todo.test.js

'use strict'

/* eslint-disable no-magic-numbers */

const todo = require('../modules/todo')

describe('add', () => {

	//beforeEach( () => todo.add('bread', 1))
	afterEach( () => todo.clear())

	test('check there is a single item', done => {
		expect.assertions(1)
		todo.add('bread', 1)
		const items = todo.getAll()
		expect(items.length).toBe(1)
		done()
	})

	test('adding a single item', () => {
		expect.assertions(1)
		todo.add('bread', 1)
		const items = todo.getAll()
		expect(items.length).toBe(1)
	})
	test('adding a blank string should throw an error', () => {
		expect.assertions(1)
		try {
		  todo.add('bread', 1)
		  todo.add('', '')
		} catch(err) {
		  expect(err.message).toBe('item is blank string')
		}
	  })
	test('Adding an invalid value in the quantity field should default to a value of 1', () => {
		expect.assertions(2)
		todo.add('bread')
		todo.add('plums','invalid')
		const items = todo.getAll()
		const bread = items.find(elem => elem.item == 'bread')
		const plums = items.find(elem => elem.item == 'plums')
		expect(bread.qty).toBe(1)
		expect(plums.qty).toBe(1)
	})
	test('Adding same value twice should increase the quantity instead of inserting a new element', ()=> {
		expect.assertions(1)
		todo.add('bread',1)
		todo.add('bread',1)
		const items = todo.getAll()
		const bread = items.find(elem => elem.item == 'bread')
		expect(bread.qty).toBe(2)
	})
	test('item names should be case insensitive',() => {
		expect.assertions(1)
		todo.add('bread',1)
		todo.add('BRead',1)
		const items = todo.getAll()
		const bread = items.find(elem => elem.item == 'bread')
		expect(bread.qty).toBe(2)
	})

})

describe('clear', () => {

	test('clear list with items', () => {
		expect.assertions(2)
		try {
			todo.add('bread', 1)
			todo.add('butter', 2)
			const data = todo.getAll()
			expect(data.length).toBe(2)
			todo.clear()
			todo.getAll()
		} catch(err) {
			expect(err.message).toBe('empty list')
		}
	})

	test('clearing empty list should throw error', () => {
		expect.assertions(1)
		try {
			todo.clear()
		} catch(err) {
			expect(err.message).toBe('trying to clear empty list')
		}
	})

})

describe('getAll', () => {

	test('retrieving a single item', () => {
		expect.assertions(2)
		todo.add('bread', 1)
		const items = todo.getAll()
		expect(Array.isArray(items)).toBeTruthy()
		expect(items.length).toBe(1)
	})

	test('retrieving empty list should throw an error', () => {
		expect.assertions(1)
		try {
			todo.clear()
			todo.getAll()
		} catch(err) {
			expect(err.message).toBe('empty list')
		}
	})

})