diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 7991ae8923e..a0b32618ab7 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -2,7 +2,6 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
          bootstrap="vendor/autoload.php">
     <testsuites>
diff --git a/src/Sylius/Bundle/AddressingBundle/composer.json b/src/Sylius/Bundle/AddressingBundle/composer.json
index 3de5414695c..8a6252ae3c5 100644
--- a/src/Sylius/Bundle/AddressingBundle/composer.json
+++ b/src/Sylius/Bundle/AddressingBundle/composer.json
@@ -48,9 +48,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\AddressingBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\AddressingBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/AddressingBundle/phpunit.xml.dist b/src/Sylius/Bundle/AddressingBundle/phpunit.xml.dist
index 0c17969de42..6f8a895e79d 100644
--- a/src/Sylius/Bundle/AddressingBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/AddressingBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusAddressingBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/AddressingBundle/test/app/autoload.php b/src/Sylius/Bundle/AddressingBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/AddressingBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/AddressingBundle/test/src/Tests/SyliusAddressingBundleTest.php b/src/Sylius/Bundle/AddressingBundle/test/src/Tests/SyliusAddressingBundleTest.php
index 0163123a49c..7f488a954bb 100644
--- a/src/Sylius/Bundle/AddressingBundle/test/src/Tests/SyliusAddressingBundleTest.php
+++ b/src/Sylius/Bundle/AddressingBundle/test/src/Tests/SyliusAddressingBundleTest.php
@@ -13,10 +13,12 @@
 
 namespace Sylius\Bundle\AddressingBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusAddressingBundleTest extends WebTestCase
+final class SyliusAddressingBundleTest extends WebTestCase
 {
     /**
      * @test
@@ -33,7 +35,7 @@ public function its_services_are_initializable(): void
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/AdminBundle/composer.json b/src/Sylius/Bundle/AdminBundle/composer.json
index 0ba8b13fab3..1b8fad21b8c 100644
--- a/src/Sylius/Bundle/AdminBundle/composer.json
+++ b/src/Sylius/Bundle/AdminBundle/composer.json
@@ -28,8 +28,8 @@
         "symfony/framework-bundle": "^3.4|^4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.5",
         "phpspec/phpspec": "^4.0",
+        "phpunit/phpunit": "^6.5",
         "symfony/dependency-injection": "^3.4|^4.0"
     },
     "conflict": {
diff --git a/src/Sylius/Bundle/AdminBundle/phpunit.xml.dist b/src/Sylius/Bundle/AdminBundle/phpunit.xml.dist
index 4a103a2f8fb..8e948485a42 100644
--- a/src/Sylius/Bundle/AdminBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/AdminBundle/phpunit.xml.dist
@@ -1,15 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <testsuites>
         <testsuite name="SyliusAdminBundle Test Suite">
-            <directory>./Tests</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
 </phpunit>
diff --git a/src/Sylius/Bundle/AttributeBundle/composer.json b/src/Sylius/Bundle/AttributeBundle/composer.json
index 809bc068bd9..f5e6886a8c2 100644
--- a/src/Sylius/Bundle/AttributeBundle/composer.json
+++ b/src/Sylius/Bundle/AttributeBundle/composer.json
@@ -46,9 +46,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\AttributeBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\AttributeBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/AttributeBundle/phpunit.xml.dist b/src/Sylius/Bundle/AttributeBundle/phpunit.xml.dist
index 3d5316df076..515f1ccf8f7 100644
--- a/src/Sylius/Bundle/AttributeBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/AttributeBundle/phpunit.xml.dist
@@ -2,17 +2,16 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusAttributeBundle Test Suite">
             <directory>./test/</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
 </phpunit>
diff --git a/src/Sylius/Bundle/AttributeBundle/test/app/autoload.php b/src/Sylius/Bundle/AttributeBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/AttributeBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/AttributeBundle/test/src/Tests/SyliusAttributeBundleTest.php b/src/Sylius/Bundle/AttributeBundle/test/src/Tests/SyliusAttributeBundleTest.php
index 8a2a0a4d106..66079bb6ea5 100644
--- a/src/Sylius/Bundle/AttributeBundle/test/src/Tests/SyliusAttributeBundleTest.php
+++ b/src/Sylius/Bundle/AttributeBundle/test/src/Tests/SyliusAttributeBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\AttributeBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusAttributeBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusAttributeBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/ChannelBundle/composer.json b/src/Sylius/Bundle/ChannelBundle/composer.json
index 44f2ceef3bf..1c42ca404a6 100644
--- a/src/Sylius/Bundle/ChannelBundle/composer.json
+++ b/src/Sylius/Bundle/ChannelBundle/composer.json
