diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..6c1e9ae
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,5 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+export default {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};
\ No newline at end of file
diff --git a/package.json b/package.json
index e8573bc..7189d84 100644
--- a/package.json
+++ b/package.json
@@ -4,15 +4,21 @@
   "main": "src/index.ts",
   "repository": "git@github.com:poker-io/pokerio-server.git",
   "author": "Karol Wąsowski <wasowski02@protonmail.com>",
+  "type": "module",
   "license": "MIT",
   "scripts": {
-    "start": "tsc && node dist/index.js"
+    "start": "tsc && node dist/index.js",
+    "build": "tsc",
+    "test": "jest src/tests"
   },
   "devDependencies": {
     "@types/express": "^4.17.17",
+    "@types/jest": "^29.4.4",
+    "ts-jest": "^29.0.5",
     "typescript": "^4.9.5"
   },
   "dependencies": {
-    "express": "^4.18.2"
+    "express": "^4.18.2",
+    "jest": "^29.5.0"
   }
 }
diff --git a/src/index.ts b/src/index.ts
index 0c46604..2bfe302 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,7 +1,7 @@
 import express from "express"
 
 const app = express()
-const port = 42069
+export const port = 42069
 
 app.get('/test', (req, res) => {
   res.send('Hello from typescript express!')
@@ -9,4 +9,4 @@ app.get('/test', (req, res) => {
 
 app.listen(port, () => {
   console.log(`[server]: Server is running at localhost:${port}`)
-})
\ No newline at end of file
+})
diff --git a/src/tests/index.test.ts b/src/tests/index.test.ts
new file mode 100644
index 0000000..340d67d
--- /dev/null
+++ b/src/tests/index.test.ts
@@ -0,0 +1,8 @@
+import {port} from '../index'
+
+test('Simple test', async () => {
+        // for some reason using port from imported varaible gives weird errors
+	let response = await fetch('http://localhost:42069/test')
+	let text = await response.text();
+	expect(text).toEqual('Hello from typescript express!')
+});
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index 295cb9f..20e5866 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,5 @@
 {
   "compilerOptions": {
-    "module": "commonjs",
     "esModuleInterop": true,
     "target": "es6",
     "moduleResolution": "node",