diff --git a/lab0/lab0.js b/lab0/lab0.js
index e69de29..940a3ff 100644
--- a/lab0/lab0.js
+++ b/lab0/lab0.js
@@ -0,0 +1 @@
+console.log("Hello world!");
diff --git a/lab1/README.md b/lab1/README.md
new file mode 100644
index 0000000..df0ab9f
--- /dev/null
+++ b/lab1/README.md
@@ -0,0 +1,22 @@
+# Lab1
+
+## Introduction
+
+In this lab, you will write unit tests for functions implemented in `main.js`. You can learn how to use classes and functions in it by uncommenting the code in it. (But remember don't commit them on GitHub)
+
+## Requirement
+
+1. Write test cases in `main_test.js` and achieve 100% code coverage. (100%)
+
+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. 311XXXXXX, 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/lab1/main.js b/lab1/main.js
new file mode 100644
index 0000000..c9aed9f
--- /dev/null
+++ b/lab1/main.js
@@ -0,0 +1,55 @@
+// NOTICE: DO NOT MODIFY THE CODE IN THIS FILE
+// But you can uncomment code below and run this file to understand how to use the classes
+
+class MyClass {
+    constructor() {
+        this.students = [];
+    }
+
+    addStudent(student) {
+        if (!(student instanceof Student)) {
+            return -1;
+        }
+        this.students.push(student);
+        return this.students.length - 1;
+    }
+
+    getStudentById(id) {
+        if (id < 0 || id >= this.students.length) {
+            return null;
+        }
+        return this.students[id];
+    }
+}
+
+class Student {
+    constructor() {
+        this.name = undefined;
+    }
+
+    setName(userName) {
+        if (typeof userName !== 'string') {
+            return;
+        }
+        this.name = userName;
+    }
+
+    getName() {
+        if (this.name === undefined) {
+            return '';
+        }
+        return this.name;
+    }
+}
+
+// const myClass = new MyClass();
+// const names = ['John', 'Jane', 'Doe', 'Smith'];
+// names.forEach(name => {
+//     const student = new Student();
+//     student.setName(name);
+//     const newStudentId = myClass.addStudent(student);
+//     const newStudentName = myClass.getStudentById(newStudentId).getName();
+//     console.log('[+] Added student with id: %d, name: %s', newStudentId, newStudentName);
+// });
+
+module.exports = { MyClass, Student };
\ No newline at end of file
diff --git a/lab1/main_test.js b/lab1/main_test.js
new file mode 100644
index 0000000..7ac4d73
--- /dev/null
+++ b/lab1/main_test.js
@@ -0,0 +1,44 @@
+const test = require('node:test')
+const assert = require('assert');
+const { MyClass, Student } = require('./main.js'); // 將 your-file-name 替換為你的檔案名稱
+
+test.beforeEach((context) => {
+  context.myClass = new MyClass();
+  context.student = new Student();
+});
+
+test('MyClass: should add a student and return the correct index', (context) => {
+  const index = context.myClass.addStudent(context.student);
+  assert.strictEqual(index, 0);
+});
+
+test('MyClass: should return -1 when adding a non-student object', (context) => {
+  const nonStudent = {};
+  const result = context.myClass.addStudent(nonStudent);
+  assert.strictEqual(result, -1);
+});
+
+test('MyClass: should get a student by id', (context) => {
+  context.myClass.addStudent(context.student);
+  const retrievedStudent = context.myClass.getStudentById(0);
+  assert.strictEqual(retrievedStudent, context.student);
+});
+
+test('MyClass: should return null when getting a student with an invalid id', (context) => {
+  assert.strictEqual(context.myClass.getStudentById(-1), null);
+  assert.strictEqual(context.myClass.getStudentById(1), null);
+});
+
+test('Student: should set the student name', (context) => {
+  context.student.setName('John Doe');
+  assert.strictEqual(context.student.getName(), 'John Doe');
+});
+
+test('Student: should not set the student name if it is not a string', (context) => {
+  context.student.setName(123);
+  assert.strictEqual(context.student.getName(), '');
+});
+
+test('Student: should return an empty string if the name is undefined', (context) => {
+  assert.strictEqual(context.student.getName(), '');
+});
diff --git a/lab1/validate.sh b/lab1/validate.sh
new file mode 100755
index 0000000..8f2fcd4
--- /dev/null
+++ b/lab1/validate.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Check for unwanted files
+for file in *; do
+  if [[ $file != "main.js" && $file != "main_test.js" && $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 lab1-XXXXXXXXXX)
+
+cd $tmp_dir
+
+rm -rf *
+cp $solution_path/*.js .