@@ -45,9 +45,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\ChannelBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\ChannelBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/ChannelBundle/phpunit.xml.dist b/src/Sylius/Bundle/ChannelBundle/phpunit.xml.dist
index c1a3d694408..596a077a0e7 100644
--- a/src/Sylius/Bundle/ChannelBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/ChannelBundle/phpunit.xml.dist
@@ -1,32 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
 
     <testsuites>
-        <testsuite name="Sylius Test Suite">
-            <directory>Tests</directory>
-        </testsuite>
-
-        <testsuite name="SyliusAttributeBundle Test Suite">
+        <testsuite name="SyliusChannelBundle Test Suite">
             <directory>./test/</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <exclude>
-                <directory>Resources</directory>
-                <directory>Tests</directory>
-            </exclude>
-        </whitelist>
-    </filter>
 </phpunit>
diff --git a/src/Sylius/Bundle/ChannelBundle/test/app/autoload.php b/src/Sylius/Bundle/ChannelBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/ChannelBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/ChannelBundle/test/src/Tests/SyliusChannelBundleTest.php b/src/Sylius/Bundle/ChannelBundle/test/src/Tests/SyliusChannelBundleTest.php
index 4e3a18f7449..9a010432943 100644
--- a/src/Sylius/Bundle/ChannelBundle/test/src/Tests/SyliusChannelBundleTest.php
+++ b/src/Sylius/Bundle/ChannelBundle/test/src/Tests/SyliusChannelBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\ChannelBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusChannelBundleTest extends WebTestCase
+final class SyliusChannelBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_initializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/CoreBundle/Tests/Application/SyliusPluginTraitTest.php b/src/Sylius/Bundle/CoreBundle/Tests/Application/SyliusPluginTraitTest.php
index 4c26bf6dee1..3157a6b9a58 100644
--- a/src/Sylius/Bundle/CoreBundle/Tests/Application/SyliusPluginTraitTest.php
+++ b/src/Sylius/Bundle/CoreBundle/Tests/Application/SyliusPluginTraitTest.php
@@ -13,6 +13,7 @@
 
 namespace Sylius\Bundle\CoreBundle\Tests\Application;
 
+use PHPUnit\Framework\Assert;
 use PHPUnit\Framework\TestCase;
 use Sylius\Bundle\CoreBundle\Application\SyliusPluginTrait;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
@@ -24,8 +25,10 @@ final class SyliusPluginTraitTest extends TestCase
      */
     public function it_does_not_crash(): void
     {
-        new class() extends Bundle {
+        $class = new class() extends Bundle {
             use SyliusPluginTrait;
         };
+
+        Assert::assertNotNull($class);
     }
 }
diff --git a/src/Sylius/Bundle/CoreBundle/phpunit.xml.dist b/src/Sylius/Bundle/CoreBundle/phpunit.xml.dist
index cb8d986d0d2..1167b623b89 100644
--- a/src/Sylius/Bundle/CoreBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/CoreBundle/phpunit.xml.dist
@@ -3,19 +3,11 @@
 <!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <testsuites>
         <testsuite name="Sylius Test Suite">
             <directory>./Tests</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>./Tests</directory>
-        </whitelist>
-    </filter>
 </phpunit>
diff --git a/src/Sylius/Bundle/CurrencyBundle/composer.json b/src/Sylius/Bundle/CurrencyBundle/composer.json
index 75d45c2202a..6fef680a263 100644
--- a/src/Sylius/Bundle/CurrencyBundle/composer.json
+++ b/src/Sylius/Bundle/CurrencyBundle/composer.json
@@ -48,9 +48,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\CurrencyBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\CurrencyBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/CurrencyBundle/phpunit.xml.dist b/src/Sylius/Bundle/CurrencyBundle/phpunit.xml.dist
index e31a21bbcac..ee9a3ec3541 100644
--- a/src/Sylius/Bundle/CurrencyBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/CurrencyBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusCurrencyBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/CurrencyBundle/test/app/autoload.php b/src/Sylius/Bundle/CurrencyBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/CurrencyBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/CurrencyBundle/test/src/Tests/SyliusCurrencyBundleTest.php b/src/Sylius/Bundle/CurrencyBundle/test/src/Tests/SyliusCurrencyBundleTest.php
index fdd57361de6..d0a08792fec 100644
--- a/src/Sylius/Bundle/CurrencyBundle/test/src/Tests/SyliusCurrencyBundleTest.php
+++ b/src/Sylius/Bundle/CurrencyBundle/test/src/Tests/SyliusCurrencyBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\CurrencyBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusCurrencyBundleTest extends WebTestCase
+final class SyliusCurrencyBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_initializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/CustomerBundle/composer.json b/src/Sylius/Bundle/CustomerBundle/composer.json
index 689a93611bb..87bbf623479 100644
--- a/src/Sylius/Bundle/CustomerBundle/composer.json
+++ b/src/Sylius/Bundle/CustomerBundle/composer.json
