made some basic structure changes and made some tests too

src/routes/healthcheck/test.js

@@ -0,0 +1,19 @@
+// src/routes/healthcheck/test.js
+
+import request from 'supertest'
+import app from '../../app'
+
+describe('Health Check Endpoint', () => {
+	it('should respond with status up', async () => {
+		const response = await request(app).get('/healthcheck')
+
+		expect(response.status).toBe(200)
+		expect(response.body).toEqual({ status: 'UP' })
+	})
+
+	it('should return a JSON response', async () => {
+		const response = await request(app).get('/healthcheck')
+
+		expect(response.type).toBe('application/json')
+	})
+})