diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..d444a8c
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,20 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended"
+  ],
+  "parserOptions": {
+    "ecmaVersion": "latest",
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-console": "warn",
+    "no-unused-vars": "warn",
+    "semi": ["error", "always"],
+    "quotes": ["error", "single"]
+  }
+}
diff --git a/tests/example.test.js b/tests/example.test.js
new file mode 100644
index 0000000..9939ad6
--- /dev/null
+++ b/tests/example.test.js
@@ -0,0 +1,19 @@
+// Example test file
+// Install testing framework: npm install --save-dev jest
+
+describe('Example Test Suite', () => {
+  test('should add two numbers correctly', () => {
+    const result = 2 + 2;
+    expect(result).toBe(4);
+  });
+
+  test('should handle edge cases', () => {
+    expect(null).toBeNull();
+    expect(undefined).toBeUndefined();
+  });
+});
+
+// Add this to package.json scripts:
+// "test": "jest"
+// "test:watch": "jest --watch"
+// "test:coverage": "jest --coverage"