@@ -56,9 +56,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\CustomerBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\CustomerBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/CustomerBundle/phpunit.xml.dist b/src/Sylius/Bundle/CustomerBundle/phpunit.xml.dist
index 0beec81acd2..b88be054af5 100644
--- a/src/Sylius/Bundle/CustomerBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/CustomerBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusCustomerBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/CustomerBundle/test/app/autoload.php b/src/Sylius/Bundle/CustomerBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/CustomerBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/CustomerBundle/test/src/Tests/SyliusCustomerBundleTest.php b/src/Sylius/Bundle/CustomerBundle/test/src/Tests/SyliusCustomerBundleTest.php
index b6a1e691ae6..47d6f16c1cb 100644
--- a/src/Sylius/Bundle/CustomerBundle/test/src/Tests/SyliusCustomerBundleTest.php
+++ b/src/Sylius/Bundle/CustomerBundle/test/src/Tests/SyliusCustomerBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\CustomerBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusCustomerBundleTest extends WebTestCase
+final class SyliusCustomerBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_initializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/FixturesBundle/composer.json b/src/Sylius/Bundle/FixturesBundle/composer.json
index 2755e5d1e9c..d9b26c436db 100644
--- a/src/Sylius/Bundle/FixturesBundle/composer.json
+++ b/src/Sylius/Bundle/FixturesBundle/composer.json
@@ -53,9 +53,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\FixturesBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\FixturesBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/FixturesBundle/humbug.json.dist b/src/Sylius/Bundle/FixturesBundle/humbug.json.dist
deleted file mode 100644
index 353452a0637..00000000000
--- a/src/Sylius/Bundle/FixturesBundle/humbug.json.dist
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-    "source": {
-        "directories": [
-            "."
-        ],
-        "excludes": [
-            "bin",
-            "spec",
-            "Tests",
-            "vendor"
-        ]
-    },
-    "timeout": 2,
-    "logs": {
-        "text": "humbuglog.txt"
-    }
-}
diff --git a/src/Sylius/Bundle/FixturesBundle/phpunit.xml.dist b/src/Sylius/Bundle/FixturesBundle/phpunit.xml.dist
index 5ad84c71a85..809783fc9a5 100644
--- a/src/Sylius/Bundle/FixturesBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/FixturesBundle/phpunit.xml.dist
@@ -1,30 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
 
     <testsuites>
-        <testsuite name="Sylius Test Suite">
-            <directory>./Tests</directory>
-        </testsuite>
-
         <testsuite name="SyliusFixturesBundle Test Suite">
             <directory>./test/</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>./Tests</directory>
-        </whitelist>
-    </filter>
 </phpunit>
diff --git a/src/Sylius/Bundle/FixturesBundle/test/app/autoload.php b/src/Sylius/Bundle/FixturesBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/FixturesBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/FixturesBundle/test/src/Tests/SyliusFixturesBundleTest.php b/src/Sylius/Bundle/FixturesBundle/test/src/Tests/SyliusFixturesBundleTest.php
index e3f0a396509..9a68fdcc9bf 100644
--- a/src/Sylius/Bundle/FixturesBundle/test/src/Tests/SyliusFixturesBundleTest.php
+++ b/src/Sylius/Bundle/FixturesBundle/test/src/Tests/SyliusFixturesBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\FixturesBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusFixturesBundleTest extends WebTestCase
+final class SyliusFixturesBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_initializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/GridBundle/composer.json b/src/Sylius/Bundle/GridBundle/composer.json
index ea130420154..3809507fbfe 100644
--- a/src/Sylius/Bundle/GridBundle/composer.json
+++ b/src/Sylius/Bundle/GridBundle/composer.json
@@ -59,9 +59,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\GridBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\GridBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/GridBundle/phpunit.xml.dist b/src/Sylius/Bundle/GridBundle/phpunit.xml.dist
index e4e8acba8ab..66c7f0b297c 100644
--- a/src/Sylius/Bundle/GridBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/GridBundle/phpunit.xml.dist
@@ -1,29 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
-         bootstrap="vendor/autoload.php"
          colors="true"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
-        <testsuite name="SyliusAddressingBundle Test Suite">
+        <testsuite name="SyliusGridBundle Test Suite">
             <directory>./test/</directory>
-        </testsuite>
-
-        <testsuite name="Sylius Test Suite">
-            <directory>./Tests</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>./Tests</directory>
-        </whitelist>
-    </filter>