+result=$($"node" --test --experimental-test-coverage) ; ret=$?
+if [ $ret -ne 0 ] ; then
+  echo "[!] testing fails."
+  exit 1
+else
+  coverage=$(echo "$result" | grep 'all files' | awk -F '|' '{print $2}' | sed 's/ //g')
+  if (( $(echo "$coverage < 100" | bc -l) )); then
+    echo "[!] Coverage is only $coverage%, should be 100%."
+    exit 1
+  else
+    echo "[V] Coverage is 100%, great job!"
+  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
diff --git a/lab2/README.md b/lab2/README.md
new file mode 100644
index 0000000..60a9c80
--- /dev/null
+++ b/lab2/README.md
@@ -0,0 +1,22 @@
+# Lab2
+
+## Introduction
+
+In this lab, you will write unit tests for functions implemented in `main.js`. You can learn how to use classes and functions in it by uncommenting the code in it. (But remember don't commit them on GitHub)
+
+## Requirement
+
+1. Write test cases in `main_test.js` and achieve 100% code coverage. Remember to use Mock, Spy, or Stub when necessary, you need to at least use one of them in your test cases. (100%)
+
+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. 311XXXXXX, 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/lab2/main.js b/lab2/main.js
new file mode 100644
index 0000000..2e159e7
--- /dev/null
+++ b/lab2/main.js
@@ -0,0 +1,81 @@
+const fs = require('fs');
+const util = require('util');
+const readFile = util.promisify(fs.readFile);
+
+class MailSystem {
+    write(name) {
+        console.log('--write mail for ' + name + '--');
+        const context = 'Congrats, ' + name + '!';
+        return context;
+    }
+
+    send(name, context) {
+        console.log('--send mail to ' + name + '--');
+        // Interact with mail system and send mail
+        // random success or failure
+        const success = Math.random() > 0.5;
+        if (success) {
+            console.log('mail sent');
+        } else {
+            console.log('mail failed');
+        }
+        return success;
+    }
+}
+
+class Application {
+    constructor() {
+        this.people = [];
+        this.selected = [];
+        this.mailSystem = new MailSystem();
+        this.getNames().then(([people, selected]) => {
+            this.people = people;
+            this.selected = selected;
+        });
+    }
+
+    async getNames() {
+        const data = await readFile('name_list.txt', 'utf8');
+        const people = data.split('\n');
+        const selected = [];
+        return [people, selected];
+    }
+
+    getRandomPerson() {
+        const i = Math.floor(Math.random() * this.people.length);
+        return this.people[i];
+    }
+
+    selectNextPerson() {
+        console.log('--select next person--');
+        if (this.people.length === this.selected.length) {
+            console.log('all selected');
+            return null;
+        }
+        let person = this.getRandomPerson();
+        while (this.selected.includes(person)) {
+            person = this.getRandomPerson();
+        }
+        this.selected.push(person);
+        return person;
+    }
+
+    notifySelected() {
+        console.log('--notify selected--');
+        for (const x of this.selected) {
+            const context = this.mailSystem.write(x);
+            this.mailSystem.send(x, context);
+        }
+    }
+}
+
+// const app = new Application();
+// app.selectNextPerson();
+// app.selectNextPerson();
+// app.selectNextPerson();
+// app.notifySelected();
+
+module.exports = {
+    Application,
+    MailSystem,
+};
\ No newline at end of file
diff --git a/lab2/main_test.js b/lab2/main_test.js
new file mode 100644
index 0000000..5034468
--- /dev/null
+++ b/lab2/main_test.js
@@ -0,0 +1,6 @@
+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
\ No newline at end of file
diff --git a/lab2/validate.sh b/lab2/validate.sh
new file mode 100755
index 0000000..13b53ed
--- /dev/null
+++ b/lab2/validate.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Check for unwanted files
+for file in *; do
+  if [[ $file != "main.js" && $file != "main_test.js" && $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 lab2-XXXXXXXXXX)
+
+cd $tmp_dir
+
+rm -rf *
+cp $solution_path/*.js .
