feature #1607 Drop support for older versions of PHP and Symfony (fabpot)

This PR was squashed before being merged into the 2.3.x-dev branch (closes #1607).

Discussion
----------

Drop support for older versions of PHP and Symfony

Let's make it much simpler to maintain future versions of Silex. This pull request does the following (@Ocramius would be proud of me :)):

 * drop support for Twig < 2.0
 * drop support for PHP < 7.1
 * drop support for Symfony 2.x and 3.x

Commits
-------

816f4591 removed obsolete code
63851cc6 use namespaced PHPUnit
182ecf05 removed obsolete code
f1f9ce42 dropped support for older versions of PHP and Symfony

.travis.yml

@@ -14,31 +14,6 @@ cache:
 
 before_install:
     - phpenv config-rm xdebug.ini
-
-    # Twig 1.x
-    - if [[ $TWIG_VERSION != 2.0 ]]; then sed -i 's/~1.8|~2.0/~1.8/g' composer.json; fi
-
-    # Symfony 2.8
-    - if [[ $SYMFONY_DEPS_VERSION = 2.8 ]]; then sed -i 's/~2\.8|^3\.0/2.8.*/g' composer.json; fi
-    # Symfony 3.3
-    - |
-      if [[ $SYMFONY_DEPS_VERSION = 3.3 ]]; then
-          sed -i 's/~2\.8|^3\.0/3.3.*/g' composer.json;
-          composer require --no-update symfony/web-link:3.3.*
-      fi
-    # Symfony 3.4
-    - |
-      if [[ $SYMFONY_DEPS_VERSION = 3.4 ]]; then
-          sed -i 's/~2\.8|^3\.0/3.4.*/g' composer.json;
-          composer require --no-update symfony/web-link:3.4.*
-      fi
-    # Symfony 4.0
-    - |
-      if [[ $SYMFONY_DEPS_VERSION = 4.0 ]]; then
-          sed -i 's/~2\.8|^3\.0/4.0.*/g' composer.json;
-          composer require --no-update symfony/web-link:4.0.*
-      fi
-
     - composer update --no-suggest
 
 install:
@@ -48,18 +23,5 @@ script: ./vendor/bin/simple-phpunit
 
 matrix:
     include:
-        - php: 5.5
-        - php: 5.6
-          env: TWIG_VERSION=2.0
-        - php: 5.6
-          env: SYMFONY_DEPS_VERSION=2.8
-        - php: 5.6
-          env: SYMFONY_DEPS_VERSION=3.3
-        - php: 5.6
-          env: SYMFONY_DEPS_VERSION=3.4
-        - php: 7.2
-          env: SYMFONY_DEPS_VERSION=4.0
-        - php: 5.6
-        - php: 7.0
         - php: 7.1
         - php: 7.2

