added some simple tests

.eslintrc.json

@@ -0,0 +1,53 @@
+
+{
+  "env": {
+    "es6": true,
+    "jasmine": true,
+    "node": true,
+    "browser": true,
+    "jest": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 8
+  },
+  "rules": {
+    "arrow-body-style": 2,
+    "arrow-spacing": [1, {"before": true, "after": true}],
+    "brace-style": 2,
+    "camelcase": [2, {"properties": "never"}],
+    "eol-last": 1,
+    "eqeqeq": 2,
+    "global-require": 2,
+    "handle-callback-err": 2,
+    "indent": [1, "tab", {"SwitchCase": 1}],
+    "key-spacing": ["error", {"beforeColon": false, "afterColon": true}],
+    "linebreak-style": [2, "unix"],
+    "no-cond-assign": 2,
+    "no-dupe-args": 2,
+    "no-dupe-keys": 2,
+    "no-duplicate-case": 2,
+    "no-empty": 1,
+    "no-empty-function": 2,
+    "no-multiple-empty-lines": 1,
+    "no-extra-parens": 2,
+    "no-func-assign": 2,
+    "no-irregular-whitespace": 2,
+    "no-magic-numbers": [1, {"ignore": [-1, 0, 1]}],
+    "no-multi-spaces": 1,
+    "no-multi-str": 1,
+    "no-unexpected-multiline": 2,
+    "no-unreachable": 2,
+    "no-self-assign": 2,
+    "no-trailing-spaces": 1,
+    "no-undef": 2,
+    "no-unused-vars": 1,
+    "no-var": 2,
+    "prefer-arrow-callback": 1,
+    "prefer-const": 2,
+    "quotes": [1, "single"],
+    "semi": [1, "never"],
+    "space-before-function-paren": [2, "never"],
+    "strict": [2, "global"],
+    "yoda": 2
+  }
+}

exercises/01_tdd_nodejs/books/package.json

@@ -4,7 +4,7 @@
   "description": "Simple dynamic website that uses the Google Books API",
   "main": "index.js",
   "scripts": {
-    "tests": "jest",
+    "test": "jest",
     "watch": "node_modules/.bin/jest --coverage --watchAll",
     "coverage": "node_modules/.bin/jest --coverage",
     "jsdoc": "node_modules/.bin/jsdoc -d docs/jsdoc/ modules/"

exercises/01_tdd_nodejs/todo/__tests__/todo.test.js

@@ -0,0 +1,68 @@
+
+'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)
+		const items = todo.getAll()
+		expect(items.length).toBe(1)
+		done()
+	})
+
+})
+
+describe('clear', () => {
+
+	test('clear list with items', done => {
+		expect.assertions(1)
+		todo.add('bread', 1)
+		todo.add('butter', 2)
+		todo.clear()
+		const items = todo.getAll()
+		expect(items.length).toBe(0)
+		done()
+	})
+
+	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('add', () => {
+
+	afterEach( () => todo.clear())
+
+	test('adding a single item', () => {
+		expect.assertions(1)
+		todo.add('bread', 1)
+		const items = todo.getAll()
+		expect(items.length).toBe(1)
+	})
+
+})
+
+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)
+	})
+
+})

exercises/01_tdd_nodejs/todo/index.js

@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+
+'use strict'
+
+const express = require('express')
+
+const handlebars = require('express3-handlebars').create({defaultLayout: 'main'})
+const bodyParser = require('body-parser')
+const app = express()
+app.use(express.static('public'))
+app.use(bodyParser.urlencoded({ extended: true }))
+
+app.engine('handlebars', handlebars.engine)
+app.set('view engine', 'handlebars')
+
+const port = 8080
+
+const todo = require('./modules/todo')
+
+app.get('/', async(req, res) => {
+	try {
+		todo.add('bread', 1)
+		const data = todo.getAll()
+		res.render('home', {items: data})
+	} catch(err) {
+		console.log(err.message)
+	}	
+})
+
+app.listen(port, () => console.log(`app listening on port ${port}`))

exercises/01_tdd_nodejs/todo/modules/todo.js

@@ -0,0 +1,15 @@
+
+'use strict'
+
+let data = []
+
+module.exports.clear = () => {
+	if(data.length === 0) throw new Error('trying to clear empty list')
+	data = []
+}
+
+module.exports.add = (item, qty = 1) => {
+	data.push({item: item, qty: qty})
+}
+
+module.exports.getAll = () => data

exercises/01_tdd_nodejs/todo/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "todo",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest",
+    "watch": "node_modules/.bin/jest --coverage --watchAll",
+    "coverage": "node_modules/.bin/jest --coverage"
+  },
+  "jest": {
+    "testEnvironment": "node",
+    "verbose": true
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "eslint": "^5.3.0",
+    "jest": "^23.5.0"
+  },
+  "dependencies": {
+    "express": "^4.16.3",
+    "express3-handlebars": "^0.5.2"
+  }
+}

exercises/01_tdd_nodejs/todo/views/home.handlebars

@@ -0,0 +1,7 @@
+
+<h2>My List</h2>
+<table>
+	{{#each items}}
+		<tr><td>{{this.item}}</td><td>{{this.qty}}</td></tr>
+	{{/each}}
+</table>

exercises/01_tdd_nodejs/todo/views/layouts/main.handlebars

@@ -0,0 +1,10 @@
+
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>Onlne Bookshop</title>
+	</head>
+	<body>
+		{{{body}}}
+	</body>
+</html>