Silex gets functional testing through its own WebTestCase

src/Silex/WebTestCase.php

+<?php
+
+namespace Silex;
+
+use Symfony\Component\HttpKernel\Client;
+use Symfony\Component\HttpKernel\Test\WebTestCase as BaseWebTestCase;
+
+/*
+ * This file is part of the Silex framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.org>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * WebTestCase is the base class for functional tests.
+ *
+ * @author Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+abstract class WebTestCase extends BaseWebTestCase
+{
+    protected $app;
+
+    /**
+     * PHPUnit setUp for setting up the application.
+     *
+     * Note: Child classes that define a setUp method must call
+     * parent::setUp().
+     *
+     * @return Symfony\Component\HttpKernel\HttpKernel
+     */
+    public function setUp()
+    {
+        $this->app = $this->createApp();
+    }
+
+    /**
+     * Create the application (HttpKernel, most likely Framework).
+     *
+     * @return Symfony\Component\HttpKernel\HttpKernel
+     */
+    abstract public function createApp();
+
+    /**
+     * Creates a Client.
+     *
+     * @param array   $options An array of options to pass to the createKernel class
+     * @param array   $server  An array of server parameters
+     *
+     * @return Client A Client instance
+     */
+    public function createClient(array $options = array(), array $server = array())
+    {
+        return new Client($this->app);
+    }
+}

tests/Silex/Tests/WebTestCaseTest.php

+<?php
+
+namespace Silex\Tests;
+
+use Silex\Framework;
+use Silex\WebTestCase;
+
+/*
+ * This file is part of the Silex framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.org>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * Functional test cases.
+ *
+ * @author Fabien Potencier <fabien.potencier@symfony-project.org>
+ */
+class WebTestCaseTest extends WebTestCase
+{
+    public function createApp()
+    {
+        $app = new Framework();
+        $app->get('/hello', function() {
+            return 'world';
+        });
+
+        return $app;
+    }
+
+    public function testGetHello()
+    {
+        $client = $this->createClient();
+
+        $client->request('GET', '/hello');
+        $response = $client->getResponse();
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('world', $response->getContent());
+    }
+}