 </phpunit>
diff --git a/src/Sylius/Bundle/GridBundle/test/app/autoload.php b/src/Sylius/Bundle/GridBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/GridBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/GridBundle/test/src/Tests/SyliusGridBundleTest.php b/src/Sylius/Bundle/GridBundle/test/src/Tests/SyliusGridBundleTest.php
index 2185b096503..200a56c6197 100644
--- a/src/Sylius/Bundle/GridBundle/test/src/Tests/SyliusGridBundleTest.php
+++ b/src/Sylius/Bundle/GridBundle/test/src/Tests/SyliusGridBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\GridBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusGridBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusGridBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/InventoryBundle/composer.json b/src/Sylius/Bundle/InventoryBundle/composer.json
index 94a80964e03..fcc347200cd 100644
--- a/src/Sylius/Bundle/InventoryBundle/composer.json
+++ b/src/Sylius/Bundle/InventoryBundle/composer.json
@@ -48,9 +48,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\InventoryBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\InventoryBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/InventoryBundle/phpunit.xml.dist b/src/Sylius/Bundle/InventoryBundle/phpunit.xml.dist
index 53e3bda378a..1d03cd8dbd1 100644
--- a/src/Sylius/Bundle/InventoryBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/InventoryBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusInventoryBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/InventoryBundle/test/app/autoload.php b/src/Sylius/Bundle/InventoryBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/InventoryBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/InventoryBundle/test/src/Tests/SyliusInventoryBundleTest.php b/src/Sylius/Bundle/InventoryBundle/test/src/Tests/SyliusInventoryBundleTest.php
index 3e4bb3939b8..614afee8d64 100644
--- a/src/Sylius/Bundle/InventoryBundle/test/src/Tests/SyliusInventoryBundleTest.php
+++ b/src/Sylius/Bundle/InventoryBundle/test/src/Tests/SyliusInventoryBundleTest.php
@@ -11,9 +11,11 @@
 
 declare(strict_types=1);
 
-namespace Sylius\Bundle\AddressingBundle\Tests;
+namespace Sylius\Bundle\InventoryBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusInventoryBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusInventoryBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/LocaleBundle/composer.json b/src/Sylius/Bundle/LocaleBundle/composer.json
index ba7b22b19c5..a065494aa6c 100644
--- a/src/Sylius/Bundle/LocaleBundle/composer.json
+++ b/src/Sylius/Bundle/LocaleBundle/composer.json
@@ -48,9 +48,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\LocaleBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\LocaleBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/LocaleBundle/phpunit.xml.dist b/src/Sylius/Bundle/LocaleBundle/phpunit.xml.dist
index d49e2f58a9c..05423274e62 100644
--- a/src/Sylius/Bundle/LocaleBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/LocaleBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusLocaleBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/LocaleBundle/test/app/autoload.php b/src/Sylius/Bundle/LocaleBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/LocaleBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/LocaleBundle/test/src/Tests/SyliusLocaleBundleTest.php b/src/Sylius/Bundle/LocaleBundle/test/src/Tests/SyliusLocaleBundleTest.php
index ea74cc1f293..32d018fcd73 100644
--- a/src/Sylius/Bundle/LocaleBundle/test/src/Tests/SyliusLocaleBundleTest.php
+++ b/src/Sylius/Bundle/LocaleBundle/test/src/Tests/SyliusLocaleBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\LocaleBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusLocaleBundleTest extends WebTestCase
+final class SyliusLocaleBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_initializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/MailerBundle/composer.json b/src/Sylius/Bundle/MailerBundle/composer.json
index 0cee42d7e8a..711ab75a8dc 100644
--- a/src/Sylius/Bundle/MailerBundle/composer.json
+++ b/src/Sylius/Bundle/MailerBundle/composer.json
@@ -43,9 +43,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\MailerBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\MailerBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/MailerBundle/phpunit.xml.dist b/src/Sylius/Bundle/MailerBundle/phpunit.xml.dist
index bd8af90d516..e41de44205f 100644
--- a/src/Sylius/Bundle/MailerBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/MailerBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusMailerBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/MailerBundle/test/src/Tests/SyliusMailerBundleTest.php b/src/Sylius/Bundle/MailerBundle/test/src/Tests/SyliusMailerBundleTest.php
index 0dac63ceb8b..94f629513bc 100644
--- a/src/Sylius/Bundle/MailerBundle/test/src/Tests/SyliusMailerBundleTest.php
