added base code for todo

.vscode/launch.json

@@ -1,14 +1,36 @@
+
 {
 	"version": "0.2.0",
 	"configurations": [
 		{
 			"type": "node",
 			"request": "launch",
-			"name": "Jest Tests",
-			"program": "${workspaceFolder}/exercises/12_spa/books/node_modules/.bin/jest",
+			"name": "Jest All",
+			"program": "${workspaceFolder}/exercises/07_unit_testing/todo/node_modules/jest/bin/jest",
+			"args": ["--runInBand"],
+			"console": "integratedTerminal",
+			"internalConsoleOptions": "neverOpen",
+			"disableOptimisticBPs": true,
+			"windows": {
+				"program": "${workspaceFolder}/exercises/07_unit_testing/todo/node_modules/jest/bin/jest",
+			}
+		},
+		{
+			"type": "node",
+			"request": "launch",
+			"name": "Jest Current File",
+			"program": "${workspaceFolder}/exercises/07_unit_testing/todo/node_modules/jest/bin/jest",
 			"args": [
-				"-i"
-			]
+				"${fileBasenameNoExtension}",
+				"--config",
+				"jest.config.js"
+			],
+			"console": "integratedTerminal",
+			"internalConsoleOptions": "neverOpen",
+			"disableOptimisticBPs": true,
+			"windows": {
+				"program": "${workspaceFolder}/exercises/07_unit_testing/todo/node_modules/jest/bin/jest",
+			}
 		}
 	]
-}
+}

07 Unit Testing.md

@@ -4,3 +4,11 @@
 In this worksheet you will learn the basics of using automated tests to improve the quality of your code.
 
 Before you start you need to pull any _upstream changes_. Detailed instructions can be found in the **Setup** lab.
+
+We will be using both the Jest commandline tools and the integrated unit testing tools in Visual Studio Code, you should be familiar with both approaches.
+
+## Visual Studio Code Extensions
+
+One of the powerful features of VS Code is its support for **Extensions** which allow you to add additional capabilities to the editor.
+
+You should start by checking that the following VS Code Extensions are installed and install them if missing.

exercises/07_unit_testing/todo/.vscode/launch.json

@@ -0,0 +1,36 @@
+
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Jest All",
+      "program": "${workspaceFolder}/node_modules/.bin/jest",
+      "args": ["--runInBand"],
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen",
+      "disableOptimisticBPs": true,
+      "windows": {
+        "program": "${workspaceFolder}/node_modules/jest/bin/jest",
+      }
+    },
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Jest Current File",
+      "program": "${workspaceFolder}/node_modules/.bin/jest",
+      "args": [
+        "${fileBasenameNoExtension}",
+        "--config",
+        "jest.config.js"
+      ],
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen",
+      "disableOptimisticBPs": true,
+      "windows": {
+        "program": "${workspaceFolder}/node_modules/jest/bin/jest",
+      }
+    }
+  ]
+}

exercises/07_unit_testing/todo/jest-test.config.js

@@ -0,0 +1,26 @@
+
+'use strict';
+
+module.exports = {
+	displayName: 'test',
+	verbose: true,
+	collectCoverage: true,
+	testPathIgnorePatterns: [
+		'/node_modules/',
+		'/__tests__/fixtures/',
+	],
+}
+
+// "jest": {
+// 	"testEnvironment": "node",
+// 	"verbose": true,
+// 	"collectCoverage": true,
+// 	"coverageThreshold": {
+// 		"global": {
+// 			"branches": 0,
+// 			"functions": 0,
+// 			"lines": 0,
+// 			"statements": 0
+// 		}
+// 	}
+// }

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

@@ -8,6 +8,7 @@ module.exports.clear = () => {
 }
 
 module.exports.add = (item, qty) => {
+	if(typeof qty !== 'number') throw new Error('qty must be a number')
 	data.push({item: item, qty: qty})
 }
 
@@ -21,3 +22,7 @@ module.exports.delete = key => {
 	console.log(`delete key ${key}`)
 	return
 }
+
+module.exports.countItems = () => data.length
+
+module.exports.count = data.length

exercises/07_unit_testing/todo/package.json

@@ -4,7 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "linter": "node_modules/.bin/eslint .",
+    "test": "node_modules/.bin/jest --coverage --runInBand"
   },
   "author": "",
   "license": "ISC",
@@ -17,5 +18,13 @@
     "koa-router": "^7.4.0",
     "koa-static": "^5.0.0",
     "koa-views": "^6.2.1"
+  },
+  "devDependencies": {
+    "jest": "^24.9.0"
+  },
+  "jest": {
+    "projects": [
+      "<rootDir>/jest-test.config.js"
+    ]
   }
 }

exercises/07_unit_testing/todo/readme.md

@@ -0,0 +1,6 @@
+
+Install
+
+1. coverage-gutters
+2. jest
+3. test-explorer

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

@@ -0,0 +1,44 @@
+
+'use strict'
+
+const todo = require('../modules/todo.js')
+
+beforeAll( async() => {
+	// stuff to do before any of the tests run
+})
+
+afterAll( async() => {
+	// runs after all the tests have completed
+})
+
+describe('add()', () => {
+	// block of tests
+	beforeEach( async() => {
+		todo.clear()
+	})
+	afterEach( async() => {
+		// runs after each test completes
+	})
+	test('add a single item', async done => {
+		expect.assertions(1)
+		try {
+			todo.add('bread', 3)
+			expect(todo.countItems()).toBe(1)
+		} catch(err) {
+			done.fail(err)
+		} finally {
+			done()
+		}
+	})
+	test('qty must be a number', async done => {
+		expect.assertions(1)
+		try {
+			todo.add('bread', 'three')
+			done.fail('test failed')
+		} catch(err) {
+			expect(err.message).toBe('qty must be a number')
+		} finally {
+			done()
+		}
+	})
+})