feat(server.ts): add server to handle incoming requests

src/__tests__/server.spec.ts

@@ -0,0 +1,14 @@
+import app from '../app';
+
+jest.mock('../app', () => ({
+  listen: jest.fn((port: number, fn: () => void) => fn()),
+  get: () => 424242
+}));
+const mockApp = app as jest.Mocked<typeof app>;
+
+describe('server', () => {
+  it('should listen to port provided by the app', () => {
+    require('../server');
+    expect(mockApp.listen).toHaveBeenCalledWith(424242, expect.any(Function));
+  });
+});

src/server.ts

@@ -0,0 +1,8 @@
+import app from './app';
+import { info } from './logger';
+
+const server = app.listen(app.get('port'), () => {
+  info(`Server is running on port ${app.get('port')}`);
+});
+
+export default server;