diff --git a/lab3/main_test.js b/lab3/main_test.js
index e6d6414..a911ac3 100644
--- a/lab3/main_test.js
+++ b/lab3/main_test.js
@@ -1,5 +1,59 @@
+<<<<<<< HEAD
+// const {describe, it} = require('node:test');
+const assert = require('assert');
+const { Calculator } = require('./main');
+const test = require('node:test');
+// TODO: write your tests here
+
+const calc = new Calculator();
+test('exp', () => {
+    const cases = [
+        { input: 1, expected: Math.exp(1) },
+        { input: 0, expected: 1 },
+        { input: -2, expected: Math.exp(-2) }
+    ];
+
+    for (const tc of cases) {
+        assert.ok(Math.abs(calc.exp(tc.input) - tc.expected) < 1e-10);
+    }
+});
+
+
+test('log', () => {
+    const cases = [
+        { input: 1, expected: 0 },
+        { input: Math.E, expected: 1 },
+        { input: 10, expected: Math.log(10) }
+    ];
+
+    for (const tc of cases) {
+        assert.ok(Math.abs(calc.log(tc.input) - tc.expected) < 1e-10);
+    }
+});
+
+// error
+test('exp type error or overflow', () => {
+    const badInputs = [Infinity, -Infinity, NaN];
+    for (const val of badInputs) {
+        assert.throws(() => calc.exp(val), /unsupported operand type/);
+    }
+
+    assert.throws(() => calc.exp(10000), /overflow/);
+});
+
+test('log errors', () => {
+    const badInputs = [Infinity, -Infinity, NaN];
+    for (const val of badInputs) {
+        assert.throws(() => calc.log(val), /unsupported operand type/);
+    }
+
+    assert.throws(() => calc.log(0), /math domain error \(1\)/);
+    assert.throws(() => calc.log(-1), /math domain error \(2\)/);
+});
+=======
 const {describe, it} = require('node:test');
 const assert = require('assert');
 const { Calculator } = require('./main');
 
 // TODO: write your tests here
+>>>>>>> 0fddd2447c7e3144c1f3e22b6e6b7b6c5e1d49fb
diff --git a/lab4/README.md b/lab4/README.md
new file mode 100644
index 0000000..c9cb0b7
--- /dev/null
+++ b/lab4/README.md
@@ -0,0 +1,29 @@
+# Lab4
+
+## Introduction
+
+In this lab, you will write tests in `main_test.js`. You can learn how to use [Puppeteer](https://pptr.dev/) to tests a web UI.
+
+## Preparation (Important!!!)
+
+1. Sync fork your branch (e.g., `SQLab:312XXXXXX`)
+2. `git checkout -b lab4` (**NOT** your student ID !!!)
+
+## Requirement
+
+1. (100%) Goto https://pptr.dev/, type `chipi chipi chapa chapa` into the search box, click on **1st** result in the **Docs** section, and print the title.
+
+For the detailed steps and hints, please check the slide of this lab.
+
+You can run `validate.sh` in your local to test if you satisfy the requirements.
+
+Please note that you must not alter files other than `main_test.js`. You will get 0 points if
+
+1. you modify other files to achieve requirements.
+2. you can't pass all CI on your PR.
+
+## Submission
+
+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.
+
+Moreover, please submit the URL of your PR to E3. Your submission will only be accepted when you present at both places.
