Adding tests with MockServer

composer.json

@@ -27,6 +27,7 @@
         "symfony/serializer": "^5.4 || ^6.3"
     },
     "require-dev": {
+        "donatj/mock-webserver": "^2.7",
         "phpunit/phpunit": "^10.2",
         "symfony/property-access": "^5.4 || ^6.3"
     },

tests/Core/FunctionalRetrofitTest.php

@@ -0,0 +1,83 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Retrofit\Tests\Core;
+
+use donatj\MockWebServer\MockWebServer;
+use donatj\MockWebServer\Response;
+use GuzzleHttp\Client;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+use Retrofit\Client\Guzzle7\Guzzle7HttpClient;
+use Retrofit\Converter\SymfonySerializer\SymfonySerializerConverterFactory;
+use Retrofit\Core\Retrofit;
+use Retrofit\Tests\Fixtures\Api\FullyValidApi;
+use Symfony\Component\Serializer\Serializer;
+
+class FunctionalRetrofitTest extends TestCase
+{
+    private MockWebServer $mockWebServer;
+
+    private FullyValidApi $fullyValidApi;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+//        $this->mockWebServer = new MockWebServer();
+//        $this->mockWebServer->start();
+
+//        $this->fullyValidApi = $this->createFullyValidApiMock();
+    }
+
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+
+        $this->mockWebServer->stop();
+    }
+
+    #[Test]
+    public function shouldGenerateProperResponse(): void
+    {
+        // given
+        $this->mockWebServer = new MockWebServer();
+        $this->mockWebServer->start();
+        $url = $this->mockWebServer->setResponseOfPath('/info/sample', new Response('foo bar content'));
+
+        $retrofit = Retrofit::Builder()
+            ->baseUrl($url)
+            ->client(new Guzzle7HttpClient(new Client()))
+            ->addConverterFactory(new SymfonySerializerConverterFactory(new Serializer()))
+            ->build();
+
+        /** @var FullyValidApi $service */
+        $this->fullyValidApi = $retrofit->create(FullyValidApi::class);
+
+        $content = file_get_contents($url);
+
+//        $this->fullyValidApi = $this->createFullyValidApiMock();
+
+        $call = $this->fullyValidApi->getInfo('sample-user');
+
+        // when
+        $result = $call->request();
+
+        // then
+        $body = $result->getBody();
+        $this->assertEquals('foo bar content', $body->getContents());
+    }
+
+    private function createFullyValidApiMock(): FullyValidApi
+    {
+        $retrofit = Retrofit::Builder()
+            ->baseUrl($this->mockWebServer->getServerRoot())
+            ->client(new Guzzle7HttpClient(new Client()))
+            ->addConverterFactory(new SymfonySerializerConverterFactory(new Serializer()))
+            ->build();
+
+        /** @var FullyValidApi $service */
+        return $retrofit->create(FullyValidApi::class);
+    }
+}