Feature - Testing with express

package.json

@@ -4,7 +4,8 @@
   "description": "SSR Fetch for Next JS",
   "main": "lib/index.js",
   "scripts": {
-    "build": "npx tsc"
+    "build": "npx tsc",
+    "test": "jest"
   },
   "repository": {
     "type": "git",
@@ -22,6 +23,11 @@
   "author": "arn-ob",
   "license": "MIT",
   "devDependencies": {
+    "@types/jest": "^27.5.0",
+    "@types/mocha": "^9.1.1",
+    "express": "^4.18.1",
+    "jest": "^28.1.0",
+    "supertest": "^6.2.3",
     "typescript": "^4.6.2"
   }
 }

test/express.test.ts

@@ -0,0 +1,69 @@
+const express = require('express');
+const request = require("supertest");
+
+// Create Express Application
+function ExpressInit() {
+
+    let exp = express();
+    let router = express.Router();
+
+    router.route('/').get(function (req, res) {
+        return res.json({ status: true });
+    });
+
+    router.route('/').post(function (req, res) {
+        return res.json({ status: true });
+    });
+
+    // router
+    exp.use(router);
+
+    return exp;
+}
+
+
+describe('GET - Testing With Express', function () {
+    let exp;
+
+    // Called once before any of the tests in this block begin.
+    beforeAll(function (done) {
+        exp = ExpressInit();
+        exp.listen(function (err) {
+            if (err) { 
+                console.error("Express init Error");
+                return done(err); 
+            }
+
+            console.log("Express init Done");
+            done();
+        });
+    });
+
+    it('Return request from GET', function (done) {
+        request(exp)
+            .get('/')
+            .expect(200, function (err, res) {
+                if (err) { 
+                    console.error("Request Error");
+                    return done(err); 
+                }
+
+                console.log("GET - Request Body", res.body);
+
+                expect(res.statusCode).toBe(200);
+                done();
+            });
+    });
+
+    it('Return request from POST', function (done) {
+        request(exp)
+            .post('/')
+            .expect(200, function (err, res) {
+                if (err) { return done(err); }
+
+                console.log("POST - Request Body", res.body);
+                expect(res.statusCode).toBe(200);
+                done();
+            });
+    });
+});

test/init.test.ts

@@ -0,0 +1,15 @@
+/**
+ * 
+ * @param a number
+ * @param b number
+ * @returns sum
+ */
+
+function sum(a, b) {
+    return a + b;
+}
+
+test('adds 1 + 2 to equal 3', () => {
+    expect(sum(1, 2)).toBe(3);
+});
+