diff --git a/.gitignore b/.gitignore
index b512c09..f06235c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-node_modules
\ No newline at end of file
+node_modules
+dist
diff --git a/.gtconfig/setup-jest.js b/.gtconfig/setup-jest.js
new file mode 100644
index 0000000..1412757
--- /dev/null
+++ b/.gtconfig/setup-jest.js
@@ -0,0 +1,136 @@
+#!/usr/bin/env node
+
+const { execSync } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+
+console.log('🔄 Setting up Jest...');
+
+// Ensure src directory exists
+if (!fs.existsSync('src')) {
+  fs.mkdirSync('src');
+  console.log('✅ Created src directory');
+}
+
+// Clean up Mocha files
+try {
+  if (fs.existsSync('.mocharc.json')) {
+    fs.unlinkSync('.mocharc.json');
+    console.log('✅ Removed .mocharc.json');
+  }
+} catch (error) {
+  console.log('⚠️  Could not remove .mocharc.json:', error.message);
+}
+
+// Uninstall Mocha dependencies
+console.log('📦 Uninstalling Mocha dependencies...');
+try {
+  execSync('npm uninstall @types/chai @types/mocha chai mocha', { stdio: 'inherit' });
+  console.log('✅ Mocha dependencies uninstalled');
+} catch (error) {
+  console.log('⚠️  Some Mocha dependencies may not have been installed');
+}
+
+// Install Jest dependencies
+console.log('📦 Installing Jest dependencies...');
+try {
+  execSync('npm install --save-dev jest ts-jest @types/jest', { stdio: 'inherit' });
+  console.log('✅ Jest dependencies installed');
+} catch (error) {
+  console.error('❌ Failed to install Jest dependencies:', error.message);
+  process.exit(1);
+}
+
+// Create Jest config
+try {
+  const jestConfig = `const { createDefaultPreset } = require("ts-jest");
+
+const tsJestTransformCfg = createDefaultPreset().transform;
+
+/** @type {import("jest").Config} **/
+module.exports = {
+    testEnvironment: "node",
+    transform: {
+        ...tsJestTransformCfg,
+    },
+};`;
+  fs.writeFileSync('jest.config.js', jestConfig);
+  console.log('✅ Created jest.config.js');
+} catch (error) {
+  console.error('❌ Failed to setup Jest config:', error.message);
+  process.exit(1);
+}
+
+// Create Jest test example
+try {
+  const jestTest = `// This is a sample test written for Jest.
+// 
+// If you prefer using Mocha+Chai instead, run \`npm run init:mocha\` in the terminal to setup Mocha dependencies.
+// This will switch your project to use Mocha as the test runner with Chai for assertions.
+
+import assert from "assert";
+
+describe('Jest Test suite', function () {
+    it('should expect to add', function () {
+        assert.equal(2 + 3, 5);
+    });
+});`;
+  fs.writeFileSync('src/main.test.ts', jestTest);
+  console.log('✅ Created Jest test example in src/main.test.ts');
+} catch (error) {
+  console.error('❌ Failed to setup Jest test:', error.message);
+  process.exit(1);
+}
+
+// Update package.json test script
+try {
+  const packageJsonPath = 'package.json';
+  if (fs.existsSync(packageJsonPath)) {
+    const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
+    packageJson.scripts = packageJson.scripts || {};
+    packageJson.scripts.test = 'jest';
+    fs.writeFileSync(packageJsonPath, JSON.stringify(packageJson, null, 2));
+    console.log('✅ Updated package.json test script');
+  }
+} catch (error) {
+  console.error('❌ Failed to update package.json:', error.message);
+}
+
+console.log('🎉 Jest setup complete! Reloading window now ...');
