of times. The code sample demonstrates how to create a stub on a method and then assert that the method was called twice using Chai's expect syntax.

const sinon = require('sinon');
const chai = require('chai');
const sinonChai = require('sinon-chai');
chai.use(sinonChai);
const expect = chai.expect;

const myObj = {
  myMethod: function() {}
};

const stub = sinon.stub(myObj, 'myMethod');
myObj.myMethod();
myObj.myMethod();

expect(stub).to.have.been.calledTwice;

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Package last updated on 25 Jul 2024

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