Removed dotenv

package.json

@@ -18,8 +18,5 @@
     "eslint": "^8.28.0",
     "eslint-config-airbnb": "^19.0.4",
     "eslint-plugin-import": "^2.26.0"
-  },
-  "dependencies": {
-    "dotenv": "^16.0.3"
   }
 }

server/app.js

@@ -1,8 +1,7 @@
-require('dotenv').config();
 const http = require('http');
-const mathUtils = require('./utils/math.js'); // grab utils for simple math functions
+const mathUtils = require('./utils/math.js'); 
 
-const port = 3000;
+const port = process.env.PORT || process.env.NODE_PORT || 3000;
 
 const onRequest = (req, res) => {
   let num = mathUtils.add(10, 15); // should get capped to 20
@@ -15,12 +14,14 @@ const onRequest = (req, res) => {
   res.end();
 };
 
-const app = http.createServer(onRequest).listen(port);
+const app = http.createServer(onRequest).listen(port, () => {
+  console.log(`Server started on port ${port}`);
+});
 
-console.log(`Server started on port ${port}`);
-
-// Check if test environment, if so export server app as a global variable for testing
+/* Check if test environment, if so export server app so that
+   we can test it in app.test.js. Jest will automatically set
+   process.env.NODE_ENV to 'test' when it's running.
+*/
 if (process.env.NODE_ENV === 'test') {
-  console.log('setting env to test');
   module.exports = app;
 }