+++ b/src/Sylius/Bundle/MailerBundle/test/src/Tests/SyliusMailerBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\MailerBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusMailerBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusMailerBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/MoneyBundle/composer.json b/src/Sylius/Bundle/MoneyBundle/composer.json
index 97c104bf26f..0a245f83611 100644
--- a/src/Sylius/Bundle/MoneyBundle/composer.json
+++ b/src/Sylius/Bundle/MoneyBundle/composer.json
@@ -50,9 +50,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\MoneyBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\MoneyBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/MoneyBundle/phpunit.xml.dist b/src/Sylius/Bundle/MoneyBundle/phpunit.xml.dist
index 37664ba4154..3db715fe7b8 100644
--- a/src/Sylius/Bundle/MoneyBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/MoneyBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusMoneyBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/MoneyBundle/test/app/autoload.php b/src/Sylius/Bundle/MoneyBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/MoneyBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/MoneyBundle/test/src/Tests/SyliusMoneyBundleTest.php b/src/Sylius/Bundle/MoneyBundle/test/src/Tests/SyliusMoneyBundleTest.php
index ffbe4f34023..b6ab70edabc 100644
--- a/src/Sylius/Bundle/MoneyBundle/test/src/Tests/SyliusMoneyBundleTest.php
+++ b/src/Sylius/Bundle/MoneyBundle/test/src/Tests/SyliusMoneyBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\MoneyBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusMoneyBundleTest extends WebTestCase
+final class SyliusMoneyBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_intitializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
-            return false !== strpos($serviceId, 'sylius');
+        $services = array_filter($services, function (string $serviceId): bool {
+            return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/OrderBundle/Tests/DependencyInjection/Compiler/RegisterOrderProcessorPassTest.php b/src/Sylius/Bundle/OrderBundle/Tests/DependencyInjection/Compiler/RegisterOrderProcessorPassTest.php
index 3ecdcbe477d..1247aa80495 100644
--- a/src/Sylius/Bundle/OrderBundle/Tests/DependencyInjection/Compiler/RegisterOrderProcessorPassTest.php
+++ b/src/Sylius/Bundle/OrderBundle/Tests/DependencyInjection/Compiler/RegisterOrderProcessorPassTest.php
@@ -31,7 +31,7 @@ final class RegisterOrderProcessorPassTest extends AbstractCompilerPassTestCase
     public function it_adds_method_call_to_composite_order_processor_if_exist(): void
     {
         $compositeOrderProcessorDefinition = new Definition(CompositeOrderProcessor::class);
-        $this->setDefinition('sylius.order_processing.order_processor', $compositeOrderProcessorDefinition);
+        $this->setDefinition('sylius.order_processing.order_processor.composite', $compositeOrderProcessorDefinition);
 
         $orderAdjustmentClearerDefinition = new Definition(OrderAdjustmentsClearer::class);
         $orderAdjustmentClearerDefinition->addTag('sylius.order_processor');
@@ -55,7 +55,7 @@ public function it_adds_method_call_to_composite_order_processor_if_exist(): voi
     public function it_adds_method_call_to_composite_order_processor_with_custom_priority(): void
     {
         $compositeOrderProcessorDefinition = new Definition(CompositeOrderProcessor::class);
-        $this->setDefinition('sylius.order_processing.order_processor', $compositeOrderProcessorDefinition);
+        $this->setDefinition('sylius.order_processing.order_processor.composite', $compositeOrderProcessorDefinition);
 
         $orderAdjustmentClearerDefinition = new Definition(OrderAdjustmentsClearer::class);
         $orderAdjustmentClearerDefinition->addTag('sylius.order_processor', ['priority' => 10]);
diff --git a/src/Sylius/Bundle/OrderBundle/composer.json b/src/Sylius/Bundle/OrderBundle/composer.json
index 7764e6e8d51..2341673b332 100644
--- a/src/Sylius/Bundle/OrderBundle/composer.json
+++ b/src/Sylius/Bundle/OrderBundle/composer.json
@@ -31,13 +31,14 @@
     },
     "require-dev": {
         "doctrine/orm": "^2.5",
+        "matthiasnoback/symfony-dependency-injection-test": "^2.0",
         "phpspec/phpspec": "^4.0",
         "phpunit/phpunit": "^6.5",
+        "polishsymfonycommunity/symfony-mocker-container": "^1.0",
         "symfony/browser-kit": "^3.4|^4.0",
         "symfony/dependency-injection": "^3.4|^4.0",
         "symfony/form": "^3.4|^4.0",
-        "symfony/validator": "^3.4|^4.0",
-        "polishsymfonycommunity/symfony-mocker-container": "^1.0"
+        "symfony/validator": "^3.4|^4.0"
     },
     "conflict": {
         "twig/twig": "^1.0"
@@ -50,9 +51,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\OrderBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\OrderBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/OrderBundle/phpunit.xml.dist b/src/Sylius/Bundle/OrderBundle/phpunit.xml.dist
index 73cc516eea4..e85f9862b56 100644
--- a/src/Sylius/Bundle/OrderBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/OrderBundle/phpunit.xml.dist