composer.json

@@ -15,43 +15,40 @@
         }
     ],
     "require": {
-        "php": ">=5.5.9",
-        "pimple/pimple": "~3.0",
-        "symfony/event-dispatcher": "~2.8|^3.4|^4.0",
-        "symfony/http-foundation": "~2.8|^3.4|^4.0",
-        "symfony/http-kernel": "~2.8|^3.4|^4.0",
-        "symfony/routing": "~2.8|^3.4|^4.0"
+        "php": ">=7.1.3",
+        "pimple/pimple": "^3.0",
+        "symfony/event-dispatcher": "^4.0",
+        "symfony/http-foundation": "^4.0",
+        "symfony/http-kernel": "^4.0",
+        "symfony/routing": "^4.0"
     },
     "require-dev": {
-        "symfony/asset": "~2.8|^3.4|^4.0",
-        "symfony/expression-language": "~2.8|^3.4|^4.0",
-        "symfony/security": "~2.8|^3.4|^4.0",
-        "symfony/config": "~2.8|^3.4|^4.0",
-        "symfony/form": "~2.8|^3.4|^4.0",
-        "symfony/browser-kit": "~2.8|^3.4|^4.0",
-        "symfony/css-selector": "~2.8|^3.4|^4.0",
-        "symfony/debug": "~2.8|^3.4|^4.0",
-        "symfony/dom-crawler": "~2.8|^3.4|^4.0",
-        "symfony/finder": "~2.8|^3.4|^4.0",
-        "symfony/intl": "~2.8|^3.4|^4.0",
-        "symfony/monolog-bridge": "~2.8|^3.4|^4.0",
-        "symfony/doctrine-bridge": "~2.8|^3.4|^4.0",
-        "symfony/options-resolver": "~2.8|^3.4|^4.0",
+        "symfony/asset": "^4.0",
+        "symfony/expression-language": "^4.0",
+        "symfony/security": "^4.0",
+        "symfony/config": "^4.0",
+        "symfony/form": "^4.0",
+        "symfony/browser-kit": "^4.0",
+        "symfony/css-selector": "^4.0",
+        "symfony/debug": "^4.0",
+        "symfony/dom-crawler": "^4.0",
+        "symfony/finder": "^4.0",
+        "symfony/intl": "^4.0",
+        "symfony/monolog-bridge": "^4.0",
+        "symfony/doctrine-bridge": "^4.0",
+        "symfony/options-resolver": "^4.0",
         "symfony/phpunit-bridge": "^3.2",
-        "symfony/process": "~2.8|^3.4|^4.0",
-        "symfony/serializer": "~2.8|^3.4|^4.0",
-        "symfony/translation": "~2.8|^3.4|^4.0",
-        "symfony/twig-bridge": "~2.8|^3.4|^4.0",
-        "symfony/validator": "~2.8|^3.4|^4.0",
-        "symfony/var-dumper": "~2.8|^3.4|^4.0",
-        "twig/twig": "~1.30|~2.0",
-        "doctrine/dbal": "~2.2",
-        "swiftmailer/swiftmailer": "~5",
+        "symfony/process": "^4.0",
+        "symfony/serializer": "^4.0",
+        "symfony/translation": "^4.0",
+        "symfony/twig-bridge": "^4.0",
+        "symfony/validator": "^4.0",
+        "symfony/var-dumper": "^4.0",
+        "twig/twig": "^2.0",
+        "doctrine/dbal": "^2.2",
+        "swiftmailer/swiftmailer": "^5",
         "monolog/monolog": "^1.4.1",
-        "symfony/web-link": "^3.4|^4.0"
-    },
-    "conflict": {
-        "phpunit/phpunit": "<4.8.35 || >= 5.0, <5.4.3"
+        "symfony/web-link": "^4.0"
     },
     "replace": {
         "silex/api": "self.version",

doc/changelog.rst

@@ -9,6 +9,9 @@ Changelog
  * allow setting custom status code on exception response with Symfony 3.3+
  * made CSRF extension work with Validator translations domain
  * fixed Security provider context usage
+ * dropped support for Twig < 2.0
+ * dropped support for PHP < 7.1
+ * dropped support for Symfony 2.x and 3.x
  * added support for Symfony 4
 
 2.2.3 (2018-02-25)

doc/testing.rst

@@ -26,10 +26,12 @@ PHPUnit
 `PHPUnit <https://github.com/sebastianbergmann/phpunit>`_ is the de-facto
 standard testing framework for PHP. It was built for writing unit tests, but it
 can be used for functional tests too. You write tests by creating a new class,
-that extends the ``PHPUnit_Framework_TestCase``. Your test cases are methods
+that extends the ``PHPUnit\Framework\TestCase``. Your test cases are methods
 prefixed with ``test``::
 
-    class ContactFormTest extends \PHPUnit_Framework_TestCase
+    use PHPUnit\Framework\TestCase;
+
+    class ContactFormTest extends TestCase
     {
         public function testInitialPage()
         {

src/Silex/ControllerResolver.php

-<?php
-
-/*
- * This file is part of the Silex framework.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Silex;
-
-use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Controller\ControllerResolver as BaseControllerResolver;
-use Symfony\Component\HttpFoundation\Request;
-
-/**
- * Adds Application as a valid argument for controllers.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated This class can be dropped once Symfony 3.0 is not supported anymore.
- */
-class ControllerResolver extends BaseControllerResolver
-{
-    protected $app;
-
-    /**
-     * Constructor.
-     *
-     * @param Application     $app    An Application instance
-     * @param LoggerInterface $logger A LoggerInterface instance
-     */
-    public function __construct(Application $app, LoggerInterface $logger = null)
-    {
-        $this->app = $app;
-
-        parent::__construct($logger);
-    }
-
-    protected function doGetArguments(Request $request, $controller, array $parameters)
-    {
-        foreach ($parameters as $param) {
-            if ($param->getClass() && $param->getClass()->isInstance($this->app)) {
-                $request->attributes->set($param->getName(), $this->app);
-
-                break;
-            }
-        }
-
-        return parent::doGetArguments($request, $controller, $parameters);
-    }
-}