+
+
+try {
+  const vscodeDir = '.vscode';
+  const settingsFile = path.join(vscodeDir, 'settings.json');
+
+  if (!fs.existsSync(vscodeDir)) {
+    fs.mkdirSync(vscodeDir);
+  }
+
+  let settings = {};
+  if (fs.existsSync(settingsFile)) {
+    try {
+      const settingsContent = fs.readFileSync(settingsFile, 'utf8');
+      settings = JSON.parse(settingsContent);
+    } catch (error) {
+      console.log('⚠️  Could not parse existing settings.json, creating new one');
+      settings = {};
+    }
+  }
+
+  // Increment reload trigger counter
+  const currentCounter = settings["live-interview-companion.reloadTriggerCounter"] || 0;
+  settings["live-interview-companion.reloadTriggerCounter"] = currentCounter + 1;
+  settings["jest.enable"] = true;
+  settings["jest.runMode"] = "on-demand”;
+
+  // Write updated settings
+  console.log(`🔄 Reloading workspace (counter: ${currentCounter + 1})`);
+  fs.writeFileSync(settingsFile, JSON.stringify(settings, null, 2));
+} catch (error) {
+  console.log('⚠️  Could not reload workspace:', error.message);
+  console.log('Please reload the window manually...');
+}
+
+console.log('✅ Reloaded workspace');
+console.log('🎉 Workspace setup complete! Run "npm test" to run tests.');
diff --git a/.gtconfig/setup-mocha.js b/.gtconfig/setup-mocha.js
new file mode 100644
index 0000000..c944ef7
--- /dev/null
+++ b/.gtconfig/setup-mocha.js
@@ -0,0 +1,130 @@
+#!/usr/bin/env node
+
+const { execSync } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+
+console.log('🔄 Setting up Mocha...');
+
+// Ensure src directory exists
+if (!fs.existsSync('src')) {
+  fs.mkdirSync('src');
+  console.log('✅ Created src directory');
+}
+
+// Clean up Jest files
+try {
+  if (fs.existsSync('jest.config.js')) {
+    fs.unlinkSync('jest.config.js');
+    console.log('✅ Removed jest.config.js');
+  }
+} catch (error) {
+  console.log('⚠️  Could not remove jest.config.js:', error.message);
+}
+
+// Uninstall Jest dependencies
+console.log('📦 Uninstalling Jest dependencies...');
+try {
+  execSync('npm uninstall jest ts-jest @types/jest', { stdio: 'inherit' });
+  console.log('✅ Jest dependencies uninstalled');
+} catch (error) {
+  console.log('⚠️  Some Jest dependencies may not have been installed');
+}
+
+// Install Mocha dependencies
+console.log('📦 Installing Mocha dependencies...');
+try {
+  execSync('npm install --save-dev @types/chai @types/mocha chai mocha ts-node', { stdio: 'inherit' });
+  console.log('✅ Mocha dependencies installed');
+} catch (error) {
+  console.error('❌ Failed to install Mocha dependencies:', error.message);
+  process.exit(1);
+}
+
+// Create Mocha config
+try {
+  const mochaConfig = `{
+    "extension": [
+        "ts"
+    ],
+    "spec": "src/**/*.test.ts",
+    "require": "ts-node/register"
+}`;
+  fs.writeFileSync('.mocharc.json', mochaConfig);
+  console.log('✅ Created .mocharc.json');
+} catch (error) {
+  console.error('❌ Failed to setup Mocha config:', error.message);
+  process.exit(1);
+}
+
+// Create Mocha test example
+try {
+  const mochaTest = `// We support Mocha + Chai for unit testing by default.
+// 
+// If you prefer using Jest instead, run \`npm run init:jest\` in the terminal to setup Jest dependencies.
+// This will switch your project to use Jest which includes built-in assertions and mocking capabilities.