@@ -2,17 +2,16 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusOrderBundle Test Suite">
             <directory>./test/</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
 </phpunit>
diff --git a/src/Sylius/Bundle/OrderBundle/test/app/autoload.php b/src/Sylius/Bundle/OrderBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/OrderBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/OrderBundle/test/src/Tests/SyliusOrderBundleTest.php b/src/Sylius/Bundle/OrderBundle/test/src/Tests/SyliusOrderBundleTest.php
index d31bd587379..eed719a5695 100644
--- a/src/Sylius/Bundle/OrderBundle/test/src/Tests/SyliusOrderBundleTest.php
+++ b/src/Sylius/Bundle/OrderBundle/test/src/Tests/SyliusOrderBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\OrderBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusOrderBundleTest extends WebTestCase
+final class SyliusOrderBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_initializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/PaymentBundle/composer.json b/src/Sylius/Bundle/PaymentBundle/composer.json
index 9de13036a90..29958b9c261 100644
--- a/src/Sylius/Bundle/PaymentBundle/composer.json
+++ b/src/Sylius/Bundle/PaymentBundle/composer.json
@@ -43,9 +43,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\PaymentBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\PaymentBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/PaymentBundle/phpunit.xml.dist b/src/Sylius/Bundle/PaymentBundle/phpunit.xml.dist
index db2cee1ff77..06bdb3e9dcb 100644
--- a/src/Sylius/Bundle/PaymentBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/PaymentBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusPaymentBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/PaymentBundle/test/app/autoload.php b/src/Sylius/Bundle/PaymentBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/PaymentBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/PaymentBundle/test/app/db.sql b/src/Sylius/Bundle/PaymentBundle/test/app/db.sql
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/src/Sylius/Bundle/PaymentBundle/test/src/Tests/SyliusPaymentBundleTest.php b/src/Sylius/Bundle/PaymentBundle/test/src/Tests/SyliusPaymentBundleTest.php
index edfb3361e2c..378a194d7c6 100644
--- a/src/Sylius/Bundle/PaymentBundle/test/src/Tests/SyliusPaymentBundleTest.php
+++ b/src/Sylius/Bundle/PaymentBundle/test/src/Tests/SyliusPaymentBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\PaymentBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusPaymentBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusPaymentBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/ProductBundle/composer.json b/src/Sylius/Bundle/ProductBundle/composer.json
index b12d3e78de5..4edab47de5f 100644
--- a/src/Sylius/Bundle/ProductBundle/composer.json
+++ b/src/Sylius/Bundle/ProductBundle/composer.json
@@ -47,9 +47,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\ProductBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\ProductBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/ProductBundle/phpunit.xml.dist b/src/Sylius/Bundle/ProductBundle/phpunit.xml.dist
index 62e1812181f..72bc08b324b 100644
--- a/src/Sylius/Bundle/ProductBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/ProductBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusProductBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/ProductBundle/test/app/autoload.php b/src/Sylius/Bundle/ProductBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/ProductBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/ProductBundle/test/src/Tests/SyliusProductBundleTest.php b/src/Sylius/Bundle/ProductBundle/test/src/Tests/SyliusProductBundleTest.php
index 9f51c507b85..7dba6d4c686 100644
--- a/src/Sylius/Bundle/ProductBundle/test/src/Tests/SyliusProductBundleTest.php
+++ b/src/Sylius/Bundle/ProductBundle/test/src/Tests/SyliusProductBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\ProductBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusProductBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusProductBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/PromotionBundle/composer.json b/src/Sylius/Bundle/PromotionBundle/composer.json
index b2893d7c772..5e15479bc2d 100644
--- a/src/Sylius/Bundle/PromotionBundle/composer.json
+++ b/src/Sylius/Bundle/PromotionBundle/composer.json
@@ -50,7 +50,8 @@
         "psr-4": {
             "Sylius\\Bundle\\PromotionBundle\\spec\\": "spec/",
             "AppBundle\\": "test/src/AppBundle/"
-        }
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/PromotionBundle/phpunit.xml.dist b/src/Sylius/Bundle/PromotionBundle/phpunit.xml.dist
index 3865b763a4f..6d88d6faeff 100644
--- a/src/Sylius/Bundle/PromotionBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/PromotionBundle/phpunit.xml.dist
@@ -1,28 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
-        <testsuite name="Sylius Test Suite">
-            <directory>./Tests</directory>