src/Silex/Provider/AssetServiceProvider.php

@@ -72,10 +72,6 @@ class AssetServiceProvider implements ServiceProviderInterface
             }
 
             if ($jsonManifestPath) {
-                if (!class_exists('Symfony\Component\Asset\VersionStrategy\JsonManifestVersionStrategy')) {
-                    throw new \RuntimeException('You must require symfony/asset >= 3.3 to use JSON manifest version strategy.');
-                }
-
                 return new JsonManifestVersionStrategy($jsonManifestPath);
             }
 

src/Silex/Provider/HttpKernelServiceProvider.php

@@ -7,23 +7,17 @@ use Pimple\ServiceProviderInterface;
 use Silex\Api\EventListenerProviderInterface;
 use Silex\AppArgumentValueResolver;
 use Silex\CallbackResolver;
-use Silex\ControllerResolver;
 use Silex\EventListener\ConverterListener;
 use Silex\EventListener\MiddlewareListener;
 use Silex\EventListener\StringToResponseListener;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpKernel\Controller\ArgumentResolver;
-use Symfony\Component\HttpKernel\Controller\ArgumentResolver\RequestAttributeValueResolver;
-use Symfony\Component\HttpKernel\Controller\ArgumentResolver\RequestValueResolver;
-use Symfony\Component\HttpKernel\Controller\ArgumentResolver\DefaultValueResolver;
-use Symfony\Component\HttpKernel\Controller\ArgumentResolver\VariadicValueResolver;
-use Symfony\Component\HttpKernel\Controller\ControllerResolver as SfControllerResolver;
+use Symfony\Component\HttpKernel\Controller\ControllerResolver;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadataFactory;
 use Symfony\Component\HttpKernel\EventListener\ResponseListener;
 use Symfony\Component\HttpKernel\HttpKernel;
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\WebLink\EventListener\AddLinkHeaderListener;
 use Symfony\Component\WebLink\HttpHeaderSerializer;
 
@@ -35,36 +29,18 @@ class HttpKernelServiceProvider implements ServiceProviderInterface, EventListen
     public function register(Container $app)
     {
         $app['resolver'] = function ($app) {
-            if (Kernel::VERSION_ID >= 30100) {
-                return new SfControllerResolver($app['logger']);
-            }
-
-            return new ControllerResolver($app, $app['logger']);
+            return new ControllerResolver($app['logger']);
         };
 
-        if (Kernel::VERSION_ID >= 30100) {
         $app['argument_metadata_factory'] = function ($app) {
             return new ArgumentMetadataFactory();
         };
         $app['argument_value_resolvers'] = function ($app) {
-                if (Kernel::VERSION_ID < 30200) {
-                    return [
-                        new AppArgumentValueResolver($app),
-                        new RequestAttributeValueResolver(),
-                        new RequestValueResolver(),
-                        new DefaultValueResolver(),
-                        new VariadicValueResolver(),
-                    ];
-                }
-
             return array_merge([new AppArgumentValueResolver($app)], ArgumentResolver::getDefaultArgumentValueResolvers());
         };
-        }
 
         $app['argument_resolver'] = function ($app) {
-            if (Kernel::VERSION_ID >= 30100) {
             return new ArgumentResolver($app['argument_metadata_factory'], $app['argument_value_resolvers']);
-            }
         };
 