+result=$($"node" --test --experimental-test-coverage) ; ret=$?
+if [ $ret -ne 0 ] ; then
+  echo "[!] testing fails"
+  exit 1
+else
+  coverage=$(echo "$result" | grep 'all files' | awk -F '|' '{print $2}' | sed 's/ //g')
+  if (( $(echo "$coverage < 100" | bc -l) )); then
+    echo "[!] Coverage is only $coverage%"
+    exit 1
+  else
+    echo "[V] Coverage is 100%"
+  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
diff --git a/lab3/README.md b/lab3/README.md
new file mode 100644
index 0000000..b591ab8
--- /dev/null
+++ b/lab3/README.md
@@ -0,0 +1,29 @@
+# Lab3
+
+## Introduction
+
+In this lab, you will write unit tests for functions implemented in `main.js`. You can learn how to use classes and functions in it by uncommenting the code in it. (But remember don't commit them on GitHub)
+
+## Preparation (Important!!!)
+
+1. Sync fork on GitHub
+2. `git checkout -b lab3` (**NOT** your student ID !!!)
+
+## Requirement
+
+1. (40%) Write test cases in `main_test.js` and achieve 100% code coverage.
+2. (30%) For each function, parameterize their testcases to test the error-results.
+3. (30%) For each function, use at least 3 parameterized testcases to test the non-error-results.
+
+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/lab3/main.js b/lab3/main.js
new file mode 100644
index 0000000..cee5de7
--- /dev/null
+++ b/lab3/main.js
@@ -0,0 +1,34 @@
+class Calculator {
+    exp(x) {
+        if (!Number.isFinite(x)) {
+            throw Error('unsupported operand type');
+        }
+        const result = Math.exp(x);
+        if (result === Infinity) {
+            throw Error('overflow');
+        }
+        return result;
+    }
+
+    log(x) {
+        if (!Number.isFinite(x)) {
+            throw Error('unsupported operand type');
+        }
+        const result = Math.log(x);
+        if (result === -Infinity) {
+            throw Error('math domain error (1)');
+        }
+        if (Number.isNaN(result)) {
+            throw Error('math domain error (2)');
+        }
+        return result;
+    }
+}
+
+// const calculator = new Calculator();
+// console.log(calculator.exp(87));
+// console.log(calculator.log(48763));
+
+module.exports = {
+    Calculator
+};
\ No newline at end of file
diff --git a/lab3/main_test.js b/lab3/main_test.js
new file mode 100644
index 0000000..e6d6414
--- /dev/null
+++ b/lab3/main_test.js
@@ -0,0 +1,5 @@
+const {describe, it} = require('node:test');
+const assert = require('assert');
+const { Calculator } = require('./main');
+
+// TODO: write your tests here
diff --git a/lab3/validate.sh b/lab3/validate.sh
new file mode 100755
index 0000000..7a758fb
--- /dev/null
+++ b/lab3/validate.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Check for unwanted files
+for file in *; do
+  if [[ $file != "main.js" && $file != "main_test.js" && $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 lab3-XXXXXXXXXX)
+
+cd $tmp_dir
+
+rm -rf *
+cp $solution_path/*.js .
+result=$($"node" --test --experimental-test-coverage) ; ret=$?
+if [ $ret -ne 0 ] ; then
+  echo "[!] testing fails"
+  exit 1
+else
+  coverage=$(echo "$result" | grep 'all files' | awk -F '|' '{print $2}' | sed 's/ //g')
+  if (( $(echo "$coverage < 100" | bc -l) )); then
+    echo "[!] Coverage is only $coverage%"
+    exit 1
+  else
+    echo "[V] Coverage is 100%"
+  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