diff --git a/lab4/main_test.js b/lab4/main_test.js
new file mode 100644
index 0000000..e8e4a91
--- /dev/null
+++ b/lab4/main_test.js
@@ -0,0 +1,37 @@
+const puppeteer = require('puppeteer');
+
+function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+(async () => {
+    // Launch the browser and open a new blank page
+    const browser = await puppeteer.launch();
+    const page = await browser.newPage();
+
+    // Navigate the page to a URL
+    await page.goto('https://pptr.dev/');
+
+    // Hints:
+    // Click search button
+    await page.waitForSelector('button.DocSearch-Button', { visible: true });
+    await page.click('button.DocSearch-Button');
+
+    // Type into search box
+    await page.waitForSelector('#docsearch-input');
+    await page.type('#docsearch-input', 'andy popoo');
+    await sleep(300);
+    // Wait for search results  
+    await page.waitForSelector('#docsearch-hits1-item-4 > a > div', { visible: true });
+    
+    await page.click('#docsearch-hits1-item-4 > a > div');
+    // Find the first result in the Docs section and click it
+    await page.waitForSelector('h1');
+    const title = await page.$eval('h1', el => el.textContent.trim());
+    // Wait for navigation to finish and the title to appear
+    
+    
+    console.log(title)
+    // Close the browser
+    await browser.close();
+})();
\ No newline at end of file
diff --git a/lab4/package-lock.json b/lab4/package-lock.json
new file mode 100644
index 0000000..b6c4a5a
--- /dev/null
+++ b/lab4/package-lock.json
@@ -0,0 +1,1237 @@
+{
+  "name": "lab4",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "puppeteer": "^22.15.0"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.24.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.24.1.tgz",
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+      "dependencies": {
+        "@babel/highlight": "^7.24.1",
+        "picocolors": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.22.20",
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+      "engines": {
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+      "dependencies": {
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+        "chalk": "^2.4.2",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.0.0"
+      },
+      "engines": {
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+      }
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+      },
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+      }
+    },
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+        "node": ">=12"
+      }
+    },
+    "node_modules/yauzl": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha512-p4a9I6X6nu6IhoGmBqAcbJy1mlC4j27vEPZX9F4L4/vZT3Lyq1VkFHw/V/PUcB9Buo+DG3iHkT0x3Qya58zc3g==",
+      "license": "MIT",
+      "dependencies": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      }
+    },
+    "node_modules/zod": {
+      "version": "3.23.8",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.23.8.tgz",
+      "integrity": "sha512-XBx9AXhXktjUqnepgTiE5flcKIYWi/rme0Eaj+5Y0lftuGBq+jyRu/md4WnuxqgP1ubdpNCsYEYPxrzVHD8d6g==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    }
+  }
+}
diff --git a/lab4/package.json b/lab4/package.json
new file mode 100644
index 0000000..7a2b734
--- /dev/null
+++ b/lab4/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "puppeteer": "^22.15.0"
+  }
+}
diff --git a/lab4/validate.sh b/lab4/validate.sh
new file mode 100755
index 0000000..1130e5c
--- /dev/null
+++ b/lab4/validate.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Check for unwanted files
+for file in *; do
+  if [[ $file != "node_modules" && $file != "main_test.js" && $file != "package-lock.json" && $file != "package.json" && $file != "README.md" && $file != "validate.sh" ]]; then
+    echo "[!] Unwanted file detected: $file."
+    exit 1
+  fi
+done
+
+node=$(which node)
+test_path="${BASH_SOURCE[0]}"
+solution_path="$(realpath .)"
+tmp_dir=$(mktemp -d -t lab4-XXXXXXXXXX)
+answer="ElementHandle.dragAndDrop() method"
+
+cd $tmp_dir
+
+rm -rf *
+cp $solution_path/*.js .
+cp $solution_path/*.json .
+
+# Install dependencies
+npm ci
+
+result=$($"node" main_test.js) ; ret=$?
+if [ $ret -ne 0 ] ; then
+  echo "[!] testing fails"
+  exit 1
+else
+  title=$(echo "$result" | head -1)
+  if [[ $title != $answer ]]; then
+    echo "[!] Expected: $answer"
+    echo "[!] Actual:   $title"
+    exit 1
+  else
+    echo "[V] Pass"
+  fi
+fi
+
+rm -rf $tmp_dir
+
+exit 0
+
+# vim: set fenc=utf8 ff=unix et sw=2 ts=2 sts=2:
\ No newline at end of file