         $app['kernel'] = function ($app) {

src/Silex/Provider/MonologServiceProvider.php

@@ -19,7 +19,6 @@ use Monolog\Handler;
 use Monolog\ErrorHandler;
 use Silex\Application;
 use Silex\Api\BootableProviderInterface;
-use Symfony\Bridge\Monolog\Handler\DebugHandler;
 use Symfony\Bridge\Monolog\Handler\FingersCrossed\NotFoundActivationStrategy;
 use Symfony\Bridge\Monolog\Processor\DebugProcessor;
 use Silex\EventListener\LogListener;
@@ -38,12 +37,6 @@ class MonologServiceProvider implements ServiceProviderInterface, BootableProvid
         };
 
         if ($bridge = class_exists('Symfony\Bridge\Monolog\Logger')) {
-            $app['monolog.handler.debug'] = function () use ($app) {
-                $level = MonologServiceProvider::translateLevel($app['monolog.level']);
-
-                return new DebugHandler($level);
-            };
-
             if (isset($app['request_stack'])) {
                 $app['monolog.not_found_activation_strategy'] = function () use ($app) {
                     return new NotFoundActivationStrategy($app['request_stack'], ['^/'], $app['monolog.level']);
@@ -64,11 +57,7 @@ class MonologServiceProvider implements ServiceProviderInterface, BootableProvid
             $log->pushHandler($handler);
 
             if ($app['debug'] && $bridge) {
-                if (class_exists(DebugProcessor::class)) {
                 $log->pushProcessor(new DebugProcessor());
-                } else {
-                    $log->pushHandler($app['monolog.handler.debug']);
-                }
             }
 
             return $log;

src/Silex/Provider/TranslationServiceProvider.php

@@ -13,10 +13,8 @@ namespace Silex\Provider;
 
 use Pimple\Container;
 use Pimple\ServiceProviderInterface;
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Translation\Translator;
 use Symfony\Component\Translation\Formatter\MessageFormatter;
-use Symfony\Component\Translation\MessageSelector;
 use Symfony\Component\Translation\Loader\ArrayLoader;
 use Symfony\Component\Translation\Loader\XliffFileLoader;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
@@ -79,10 +77,6 @@ class TranslationServiceProvider implements ServiceProviderInterface, EventListe
         }
 
         $app['translator.message_selector'] = function () {
-            if (Kernel::VERSION_ID < 30400) {
-                return new MessageSelector();
-            }
-
             return new MessageFormatter();
         };
 

src/Silex/Provider/TwigServiceProvider.php

@@ -25,11 +25,8 @@ use Symfony\Bridge\Twig\Extension\HttpFoundationExtension;
 use Symfony\Bridge\Twig\Extension\HttpKernelExtension;
 use Symfony\Bridge\Twig\Extension\WebLinkExtension;
 use Symfony\Bridge\Twig\Form\TwigRendererEngine;
-use Symfony\Bridge\Twig\Form\TwigRenderer;
 use Symfony\Bridge\Twig\Extension\HttpKernelRuntime;
 use Symfony\Component\Form\FormRenderer;
-use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Component\WebLink\HttpHeaderSerializer;
 
 /**
  * Twig integration for Silex.
@@ -128,14 +125,10 @@ class TwigServiceProvider implements ServiceProviderInterface
                     $app['twig.form.renderer'] = function ($app) {
                         $csrfTokenManager = isset($app['csrf.token_manager']) ? $app['csrf.token_manager'] : null;
 
-                        if (Kernel::VERSION_ID < 30400) {
-                            return new TwigRenderer($app['twig.form.engine'], $csrfTokenManager);
-                        }
-
                         return new FormRenderer($app['twig.form.engine'], $csrfTokenManager);
                     };
 
-                    $twig->addExtension(new FormExtension(class_exists(HttpKernelRuntime::class) ? null : $app['twig.form.renderer']));
+                    $twig->addExtension(new FormExtension());
 
                     // add loader for Symfony built-in form templates
                     $reflected = new \ReflectionClass('Symfony\Bridge\Twig\Extension\FormExtension');
@@ -147,14 +140,9 @@ class TwigServiceProvider implements ServiceProviderInterface
                     $twig->addExtension(new DumpExtension($app['var_dumper.cloner']));
                 }
 
-                if (class_exists(HttpKernelRuntime::class)) {
                 $twig->addRuntimeLoader($app['twig.runtime_loader']);
-                }
-
-                if (class_exists(HttpHeaderSerializer::class) && class_exists(WebLinkExtension::class)) {
                 $twig->addExtension(new WebLinkExtension($app['request_stack']));
             }
-            }
 
             return $twig;
         };
@@ -192,19 +180,10 @@ class TwigServiceProvider implements ServiceProviderInterface
         };
 
