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feat: lab3
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‎lab2/main_test.js‎

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import fs from 'fs';
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import path from 'path';
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import os from 'os';
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import test from 'node:test';
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import assert from 'assert';
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import { Application, MailSystem } from './main.js';
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const test = require('node:test');
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const assert = require('assert');
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const { Application, MailSystem } = require('./main');
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// 輔助函式：在暫存目錄中建立 name_list.txt，並切換工作目錄
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async function withTempNameList(fn) {
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const originalCwd = process.cwd();
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const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'lab2-'));
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fs.writeFileSync(path.join(tmpDir, 'name_list.txt'), 'Alice\nBob\nCharlie');
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process.chdir(tmpDir);
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try {
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await fn();
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} finally {
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process.chdir(originalCwd);
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fs.rmSync(tmpDir, { recursive: true, force: true });
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}
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}
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// 建立 Stub 輔助函式
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const createStub = (obj, method, implementation) => {
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const original = obj[method];
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obj[method] = implementation;
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return { restore: () => { obj[method] = original; } };
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};
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// 測試 MailSystem.write()（不需要檔案）
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test('MailSystem.write should generate correct mail content', () => {
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const mailSystem = new MailSystem();
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const result = mailSystem.write('Alice');
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assert.strictEqual(result, 'Congrats, Alice!');
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});
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// 測試 MailSystem.send()：透過 stub 控制隨機行為
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test('MailSystem.send should return success or failure', () => {
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const mailSystem = new MailSystem();
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const randomStub = createStub(Math, 'random', () => 0.9);
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assert.strictEqual(mailSystem.send('Alice', 'Congrats, Alice!'), true);
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randomStub.restore();
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const randomStub2 = createStub(Math, 'random', () => 0.4);
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assert.strictEqual(mailSystem.send('Alice', 'Congrats, Alice!'), false);
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randomStub2.restore();
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});
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// 以下測試皆需要 name_list.txt，所以採用 withTempNameList 包裹
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test('Application.getNames should read and parse names from file', async () => {
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await withTempNameList(async () => {
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const app = new Application();
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// 等待 constructor 的非同步初始化完成
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await new Promise(resolve => setTimeout(resolve, 10));
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const [people, selected] = await app.getNames();
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assert.deepStrictEqual(people, ['Alice', 'Bob', 'Charlie']);
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assert.deepStrictEqual(selected, []);
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});
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});
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test('Application constructor should initialize people and selected', async () => {
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await withTempNameList(async () => {
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const app = new Application();
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await new Promise(resolve => setTimeout(resolve, 10));
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assert.deepStrictEqual(app.people, ['Alice', 'Bob', 'Charlie']);
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assert.deepStrictEqual(app.selected, []);
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});
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});
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test('Application.getRandomPerson should return a person from people list', async () => {
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await withTempNameList(async () => {
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const app = new Application();
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await new Promise(resolve => setTimeout(resolve, 10));
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// stub Math.random 固定回傳 0.5 (floor(0.5 * 3) = 1) → 'Bob'
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const randomStub = createStub(Math, 'random', () => 0.5);
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assert.strictEqual(app.getRandomPerson(), 'Bob');
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randomStub.restore();
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});
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});
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test('Application.selectNextPerson should select a unique person in order', async () => {
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await withTempNameList(async () => {
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const app = new Application();
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await new Promise(resolve => setTimeout(resolve, 10));
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// stub getRandomPerson 依序回傳：'Alice', 'Bob', 'Charlie'
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let sequence = ['Alice', 'Bob', 'Charlie'];
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let index = 0;
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const stub = createStub(app, 'getRandomPerson', () => sequence[index++]);
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const selected1 = app.selectNextPerson();
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assert.strictEqual(selected1, 'Alice');
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assert.strictEqual(app.selected.length, 1);
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const selected2 = app.selectNextPerson();
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assert.strictEqual(selected2, 'Bob');
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assert.strictEqual(app.selected.length, 2);
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const selected3 = app.selectNextPerson();
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assert.strictEqual(selected3, 'Charlie');
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assert.strictEqual(app.selected.length, 3);
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const selected4 = app.selectNextPerson();
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assert.strictEqual(selected4, null);
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stub.restore();
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});
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});
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test('Application.selectNextPerson should retry if duplicate selected', async () => {
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await withTempNameList(async () => {
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const app = new Application();
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await new Promise(resolve => setTimeout(resolve, 10));
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// stub 模擬第一次回傳 'Alice'（已被選取），接著回傳 'Bob'
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let callCount = 0;
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const stub = createStub(app, 'getRandomPerson', () => {
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if (callCount === 0) {
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callCount++;
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return 'Alice';
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}
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return 'Bob';
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});
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// 預先將 'Alice' 加入已選名單
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app.selected = ['Alice'];
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const result = app.selectNextPerson();
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assert.strictEqual(result, 'Bob');
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stub.restore();
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});
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});
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test('Application.notifySelected should send mail to selected people', async () => {
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await withTempNameList(async () => {
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const app = new Application();
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await new Promise(resolve => setTimeout(resolve, 10));
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app.selected = ['Alice', 'Bob'];
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let writeCalls = [];
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let sendCalls = [];
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const writeStub = createStub(app.mailSystem, 'write', (name) => {
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writeCalls.push(name);
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return `Congrats, ${name}!`;
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});
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const sendStub = createStub(app.mailSystem, 'send', (name, content) => {
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sendCalls.push({ name, content });
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return true;
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});
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app.notifySelected();
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assert.deepStrictEqual(writeCalls, ['Alice', 'Bob']);
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assert.deepStrictEqual(sendCalls, [
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{ name: 'Alice', content: 'Congrats, Alice!' },
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{ name: 'Bob', content: 'Congrats, Bob!' }
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]);
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writeStub.restore();
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sendStub.restore();
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});
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});
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// TODO: write your tests here
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// Remember to use Stub, Mock, and Spy when necessary

