Test setup

jest.config.js

@@ -0,0 +1,5 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+export default {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

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",
+    "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",
+    "node-fetch": "^3.3.1"
   }
 }

src/index.ts

@@ -1,12 +1,12 @@
 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!')
 })
 
 app.listen(port, () => {
   console.log(`[server]: Server is running at localhost:${port}`)
-})
+})

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!')
+});