         $app['twig.runtimes'] = function ($app) {
-            $runtimes = [];
-
-            if (class_exists(HttpKernelRuntime::class)) {
-                $runtimes[HttpKernelRuntime::class] = 'twig.runtime.httpkernel';
-            }
-
-            if (Kernel::VERSION_ID < 30400) {
-                $runtimes[TwigRenderer::class] = 'twig.form.renderer';
-            } else {
-                $runtimes[FormRenderer::class] = 'twig.form.renderer';
-            }
-
-            return $runtimes;
+            return [
+                HttpKernelRuntime::class => 'twig.runtime.httpkernel',
+                FormRenderer::class => 'twig.form.renderer',
+            ];
         };
 
         $app['twig.runtime_loader'] = function ($app) {

tests/Silex/Tests/Application/MonologTraitTest.php

@@ -17,8 +17,6 @@ use Monolog\Handler\TestHandler;
 use Monolog\Logger;
 
 /**
- * MonologTrait test cases.
- *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class MonologTraitTest extends TestCase

tests/Silex/Tests/Application/SecurityTraitTest.php

@@ -17,8 +17,6 @@ use Symfony\Component\Security\Core\User\User;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
- * SecurityTrait test cases.
- *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class SecurityTraitTest extends TestCase

tests/Silex/Tests/Application/SwiftmailerTraitTest.php

@@ -15,8 +15,6 @@ use PHPUnit\Framework\TestCase;
 use Silex\Provider\SwiftmailerServiceProvider;
 
 /**
- * SwiftmailerTrait test cases.
- *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class SwiftmailerTraitTest extends TestCase

tests/Silex/Tests/Application/TranslationTraitTest.php

@@ -15,8 +15,6 @@ use PHPUnit\Framework\TestCase;
 use Silex\Provider\TranslationServiceProvider;
 
 /**
- * TranslationTrait test cases.
- *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class TranslationTraitTest extends TestCase

tests/Silex/Tests/Application/TwigTraitTest.php

@@ -17,8 +17,6 @@ use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\StreamedResponse;
 
 /**
- * TwigTrait test cases.
- *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class TwigTraitTest extends TestCase

tests/Silex/Tests/ApplicationTest.php

@@ -25,7 +25,6 @@ use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\WebLink\HttpHeaderSerializer;
 
 /**
  * Application test cases.
@@ -661,10 +660,6 @@ class ApplicationTest extends TestCase
 
     public function testWebLinkListener()
     {
-        if (!class_exists(HttpHeaderSerializer::class)) {
-            self::markTestSkipped('Symfony WebLink component is required.');
-        }
-
         $app = new Application();
 
         $app->get('/', function () {

tests/Silex/Tests/ControllerResolverTest.php

-<?php
-
-/*
- * This file is part of the Silex framework.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * This source file is subject to the MIT license that is bundled
- * with this source code in the file LICENSE.
- */
-
-namespace Silex\Tests;
-
-use PHPUnit\Framework\TestCase;
-use Silex\ControllerResolver;
-use Silex\Application;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Kernel;
-
-/**
- * ControllerResolver test cases.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- */
-class ControllerResolverTest extends TestCase
-{
-    /**
-     * @group legacy
-     */
-    public function testGetArguments()
-    {
-        if (Kernel::VERSION_ID >= 30100) {
-            self::markTestSkipped('HttpKernel < 3.1.0 is required');
-        }
-
-        $app = new Application();
-        $resolver = new ControllerResolver($app);
-
-        $controller = function (Application $app) {};
-
-        $args = $resolver->getArguments(Request::create('/'), $controller);
-        $this->assertSame($app, $args[0]);
-    }
-}

tests/Silex/Tests/Provider/AssetServiceProviderTest.php

@@ -36,12 +36,6 @@ class AssetServiceProviderTest extends TestCase
 
     public function testJsonManifestVersionStrategy()
     {
-        if (!class_exists('Symfony\Component\Asset\VersionStrategy\JsonManifestVersionStrategy')) {
-            $this->markTestSkipped('JsonManifestVersionStrategy class is not available.');
-
-            return;
-        }
-
         $app = new Application();
         $app->register(new AssetServiceProvider(), [
             'assets.json_manifest_path' => __DIR__.'/../Fixtures/manifest.json',

