added comments

.eslintrc.json

@@ -27,7 +27,7 @@
     "max-depth": ["error", 3],
     "max-len": ["warn", { "code": 120, "tabWidth": 4 }],
     "max-lines": ["error", 100],
-    "max-lines-per-function": ["error", 15],
+    "max-lines-per-function": ["error", 20],
     "max-nested-callbacks": ["error", 4],
     "max-params": ["error", 5],
     "max-statements": ["error", 20],

exercises/07_unit_testing/database/modules/todo.js

@@ -18,7 +18,7 @@ module.exports = class ToDo {
 		qty = Number(qty)
 		if(isNaN(qty)) throw new Error('the quantity must be a number')
 		let sql = 'SELECT * FROM items;'
-		const dataAll = await this.db.all(sql)
+		// const dataAll = await this.db.all(sql)
 		sql = `SELECT * FROM items WHERE ITEM = "${item}"`
 		const data = await this.db.all(sql)
 		if(data.length === 0) {

exercises/07_unit_testing/database/unit tests/todo.spec.js

@@ -22,9 +22,12 @@ describe('add()', () => {
 	test('add a single item', async done => {
 		expect.assertions(1)
 		try {
+			// ARRANGE
 			const todo = await new ToDo() // DB runs in-memory if no name supplied
+			// ACT
 			await todo.add('bread', 3)
 			const count = await todo.countItems()
+			// ASSERT
 			expect(count).toBe(1)
 		} catch(err) {
 			done.fail(err)
@@ -36,10 +39,13 @@ describe('add()', () => {
 	test('qty must be a number', async done => {
 		expect.assertions(1)
 		try {
+			// ARRANGE
 			const todo = await new ToDo()
+			// ACT
 			await todo.add('bread', 'three')
 			done.fail('test failed')
 		} catch(err) {
+			// ASSERT
 			expect(err.message).toBe('the quantity must be a number')
 		} finally {
 			done()