diff --git a/tests/customization.test.js b/tests/customization.test.js
new file mode 100644
index 000000000..084cb14b4
--- /dev/null
+++ b/tests/customization.test.js
@@ -0,0 +1,23 @@
+// tests/customization.test.js
+const SettingsManager = require('../customization/settings');
+const ThemeManager = require('../customization/themes');
+
+describe('Customization Module', () => {
+    let settingsManager;
+    let themeManager;
+
+    beforeEach(() => {
+        settingsManager = new SettingsManager();
+        themeManager = new ThemeManager();
+    });
+
+    test('should create user settings correctly', () => {
+        const userSettings = settingsManager.createUserSettings('user123');
+        expect(userSettings.getSettings()).toHaveProperty('language', 'en');
+    });
+
+    test('should add a new theme correctly', () => {
+        const theme = themeManager.addTheme('Dark Mode', { backgroundColor: '#000', textColor: '#fff' });
+        expect(theme.name).toBe('Dark Mode');
+    });
+});