tests/Silex/Tests/Provider/FormServiceProviderTest.php

@@ -23,7 +23,6 @@ use Symfony\Component\Form\AbstractTypeExtension;
 use Symfony\Component\Form\FormTypeGuesserChain;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\OptionsResolver\OptionsResolver;
-use Symfony\Component\OptionsResolver\OptionsResolverInterface;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
 
 class FormServiceProviderTest extends TestCase
@@ -313,27 +312,12 @@ class FormServiceProviderTest extends TestCase
     }
 }
 
-if (!class_exists('Symfony\Component\Form\Deprecated\FormEvents')) {
-    class DummyFormType extends AbstractType
-    {
-    }
-} else {
-    // FormTypeInterface::getName() is needed by the form component 2.8.x
-    class DummyFormType extends AbstractType
-    {
-        /**
-         * @return string The name of this type
-         */
-        public function getName()
-        {
-            return 'dummy';
-        }
-    }
+class DummyFormType extends AbstractType
+{
 }
 
-if (method_exists('Symfony\Component\Form\AbstractType', 'configureOptions')) {
-    class DummyFormTypeExtension extends AbstractTypeExtension
-    {
+class DummyFormTypeExtension extends AbstractTypeExtension
+{
     public function getExtendedType()
     {
         return 'Symfony\Component\Form\Extension\Core\Type\FileType';
@@ -343,22 +327,4 @@ if (method_exists('Symfony\Component\Form\AbstractType', 'configureOptions')) {
     {
         $resolver->setDefined(['image_path']);
     }
-    }
-} else {
-    class DummyFormTypeExtension extends AbstractTypeExtension
-    {
-        public function getExtendedType()
-        {
-            return 'Symfony\Component\Form\Extension\Core\Type\FileType';
-        }
-
-        public function setDefaultOptions(OptionsResolverInterface $resolver)
-        {
-            if (!method_exists($resolver, 'setDefined')) {
-                $resolver->setOptional(['image_path']);
-            } else {
-                $resolver->setDefined(['image_path']);
-            }
-        }
-    }
 }

tests/Silex/Tests/Provider/MonologServiceProviderTest.php

@@ -11,16 +11,15 @@
 
 namespace Silex\Tests\Provider;
 
+use PHPUnit\Framework\TestCase;
 use Monolog\Formatter\JsonFormatter;
 use Monolog\Handler\TestHandler;
 use Monolog\Logger;
-use PHPUnit\Framework\TestCase;
 use Silex\Application;
 use Silex\Provider\MonologServiceProvider;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\HttpKernel\Kernel;
 
 /**
  * MonologProvider test cases.
@@ -59,13 +58,9 @@ class MonologServiceProviderTest extends TestCase
         $this->assertTrue($app['monolog.handler']->hasDebug('< 200'));
 
         $records = $app['monolog.handler']->getRecords();
-        if (Kernel::VERSION_ID < 30100) {
-            $this->assertContains('Matched route "GET_foo"', $records[0]['message']);
-        } else {
         $this->assertContains('Matched route "{route}".', $records[0]['message']);
         $this->assertSame('GET_foo', $records[0]['context']['route']);
     }
-    }
 
     public function testManualLogging()
     {

tests/Silex/Tests/Provider/SecurityServiceProviderTest/TokenAuthenticator.php

@@ -13,7 +13,6 @@ namespace Silex\Tests\Provider\SecurityServiceProviderTest;
 
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\JsonResponse;
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Guard\AbstractGuardAuthenticator;
@@ -28,7 +27,7 @@ class TokenAuthenticator extends AbstractGuardAuthenticator
     public function getCredentials(Request $request)
     {
         if (!$token = $request->headers->get('X-AUTH-TOKEN')) {
-            return Kernel::VERSION_ID < 30400 ? null : false;
+            return false;
         }
 
         list($username, $secret) = explode(':', $token);

tests/Silex/Tests/Provider/TwigServiceProviderTest.php

@@ -18,10 +18,7 @@ use Silex\Provider\CsrfServiceProvider;
 use Silex\Provider\FormServiceProvider;
 use Silex\Provider\TwigServiceProvider;
 use Silex\Provider\AssetServiceProvider;
-use Symfony\Bridge\Twig\Extension\WebLinkExtension;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Component\WebLink\HttpHeaderSerializer;
 
