* initial version

test/AppTest/Handler/PingHandlerTest.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AppTest\Handler;
+
+use App\Handler\PingHandler;
+use Laminas\Diactoros\Response\JsonResponse;
+use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
+use Psr\Http\Message\ServerRequestInterface;
+
+use function json_decode;
+
+class PingHandlerTest extends TestCase
+{
+    use ProphecyTrait;
+
+    public function testResponse()
+    {
+        $pingHandler = new PingHandler();
+        $response    = $pingHandler->handle(
+            $this->prophesize(ServerRequestInterface::class)->reveal()
+        );
+
+        $json = json_decode((string) $response->getBody());
+
+        $this->assertInstanceOf(JsonResponse::class, $response);
+        $this->assertTrue(isset($json->ack));
+    }
+}