diff --git a/lab1/main_test.js b/lab1/main_test.js
index 74a716b..a24c60f 100644
--- a/lab1/main_test.js
+++ b/lab1/main_test.js
@@ -2,22 +2,52 @@ const test = require('node:test');
 const assert = require('assert');
 const { MyClass, Student } = require('./main');
 
+const myclass = new MyClass;
+
 test("Test MyClass's addStudent", () => {
     // TODO
-    throw new Error("Test not implemented");
+    assert.equal(-1, myclass.addStudent('Oops'));
+    const student = new Student;
+    const name = 'Kiwi'
+    student.setName(name);
+    assert.equal(0, myclass.addStudent(student));
+    return;
+    // throw new Error("Test not implemented");
 });
 
 test("Test MyClass's getStudentById", () => {
     // TODO
-    throw new Error("Test not implemented");
+    assert.equal(null, myclass.getStudentById(-3));
+    assert.equal(null, myclass.getStudentById(10));
+    const student = new Student;
+    const name = 'Kiwi'
+    student.setName(name);
+    const id = myclass.addStudent(student);
+    assert.equal(student, myclass.getStudentById(id));
+    return;
+    // throw new Error("Test not implemented");
 });
 
 test("Test Student's setName", () => {
     // TODO
-    throw new Error("Test not implemented");
+    const student = new Student;
+    student.setName(123);
+    assert.equal(undefined, student.name);
+
+    const name = 'Kiwi'
+    student.setName(name);
+    assert.equal(name, student.name);
+    return;
+    // throw new Error("Test not implemented");
 });
 
 test("Test Student's getName", () => {
     // TODO
-    throw new Error("Test not implemented");
+    const student = new Student;
+    assert.equal('', student.getName());
+    const name = 'Kiwi'
+    student.setName(name);
+    assert.equal(name, student.getName());
+    return;
+    // throw new Error("Test not implemented");
 });
\ No newline at end of file
diff --git a/lab4/main_test.js b/lab4/main_test.js
index e37d21a..a5d694f 100644
--- a/lab4/main_test.js
+++ b/lab4/main_test.js
@@ -2,7 +2,7 @@ const puppeteer = require('puppeteer');
 
 (async () => {
     // Launch the browser and open a new blank page
-    const browser = await puppeteer.launch();
+    const browser = await puppeteer.launch({executablePath: '/usr/bin/chromium-browser'});
     const page = await browser.newPage();
 
     // Navigate the page to a URL
@@ -17,6 +17,33 @@ const puppeteer = require('puppeteer');
     // Locate the title
     // Print the title
 
+    // (1) click search button
+    const searchSelector = '#__docusaurus > nav > div.navbar__inner > div.navbar__items.navbar__items--right > div.navbarSearchContainer_IP3a > button > span.DocSearch-Button-Container > span';
+    await page.click(searchSelector);
+
+    // (2) wait search box
+    const typeSelector = '#docsearch-input';
+    await page.waitForSelector(typeSelector);
+
+    // (3) type into search box
+    await page.type(typeSelector, 'andy popoo');
+
+    // (4) wait for search result
+    await new Promise(resolve => setTimeout(resolve, 500));
+    const resultSelector = '#docsearch-hits1-item-4 > a';
+    await page.waitForSelector(resultSelector);
+
+    // (5) click the result
+    await page.click(resultSelector);
+
+    // (6) get the title
+    const titleSelector = '#__docusaurus_skipToContent_fallback > div > div > main > div > div > div > div > article > div.theme-doc-markdown.markdown > header > h1';
+    const textSelector = await page.waitForSelector(titleSelector);
+    const fullTitle = await textSelector?.evaluate(el => el.innerText);
+
+    // (7) print the title
+    console.log(fullTitle);
+
     // Close the browser
     await browser.close();
 })();
\ No newline at end of file