l3lackcurtains / NodeJS-Mocha-Chai-Test

test/mdb.spec.js

import mongoose from 'mongoose'

import chai from 'chai'

import sinon from 'sinon'

import User from '../models/user'

import { allUsers } from '../app/user'

import factories from './factories'


const expect = chai.expect


describe('Mongoose Database test', () => {

	// Before starting this test, we will create a sandboxed database connection

	// Once connection is done, invoke done()


	before((done) => {

		mongoose.Promise = require('bluebird')

		mongoose.connect('mongodb://localhost/testApp')

		const db = mongoose.connection

		db.on('error', () => console.error.bind(console, 'connection error!!'))

			.once('open', () => {

				console.log('We are connected to database.')

				done()

			})

	})


	// Test mongoose model ( required: true )

	describe('Mongoose model test', () => {

		it('Should be invalid if name is empty', done => {

			var user = new User()

			user.validate(err => {

				expect(err.errors.name).to.exist

				done()

			})

		})

	

		// if canPost = true, isAdmin = false then, canPost is required

		it('Should have validation error for canPost if not isAdmin', (done) => {

			const user = new User({ canPost: true })


			user.validate(err => {

				expect(err.errors.canPost).to.exist

				done()

			})

		})


		// if canPost = true, isAdmin = true then, canPost is not required

		it('should be valid canPost when isAdmin', done => {

			const user = new User({ isAdmin: true, canPost: true})

			

			user.validate(err => {

				expect(err.errors.canPost).to.not.exist

				done()

			})

		})

	})



	// Testing model instance methods

	describe('Testing model instance methods', () => {

		/*

		*  You’d typically have two kinds of instance methods on your models:

		*  1) Instance methods which do not access the database

		*  2) Instance methods which access the database

		*/


		beforeEach(function() {

			sinon.stub(User, 'findOne')

		})

	

	

		afterEach(function() {

			User.findOne.restore()

		})


		// Testing the checkForCanPost method

		it('Should check for canpost with the same name', () => {

			

			/*

			 *  This is the function that would get called,

			 *  so we stub it out so it doesn’t do any database access.

			 *  Stubbing it also allows us to use Sinon to check whether it was called with the

			 *  correct parameters.

			*/

			User.findOne


			const expectedName = 'This name should be used in the check'

			const user = new User({ name: expectedName })


			user.checkForCanPost(() => {})

			

			/*

			 *  we use sinon.assert.calledWith to check the stubbed finder was called correctly.

			*/

			sinon.assert.calledWith(User.findOne, {

				name: expectedName,

				canPost: true

			})

		})

		

		//  another test for this to confirm the result from findOne is handled correctly

		it('should call back with true when canPost exists', done => {

			const canPostObject = { name: 'Madhav'}


			/*

			 *  The yields function on a stub makes it automatically call any callback function

			 *  with a certain set of parameters – in this case, we’re passing null to signify

			 *  no error, and the cannPostObject to act as a found Mongoose model.

			*/

			User.findOne.yields(null, canPostObject)

			const user = new User({ name: 'Some name' })


			/*

			 *  This time we use a callback in checkForCanPost to do the assertion, as we want to

			 *  ensure it was called with the correct value.

			*/

			user.checkForCanPost(function(hasCanPost) {

				expect(hasCanPost).to.be.true

				done()

			})

		})




	})


	describe('Mongoose database external functions test', () => {

		beforeEach(function() {

			sinon.stub(User, 'find')

		})

	

	

		afterEach(function() {

			User.find.restore()

		})

		// Should send all users

		it('Should send all users', () => {

			const a = factories.validUser

			const b = factories.validUser

			const expectedModels = [a, b]

			User.find.yields(null, expectedModels)

			const req = { params: { } }

			const res = {

				send: sinon.stub()

			}


			allUsers(req, res)

			sinon.assert.calledWith(res.send, expectedModels)

		})


		/*

		 * In this one we’re setting up some expeced data – in this case, the expected list of models

		 *  the find function should return. We also set up the stub to yield the result.

		*/

		it('Should query for cannot post if set as request parameter', () => {

			User.find.yields(null, [])

			const req = {

				params: {

					canPost: true

				}

			}


			const res = { send: sinon.stub() }


			allUsers(req, res)

			sinon.assert.calledWith(User.find, { canPost: true })

		})

	})



	// Now we test the database

	describe('Mongoose Database Test', () => {

		

		// save object with 'name' value of 'John'

		it('Should save new name to test database', (done) => {

			const testUser = User({

				name: 'John'

			})

			testUser.save(done)

		})


		// Dont save incorrect object to database

		it('Should not save wrong object data', (done) => {

			const wrongUser = User({

				notName: 'Somebody else'

			})


			wrongUser.save(err => {

				if (err) return done()

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

				throw new Error('Should generate error..')

			})

		})


		// Retrieve data from test database

		it('Should retrieve data from test database', (done) => {

			User.find({ name: 'John' }, (err, user) => {

				if (err) throw err

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

				if(user.length == 0) throw new Error('No data')

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

				done()

			})

		})


		// After all test is done drop database and close connection

		after(done => {

			mongoose.connection.db.dropDatabase(() => {

				mongoose.connection.close(done)

			})

		})

	})

})