List:

• API
• Cheatsheet
• fail a test expect.fail('Make test fail')

3 assertion styles:

• assert (node assertion API)
• BDD
  • expect
  • should

Mind the require:

• expect is a function
• should is an object (should extends Object.prototype with a should() function )

const chai = require('chai');

// THIS
const expect = chai.expect;
const should = chai.should();

// OR THAT
const should = require('chai').should();
const expect = require('chai').expect;

Curated list:

• things adds support for assertions on array elements
• exclude exclude properties in comparison
• as-promised asynchronous
• http
• sinon-chai extends assertion for sinon (test double)
• chai-fs to test filesystem
• chai-string to test string