mocha.opts

--reporter spec
--require test/support/node
--recursive
--timeout 3000

node.js

var chai = require('chai')
var expect = chai.expect
var chaiAsPromised = require('chai-as-promised')
var sinon = require('sinon')

require('babel-polyfill')

chai.use(chaiAsPromised)

global.chaiAsPromised = chaiAsPromised
global.expect = chai.expect
global.sinon = sinon
global.Promise = Promise

sample.spec.js

var dynamo = require('../../util/dynamo')

describe('dynamo module', function() {

	describe('build update expression', function() {

		it('should produce set expressions for changes', function() {
			var original = { name: 'tim', age: 28 }
			var updated = { name: 'tim', age: 29 }
			var expression = dynamo.buildUpdateExpression(original, updated)
			
			expect(Object.values(expression.names)).to.include('age')
			expect(Object.values(expression.values)).to.include(29)
			expect(expression.expression).to.match(/^SET/)
		})

		it('should produce delete expressions for changes', function() {
			var original = { name: 'tim', age: 28 }
			var updated = { name: 'tim' }
			var expression = dynamo.buildUpdateExpression(original, updated)

			expect(Object.values(expression.names)).to.include('age')
			expect(expression.expression).to.match(/^REMOVE/)
		})
	})
})