+
+import { assert } from 'chai';
+
+describe('Mocha Test suite', function () {
+    it('should expect to add', function () {
+        assert.equal(2 + 3, 5);
+    });
+});`;
+  fs.writeFileSync('src/main.test.ts', mochaTest);
+  console.log('✅ Created Mocha test example in src/main.test.ts');
+} catch (error) {
+  console.error('❌ Failed to setup Mocha test:', error.message);
+  process.exit(1);
+}
+
+// Update package.json test script
+try {
+  const packageJsonPath = 'package.json';
+  if (fs.existsSync(packageJsonPath)) {
+    const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
+    packageJson.scripts = packageJson.scripts || {};
+    packageJson.scripts.test = 'mocha';
+    fs.writeFileSync(packageJsonPath, JSON.stringify(packageJson, null, 2));
+    console.log('✅ Updated package.json test script');
+  }
+} catch (error) {
+  console.error('❌ Failed to update package.json:', error.message);
+}
+
+console.log('🎉 Mocha setup complete! Reloading window now ...');
+
+try {
+  const vscodeDir = '.vscode';
+  const settingsFile = path.join(vscodeDir, 'settings.json');
+
+  if (!fs.existsSync(vscodeDir)) {
+    fs.mkdirSync(vscodeDir);
+  }
+
+  let settings = {};
+  if (fs.existsSync(settingsFile)) {
+    try {
+      const settingsContent = fs.readFileSync(settingsFile, 'utf8');
+      settings = JSON.parse(settingsContent);
+    } catch (error) {
+      console.log('⚠️  Could not parse existing settings.json, creating new one');
+      settings = {};
+    }
+  }
+
+  // Increment reload trigger counter
+  const currentCounter = settings["live-interview-companion.reloadTriggerCounter"] || 0;
+  settings["live-interview-companion.reloadTriggerCounter"] = currentCounter + 1;
+  settings["jest.enable"] = false;
+
+  // Write updated settings
+  console.log(`🔄 Reloading workspace (counter: ${currentCounter + 1})`);
+  fs.writeFileSync(settingsFile, JSON.stringify(settings, null, 2));
+} catch (error) {
+  console.log('⚠️  Could not reload workspace:', error.message);
+  console.log('Please reload the window manually...');
+}
+
+console.log('✅ Reloaded workspace');
+console.log('🎉 Workspace setup complete! Run "npm test" to run tests.');
diff --git a/.gtignore b/.gtignore
index 135d1c5..105199e 100644
--- a/.gtignore
+++ b/.gtignore
@@ -6,5 +6,10 @@ package.json
 yarn.lock
 package-lock.json
 .theia/
+.vscode/
 # Ignore all node_modules folders
 **/node_modules/
+.gtconfig/
+.mocharc.json
+jest.config.js
+dist/
diff --git a/.mocharc.json b/.mocharc.json
new file mode 100644
index 0000000..0d53a44
--- /dev/null
+++ b/.mocharc.json
@@ -0,0 +1,7 @@
+{
+  "extension": [
+    "ts"
+  ],
+  "spec": "src/**/*.test.ts",
+  "require": "ts-node/register"
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..d7abae4
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,4 @@
+{
+  "jest.runMode": "on-demand",
+  "editor.formatOnSave": true
+}
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..295706a
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,22 @@
+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Install Dependencies",
+      "type": "shell",
+      "command": "npm install",
+      "group": "build",
+      "presentation": {
+        "echo": true,
+        "reveal": "never",
+        "focus": false,
+        "panel": "dedicated",
+        "close": true
+      },
+      "runOptions": {
+        "runOn": "folderOpen"
+      },
+      "problemMatcher": []
+    }
+  ]
+}
diff --git a/package.json b/package.json
index 3b85373..ec8d0c7 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,18 @@
   "name": "typescript-interview-command-line-starter-kit",
   "version": "0.1.0",
   "devDependencies": {
-    "@types/node": "^20.19.7"
+    "@types/chai": "^5.2.2",
+    "@types/mocha": "^10.0.10",
+    "@types/node": "^24.0.14",
+    "chai": "^5.2.1",
+    "mocha": "^11.7.1",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.8.3"
   },
-   "license": "MIT"
+  "scripts": {
+    "test": "mocha",
+    "init:jest": "node .gtconfig/setup-jest.js",
+    "init:mocha": "node .gtconfig/setup-mocha.js"
+  },
+  "license": "MIT"
 }
diff --git a/src/main.test.ts b/src/main.test.ts
new file mode 100644
index 0000000..5497d78
--- /dev/null
+++ b/src/main.test.ts
@@ -0,0 +1,12 @@
+// We support Mocha + Chai for unit testing by default.
+// 
+// If you prefer using Jest instead, run `npm run init:jest` in the terminal to setup Jest dependencies.
+// This will switch your project to use Jest which includes built-in assertions and mocking capabilities.
+
+import { assert } from 'chai';
+
+describe('Mocha Test suite', function () {
+  it('should expect to add', function () {
+    assert.equal(2 + 3, 5);
+  });
+});
diff --git a/tsconfig.json b/tsconfig.json
index 59517da..92e1bfc 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,14 +6,15 @@
     "moduleResolution": "node",
     "sourceMap": true,
     "outDir": "dist",
-    "typeRoots": [ 
-      "./node_modules/@types",
-      "/usr/lib/node_modules/@types", 
-      "/usr/local/share/.config/yarn/global/node_modules/@types" 
-    ]
   },
   "lib": [
     "es2015"
   ],
-  "include": ["src/**/*"],
+  "include": [
+    "src/**/*"
+  ],
+  "exclude": [
+    "node_modules",
+    ".gtconfig"
+  ],
 }