add helloworld API endpoint for product module with test case

03_source/cms_backend/src/app/api/product/helloworld/route.ts

@@ -0,0 +1,16 @@
+import type { NextRequest, NextResponse } from 'next/server';
+
+import { STATUS, response, handleError } from 'src/utils/response';
+
+/**
+ ***************************************
+ * GET - helloworld
+ ***************************************
+ */
+export async function GET(req: NextRequest, res: NextResponse) {
+  try {
+    return response({ helloworld: 'product' }, STATUS.OK);
+  } catch (error) {
+    return handleError('Helloworld - Get all', error);
+  }
+}

03_source/cms_backend/src/app/api/product/helloworld/test.http

@@ -0,0 +1,4 @@
+###
+GET /api/product/helloworld HTTP/1.1
+Host: localhost:7272
+