test: add test for not returning res object

Author: ggurkal

lib/e2e.test.ts

@@ -4,7 +4,7 @@ import express from 'express';
 import type { NextApiRequest, NextApiResponse } from 'next';
 import request from 'supertest';
 import { createHandler } from './createHandler';
-import { Body, Delete, Get, Header, HttpCode, Post, Put, Query, Req, Response, SetHeader } from './decorators';
+import { Body, Delete, Get, Header, HttpCode, Post, Put, Query, Req, Res, Response, SetHeader } from './decorators';
 import { ParseBooleanPipe } from './pipes/parseBoolean.pipe';
 import { ParseNumberPipe } from './pipes/parseNumber.pipe';
 
@@ -62,8 +62,12 @@ class TestHandler {
 
   @Put()
   @SetHeader('X-Method', 'update')
-  public update(@Header('Content-Type') contentType: string, @Query('id') id: string, @Body() body: any) {
-    return { contentType, id, receivedBody: body, test: this.testField };
+  public update(@Req() req: NextApiRequest, @Res() res: NextApiResponse) {
+    const { headers, query, body } = req;
+    const { 'content-type': contentType } = headers;
+    const { id } = query;
+
+    res.status(200).json({ contentType, id, receivedBody: body, test: this.testField });
   }
 
   @Delete()