Update main_test.js

Author: agtfsfhgsdf

lab2/main_test.js

@@ -1,6 +1,61 @@
 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
+// Remember to use Stub, Mock, and Spy when necessary
+const test = require('node:test');
+const assert = require('assert');
+const { Application, MailSystem } = require('./main');
+//write tests use Stub, Mock, and Spy when necessary
+const fs = require('fs');
+const util = require('util');
+const readFile = util.promisify(fs.readFile);
+test.mock.method(fs, 'readFile', (file, options, callback) => { 
+    callback(null, 'john\njohn1\njohn2');
+}
+);
+//test mailSystem : write()
+test('should be able to write mail', () => {
+    const mailSystem = new MailSystem();
+    const context = mailSystem.write('test');
+    assert.strictEqual(context, 'Congrats, test!');
+   	
+});
+// Test MailSystem : send()
+test('should be able to send mail', () => {
+    const mailSystem = new MailSystem();
+    const success = mailSystem.send('test', 'test');
+    test.mock.method(Math, 'random', () => 0.6);
+    assert.strictEqual(mailSystem.send('ok', 'success'),true);
+    test.mock.method(Math, 'random', () => 0.4);
+    assert.strictEqual(mailSystem.send('fa', 'fail'),false);
+});   
+// Test Application : getNames()
+test('should be able to get names', async () => {
+    const app = new Application();
+    const names = await app.getNames();
+    assert.ok(names);
+});
+// Test Application : getRandomPerson()
+test('should be able to get random person', () => {
+    const app = new Application();
+    const person = app.getRandomPerson();
+    test.mock.method(Math, 'random', () => 0);
+});
+// Test Application : selectNextPerson()
+test('should be able to select next person', () => {
+    const app = new Application();
+    const person = app.selectNextPerson();
+    let cn = 0;
+    test.mock.method(app, 'getRandomPerson', () => {
+        if (cn <= person.length) { 
+            return person[0][cn++]; 
+        }
+     });
+});
+// Test Application : notifySelected()
+test('should be able to notify selected', () => {
+    const app = new Application();
+    app.notifySelected();
+    assert.ok(app);
+});