‎lab3/README.md‎

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# Lab3
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## Introduction
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In this lab, you will write unit tests for functions implemented in `main.js`. You can learn how to use classes and functions in it by uncommenting the code in it. (But remember don't commit them on GitHub)
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## Preparation (Important!!!)
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1. Sync fork on GitHub
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2. `git checkout -b lab3` (**NOT** your student ID !!!)
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## Requirement
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1. (40%) Write test cases in `main_test.js` and achieve 100% code coverage.
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2. (30%) For each function, parameterize their testcases to test the error-results.
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3. (30%) For each function, use at least 3 parameterized testcases to test the non-error-results.
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You can run `validate.sh` in your local to test if you satisfy the requirements.
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Please note that you must not alter files other than `main_test.js`. You will get 0 points if
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1. you modify other files to achieve requirements.
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2. you can't pass all CI on your PR.
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## Submission
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You need to open a pull request to your branch (e.g. 312XXXXXX, your student number) and contain the code that satisfies the abovementioned requirements.
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Moreover, please submit the URL of your PR to E3. Your submission will only be accepted when you present at both places.

‎lab3/main.js‎

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class Calculator {
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exp(x) {
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if (!Number.isFinite(x)) {
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throw Error('unsupported operand type');
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}
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const result = Math.exp(x);
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if (result === Infinity) {
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throw Error('overflow');
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}
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return result;
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}
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log(x) {
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if (!Number.isFinite(x)) {
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throw Error('unsupported operand type');
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}
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const result = Math.log(x);
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if (result === -Infinity) {
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throw Error('math domain error (1)');
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}
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if (Number.isNaN(result)) {
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throw Error('math domain error (2)');
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}
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return result;
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}
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}
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// const calculator = new Calculator();
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// console.log(calculator.exp(87));
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// console.log(calculator.log(48763));
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module.exports = {
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Calculator
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};

‎lab3/main_test.js‎

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const {describe, it} = require('node:test');
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const assert = require('assert');
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const { Calculator } = require('./main');
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// TODO: write your tests here

‎lab3/validate.sh‎

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#!/bin/bash
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# Check for unwanted files
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for file in *; do
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if [[ $file != "main.js" && $file != "main_test.js" && $file != "README.md" && $file != "validate.sh" ]]; then
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echo "[!] Unwanted file detected: $file."
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exit 1
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fi
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done
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node=$(which node)
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test_path="${BASH_SOURCE[0]}"
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solution_path="$(realpath .)"
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tmp_dir=$(mktemp -d -t lab3-XXXXXXXXXX)
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cd $tmp_dir
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rm -rf *
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cp $solution_path/*.js .
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result=$($"node" --test --experimental-test-coverage) ; ret=$?
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if [ $ret -ne 0 ] ; then
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echo "[!] testing fails"
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exit 1
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else
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coverage=$(echo "$result" | grep 'all files' | awk -F '|' '{print $2}' | sed 's/ //g')
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if (( $(echo "$coverage < 100" | bc -l) )); then
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echo "[!] Coverage is only $coverage%"
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exit 1
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else
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echo "[V] Coverage is 100%"
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fi
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fi
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rm -rf $tmp_dir
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exit 0
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# vim: set fenc=utf8 ff=unix et sw=2 ts=2 sts=2:

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