-        </testsuite>
         <testsuite name="SyliusPromotionBundle Test Suite">
             <directory>./test/</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>./Tests</directory>
-        </whitelist>
-    </filter>
 </phpunit>
diff --git a/src/Sylius/Bundle/PromotionBundle/test/app/autoload.php b/src/Sylius/Bundle/PromotionBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/PromotionBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/PromotionBundle/test/src/Tests/SyliusPromotionBundleTest.php b/src/Sylius/Bundle/PromotionBundle/test/src/Tests/SyliusPromotionBundleTest.php
index 0826e801bd8..34b5f339b26 100644
--- a/src/Sylius/Bundle/PromotionBundle/test/src/Tests/SyliusPromotionBundleTest.php
+++ b/src/Sylius/Bundle/PromotionBundle/test/src/Tests/SyliusPromotionBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\PromotionBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusPromotionBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusPromotionBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/ResourceBundle/DependencyInjection/Compiler/PrioritizedCompositeServicePass.php b/src/Sylius/Bundle/ResourceBundle/DependencyInjection/Compiler/PrioritizedCompositeServicePass.php
index 8ac2dafe4fd..b03392b7d99 100644
--- a/src/Sylius/Bundle/ResourceBundle/DependencyInjection/Compiler/PrioritizedCompositeServicePass.php
+++ b/src/Sylius/Bundle/ResourceBundle/DependencyInjection/Compiler/PrioritizedCompositeServicePass.php
@@ -59,7 +59,7 @@ public function __construct(string $serviceId, string $compositeId, string $tagN
      */
     public function process(ContainerBuilder $container): void
     {
-        if (!$container->hasDefinition($this->compositeId)) {
+        if (!$container->has($this->compositeId)) {
             return;
         }
 
@@ -111,12 +111,6 @@ private function addMethodCalls(Definition $contextDefinition, string $id, array
      */
     private function addMethodCall(Definition $contextDefinition, string $id, array $attributes): void
     {
-        $arguments = [new Reference($id)];
-
-        if (isset($attributes['priority'])) {
-            $arguments[] = $attributes['priority'];
-        }
-
-        $contextDefinition->addMethodCall($this->methodName, $arguments);
+        $contextDefinition->addMethodCall($this->methodName, [new Reference($id), $attributes['priority'] ?? 0]);
     }
 }
diff --git a/src/Sylius/Bundle/ResourceBundle/composer.json b/src/Sylius/Bundle/ResourceBundle/composer.json
index 30975138840..6126538ec68 100644
--- a/src/Sylius/Bundle/ResourceBundle/composer.json
+++ b/src/Sylius/Bundle/ResourceBundle/composer.json
@@ -70,7 +70,8 @@
         "psr-4": {
             "Sylius\\Bundle\\ResourceBundle\\spec\\": "spec/",
             "AppBundle\\": "test/src/AppBundle/"
-        }
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/ResourceBundle/phpunit.xml.dist b/src/Sylius/Bundle/ResourceBundle/phpunit.xml.dist
index 533f8c4c59c..2e672ad695c 100644
--- a/src/Sylius/Bundle/ResourceBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/ResourceBundle/phpunit.xml.dist
@@ -2,14 +2,13 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
         <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusResourceBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/ResourceBundle/test/app/autoload.php b/src/Sylius/Bundle/ResourceBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/ResourceBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/ResourceBundle/test/src/Tests/SyliusResourceBundleTest.php b/src/Sylius/Bundle/ResourceBundle/test/src/Tests/SyliusResourceBundleTest.php
index fc245ad4835..b88fe6424c4 100644
--- a/src/Sylius/Bundle/ResourceBundle/test/src/Tests/SyliusResourceBundleTest.php
+++ b/src/Sylius/Bundle/ResourceBundle/test/src/Tests/SyliusResourceBundleTest.php
@@ -13,27 +13,29 @@
 
 namespace Sylius\Bundle\ResourceBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
-class SyliusResourceBundleTest extends WebTestCase
+final class SyliusResourceBundleTest extends WebTestCase
 {
     /**
      * @test
      */
-    public function its_services_are_initializable()
+    public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/ReviewBundle/composer.json b/src/Sylius/Bundle/ReviewBundle/composer.json
index a0c90e339f1..095b31b2f55 100644
--- a/src/Sylius/Bundle/ReviewBundle/composer.json
+++ b/src/Sylius/Bundle/ReviewBundle/composer.json
@@ -60,9 +60,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\ReviewBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\ReviewBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/ReviewBundle/phpunit.xml.dist b/src/Sylius/Bundle/ReviewBundle/phpunit.xml.dist
index 04fcea1a846..142315c3e76 100644
--- a/src/Sylius/Bundle/ReviewBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/ReviewBundle/phpunit.xml.dist
@@ -1,19 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusReviewBundle Test Suite">
             <directory>./test/</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
