complete lab2

Author: sss28072637

lab2/main_test.js

@@ -2,5 +2,91 @@ const test = require('node:test');
 const assert = require('assert');
 const { Application, MailSystem } = require('./main');
 
-// TODO: write your tests here
-// Remember to use Stub, Mock, and Spy when necessary
+// // TODO: write your tests here
+// // Remember to use Stub, Mock, and Spy when necessary
+const fs = require('fs');
+const path = require('path');
+
+test('MailSystem should return the correct message context.', () => {
+    const mailSystem = new MailSystem();
+    const recipient = 'Justin';
+
+    const message = mailSystem.write(recipient);
+    assert.strictEqual(message, 'Congrats, Justin!');
+});
+
+test('MailSystem should send mail corrctly', (t) => {
+    const mailSystem = new MailSystem();
+
+    // SUCCESS
+	t.mock.method(Math,'random', () => 1);
+    let isMailSent = mailSystem.send('Alice', "Hello Message");
+    assert.strictEqual(isMailSent, true);
+
+    // FAIL
+    t.mock.method(Math, 'random', () => 0.5);
+    isMailSent = mailSystem.send('Alice', "Hello Message");
+    assert.strictEqual(isMailSent, false);
+});
+ 
+test('Application should read names from file correctly', async()=>{
+    const nameList = 'Alice\nBob\nCharlie';
+    const filePath = path.join('name_list.txt');
+    fs.writeFileSync(filePath, nameList);
+
+    const app = new Application();
+    const [names, selected] = await app.getNames(filePath);
+
+    assert.deepStrictEqual(names, ['Alice', 'Bob', 'Charlie']);
+    assert.deepStrictEqual(selected, []);
+});
+    
+test('Application should return null when all people are selected', async (t) => {
+    const app = new Application();
+    app.people = ['Alice', 'Bob', 'Charlie'];
+    app.selected = ['Alice', 'Bob', 'Charlie'];
+
+    const selectedPerson = app.selectNextPerson();
+    assert.strictEqual(selectedPerson, null);
+});
+
+test('Application should return a person randomly selected from the list', () => {
+    Math.random = () => 0.2;
+    
+    const app = new Application();
+    app.people = ['Alice', 'Bob', 'Charlie'];
+
+    const selectedPerson = app.getRandomPerson();
+    assert(app.people.includes(selectedPerson));
+});
+
+test('Application should ensure no person is selected more than once', () => {
+    const app = new Application();
+    app.people = ['Alice', 'Bob', 'Charlie'];
+
+    let randomCallCount = 0;
+    const people = ['Alice', 'Bob', 'Charlie'];
+    app.getRandomPerson = () => people[randomCallCount++ % people.length];
+
+    app.selected = ['Alice', 'Bob'];
+    
+    const nextSelectedPerson = app.selectNextPerson();
+    assert.strictEqual(nextSelectedPerson, 'Charlie');
+    assert.strictEqual(randomCallCount, 3);
+});
+
+test('Application should call write and send for each selected person', () => {
+    const writeMock = test.mock.fn(() => 'Message context');
+    const sendMock = test.mock.fn(() => true);
+
+    const app = new Application();
+    app.mailSystem.write = writeMock;
+    app.mailSystem.send = sendMock;
+
+    app.selected = ['Alice', 'Bob', 'Charlie'];
+
+    app.notifySelected();
+
+    assert.strictEqual(writeMock.mock.callCount(), 3);
+    assert.strictEqual(sendMock.mock.callCount(), 3);
+});