 /**
  * TwigProvider test cases.
@@ -112,12 +109,8 @@ class TwigServiceProviderTest extends TestCase
 
         $this->assertInstanceOf('Twig_Environment', $app['twig']);
         $this->assertInstanceOf('Symfony\Bridge\Twig\Form\TwigRendererEngine', $app['twig.form.engine']);
-        if (Kernel::VERSION_ID < 30400) {
-            $this->assertInstanceOf('Symfony\Bridge\Twig\Form\TwigRenderer', $app['twig.form.renderer']);
-        } else {
         $this->assertInstanceOf('Symfony\Component\Form\FormRenderer', $app['twig.form.renderer']);
     }
-    }
 
     public function testFormWithoutCsrf()
     {
@@ -152,10 +145,6 @@ class TwigServiceProviderTest extends TestCase
 
     public function testWebLinkIntegration()
     {
-        if (!class_exists(HttpHeaderSerializer::class) || !class_exists(WebLinkExtension::class)) {
-            $this->markTestSkipped('Twig WebLink extension not available.');
-        }
-
         $app = new Application();
         $app['request_stack']->push($request = Request::create('/'));
         $app->register(new TwigServiceProvider(), [

tests/Silex/Tests/Provider/ValidatorServiceProviderTest.php

@@ -20,7 +20,6 @@ use Symfony\Component\Translation\Exception\NotFoundResourceException;
 use Symfony\Component\Validator\Constraints as Assert;
 use Silex\Tests\Provider\ValidatorServiceProviderTest\Constraint\Custom;
 use Silex\Tests\Provider\ValidatorServiceProviderTest\Constraint\CustomValidator;
-use Symfony\Component\Validator\ValidatorInterface as LegacyValidatorInterface;
 use Symfony\Component\Validator\Validator\ValidatorInterface;
 
 /**
@@ -36,8 +35,6 @@ class ValidatorServiceProviderTest extends TestCase
         $app->register(new ValidatorServiceProvider());
         $app->register(new FormServiceProvider());
 
-        $this->assertInstanceOf('Symfony\Component\Validator\Validator\ValidatorInterface', $app['validator']);
-
         return $app;
     }
 
@@ -55,8 +52,6 @@ class ValidatorServiceProviderTest extends TestCase
             ],
         ]);
 
-        $this->assertInstanceOf('Symfony\Component\Validator\Validator\ValidatorInterface', $app['validator']);
-
         return $app;
     }
 
@@ -86,7 +81,7 @@ class ValidatorServiceProviderTest extends TestCase
      */
     public function testValidatorServiceIsAValidator($app)
     {
-        $this->assertTrue($app['validator'] instanceof ValidatorInterface || $app['validator'] instanceof LegacyValidatorInterface);
+        $this->assertTrue($app['validator'] instanceof ValidatorInterface);
     }
 
     /**

tests/Silex/Tests/ServiceControllerResolverTest.php

@@ -15,7 +15,6 @@ use PHPUnit\Framework\TestCase;
 use Silex\ServiceControllerResolver;
 use Silex\Application;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Kernel;
 
 /**
  * Unit tests for ServiceControllerResolver, see ServiceControllerResolverRouterTest for some
@@ -77,22 +76,4 @@ class ServiceControllerResolverTest extends Testcase
 
         $this->assertEquals(123, $this->resolver->getController($req));
     }
-
-    /**
-     * @group legacy
-     */
-    public function testShouldDelegateGetArguments()
-    {
-        if (Kernel::VERSION_ID >= 40000) {
-            self::markTestSkipped('HttpKernel < 4.0 is required');
-        }
-
-        $req = Request::create('/');
-        $this->mockResolver->expects($this->once())
-            ->method('getArguments')
-            ->with($req)
-            ->will($this->returnValue(123));
-
-        $this->assertEquals(123, $this->resolver->getArguments($req, function () {}));
-    }
 }