Update main_test.js

lab2

lab2/main_test.js

@@ -1,6 +1,100 @@
 const test = require('node:test');
 const assert = require('assert');
+const fs = require('fs');
+const { promisify } = require('util');
 const { Application, MailSystem } = require('./main');
 
-// TODO: write your tests here
-// Remember to use Stub, Mock, and Spy when necessary
+const writeFile = promisify(fs.writeFile);
+
+//test.mock.method(fs, 'readFile', async (file, encoding) => {
+
+test("Test MailSystem's write", () => {
+    const mailSystem = new MailSystem();
+    const context = mailSystem.write('a');
+    assert.strictEqual(context, 'Congrats, a!');
+});
+
+test("Test MailSystem's send", () => {
+    const mailSystem = new MailSystem();
+    const originalMathRandom = Math.random;
+    Math.random = () => 0.51;
+    const result = mailSystem.send('SUNGOD', 'Test context');
+    assert.strictEqual(result, true);
+    Math.random = () => 0.49;
+    const result2 = mailSystem.send('SUNGOD', 'Test context');
+    assert.strictEqual(result2, false);
+    Math.random = originalMathRandom;
+});
+
+test("Test Application's getRandom&selectNextPerson", async () => {
+    const fakeData = 'John\nJane';
+    const fakeFile = 'name_list.txt';
+    await writeFile(fakeFile, fakeData, 'utf8');
+
+    const application = new Application();
+    const [people, selected] = await application.getNames();
+
+    assert.deepStrictEqual(people, ['John', 'Jane']);
+    assert.deepStrictEqual(selected, []);
+
+    const rd_person = application.getRandomPerson();
+    assert.ok(people.includes(rd_person));
+
+    application.getRandomPerson = () => 'John';
+    let person = application.selectNextPerson();
+    assert.deepStrictEqual(application.selected, ['John']);
+
+    // Select the next person
+    application.getRandomPerson = () => 'Jane';
+    person = application.selectNextPerson();
+    assert.deepStrictEqual(application.selected, ['John', 'Jane']);
+
+    // All people are selected
+    person = application.selectNextPerson();
+    assert.strictEqual(person, null);
+
+    let cnt = 0;
+    application.getRandomPerson = () => {
+        if (cnt++ % 2 === 0) {
+            return 'John';
+        } else {
+            return 'Jane';
+        }
+    }
+    application.selected = ['John'];
+    person = application.selectNextPerson();
+    assert.strictEqual(person, 'Jane');
+
+    fs.unlinkSync(fakeFile);
+});
+
+test("Test Application's notifySelected", async () => {
+    const fakeData = 'John\nJane\nDoe\nSmith';
+    const fakeFile = 'name_list.txt';
+    await writeFile(fakeFile, fakeData, 'utf8');
+
+    const application = new Application();
+    const [people, selected] = await application.getNames();
+
+    assert.deepStrictEqual(people, ['John', 'Jane', 'Doe', 'Smith']);
+    assert.deepStrictEqual(selected, []);
+
+    // Create a spy for the MailSystem's write and send methods
+    const mailSystemSpy = {
+        write: test.mock.fn(MailSystem.prototype.write),
+        send: test.mock.fn(MailSystem.prototype.send)
+    };
+    application.mailSystem = mailSystemSpy;
+    application.selected = ['John', 'Jane', 'Doe'];
+
+    application.notifySelected();
+
+    // Ensure that write and send methods are called for each selected person
+    assert.strictEqual(mailSystemSpy.write.mock.callCount(), 3);
+    assert.strictEqual(mailSystemSpy.send.mock.callCount(), 3);
+
+    assert.deepStrictEqual(mailSystemSpy.write.mock.calls.map(call => call.arguments[0]), ['John', 'Jane', 'Doe']);
+    assert.deepStrictEqual(mailSystemSpy.send.mock.calls.map(call => call.arguments[0]), ['John', 'Jane', 'Doe']);
+
+    fs.unlinkSync(fakeFile);
+});