diff --git a/lab3/main_test.js b/lab3/main_test.js
index e6d6414..4f4dbd7 100644
--- a/lab3/main_test.js
+++ b/lab3/main_test.js
@@ -1,5 +1,59 @@
 const {describe, it} = require('node:test');
 const assert = require('assert');
 const { Calculator } = require('./main');
+const { normalize } = require('path');
 
-// TODO: write your tests here
+describe('Calculator', () =>{
+    const calculator = new Calculator();
+
+    describe('exp(x)', () =>{
+        const normalCases = [
+            {x: 0, expected: 1},
+            {x: 1, expected: Math.E},
+            {x: -1, expected: 1/Math.E}
+        ];
+
+        for(const nc of normalCases)
+        {
+            assert.strictEqual(calculator.exp(nc.x), nc.expected);
+        }
+
+        const errorCases = [
+            {x: Infinity, error: 'unsupported operand type'},
+            {x: NaN, error: 'unsupported operand type'},
+            {x: 10000, error: 'overflow'},
+
+        ];
+
+        for(const ec of errorCases)
+        {
+            assert.throws(() => {calculator.exp(ec.x);}, { message: ec.error});
+        }
+    });
+
+    describe('log(x)', () =>{
+        const normalCases = [
+            {x: 1, expected: 0},
+            {x: Math.E, expected: 1},
+            {x: 1/Math.E, expected: -1}
+        ];
+
+        for(const nc of normalCases)
+        {
+            assert.strictEqual(calculator.log(nc.x), nc.expected);
+        }
+
+        const errorCases = [
+            {x: Infinity, error: 'unsupported operand type'},
+            {x: NaN, error: 'unsupported operand type'},
+            {x: 0, error: 'math domain error (1)'},
+            {x: -1, error: 'math domain error (2)'}
+
+        ];
+
+        for(const ec of errorCases)
+        {
+            assert.throws(() => {calculator.log(ec.x);}, { message: ec.error});
+        }
+    });
+});
diff --git a/lab4/main_test.js b/lab4/main_test.js
index e37d21a..5da7fd8 100644
--- a/lab4/main_test.js
+++ b/lab4/main_test.js
@@ -10,13 +10,25 @@ const puppeteer = require('puppeteer');
 
     // Hints:
     // Click search button
+    await page.waitForSelector('.DocSearch-Button-Placeholder'); //select by class(.)
+    await page.click('.DocSearch-Search-Icon');
+
     // Type into search box
-    // Wait for search result
+    await page.waitForSelector('#docsearch-input'); //select by id(#)
+    await page.type('#docsearch-input', 'andy popoo');
+
+    // Wait for search result 
     // Get the `Docs` result section
     // Click on first result in `Docs` section
+    await page.waitForSelector('#docsearch-hits1-item-4 a'); //find first <a> element in child
+    const resultHref = await page.$eval('#docsearch-hits1-item-4 a', el => el.href);
+    await page.goto(resultHref, { waitUntil: 'domcontentloaded' });
+    
     // Locate the title
-    // Print the title
-
+    await page.waitForSelector('.theme-doc-markdown h1'); 
+    const resultTitle = await page.$eval('.theme-doc-markdown h1', el => el.textContent);
+    // Print the title 
+    console.log(`${resultTitle}`);
     // Close the browser
     await browser.close();
 })();
\ No newline at end of file