 </phpunit>
diff --git a/src/Sylius/Bundle/ReviewBundle/test/app/autoload.php b/src/Sylius/Bundle/ReviewBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/ReviewBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/ReviewBundle/test/src/Tests/SyliusReviewBundleTest.php b/src/Sylius/Bundle/ReviewBundle/test/src/Tests/SyliusReviewBundleTest.php
index ecc662c5066..9447627b060 100644
--- a/src/Sylius/Bundle/ReviewBundle/test/src/Tests/SyliusReviewBundleTest.php
+++ b/src/Sylius/Bundle/ReviewBundle/test/src/Tests/SyliusReviewBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\ReviewBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusReviewBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusReviewBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/ShippingBundle/composer.json b/src/Sylius/Bundle/ShippingBundle/composer.json
index fe03cc841af..b3d1715b0cb 100644
--- a/src/Sylius/Bundle/ShippingBundle/composer.json
+++ b/src/Sylius/Bundle/ShippingBundle/composer.json
@@ -45,10 +45,7 @@
         "psr-4": { "Sylius\\Bundle\\ShippingBundle\\": "" }
     },
     "autoload-dev": {
-        "psr-4": {
-            "Sylius\\Bundle\\ShippingBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/ShippingBundle/phpunit.xml.dist b/src/Sylius/Bundle/ShippingBundle/phpunit.xml.dist
index efa9305f53c..bb1d52bef8b 100644
--- a/src/Sylius/Bundle/ShippingBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/ShippingBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusShippingBundle Test Suite">
             <directory>./test/</directory>
diff --git a/src/Sylius/Bundle/ShippingBundle/test/app/autoload.php b/src/Sylius/Bundle/ShippingBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/ShippingBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/ShippingBundle/test/src/Tests/SyliusShippingBundleTest.php b/src/Sylius/Bundle/ShippingBundle/test/src/Tests/SyliusShippingBundleTest.php
index 217a7cd7495..2497151967f 100644
--- a/src/Sylius/Bundle/ShippingBundle/test/src/Tests/SyliusShippingBundleTest.php
+++ b/src/Sylius/Bundle/ShippingBundle/test/src/Tests/SyliusShippingBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\ShippingBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusShippingBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusShippingBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/ShopBundle/composer.json b/src/Sylius/Bundle/ShopBundle/composer.json
index 46dc75815ee..92bf42754c6 100644
--- a/src/Sylius/Bundle/ShopBundle/composer.json
+++ b/src/Sylius/Bundle/ShopBundle/composer.json
@@ -2,26 +2,32 @@
     "name": "sylius/shop-bundle",
     "type": "symfony-bundle",
     "description": "Sylius eCommerce storefront.",
-    "keywords": ["shop", "ecommerce", "store", "webshop", "sylius"],
+    "keywords": [
+        "shop",
+        "ecommerce",
+        "store",
+        "webshop",
+        "sylius"
+    ],
     "homepage": "http://sylius.com",
     "license": "MIT",
     "authors": [
         {
-            "name":     "Paweł Jędrzejewski",
+            "name": "Paweł Jędrzejewski",
             "homepage": "http://pjedrzejewski.com"
         },
         {
-            "name":     "Sylius project",
+            "name": "Sylius project",
             "homepage": "http://sylius.com"
         },
         {
-            "name":     "Community contributions",
+            "name": "Community contributions",
             "homepage": "http://github.com/Sylius/Sylius/contributors"
         }
     ],
     "require": {
         "php": "^7.1",
-
+        
         "sonata-project/intl-bundle": "^2.2",
         "sylius/core-bundle": "^1.0",
         "sylius/ui-bundle": "^1.0",
@@ -30,15 +36,17 @@
     "require-dev": {
         "matthiasnoback/symfony-config-test": "^3.0",
         "matthiasnoback/symfony-dependency-injection-test": "^2.0",
-        "phpunit/phpunit": "^6.5",
         "phpspec/phpspec": "^4.0",
+        "phpunit/phpunit": "^6.5",
         "symfony/dependency-injection": "^3.4|^4.0"
     },
     "config": {
         "bin-dir": "bin"
     },
     "autoload": {
-        "psr-4": { "Sylius\\Bundle\\ShopBundle\\": "" }
+        "psr-4": {
+            "Sylius\\Bundle\\ShopBundle\\": ""
+        }
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/ShopBundle/phpunit.xml.dist b/src/Sylius/Bundle/ShopBundle/phpunit.xml.dist
index a16b756eab7..f8b2c84fc84 100644
--- a/src/Sylius/Bundle/ShopBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/ShopBundle/phpunit.xml.dist
@@ -1,15 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
+    <php>
+        <server name="KERNEL_CLASS" value="AppKernel" />
+    </php>
+
     <testsuites>
         <testsuite name="SyliusShopBundle Test Suite">
-            <directory>./Tests</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
 </phpunit>
diff --git a/src/Sylius/Bundle/TaxationBundle/composer.json b/src/Sylius/Bundle/TaxationBundle/composer.json
index d1c18fb5588..dfff1974b83 100644
--- a/src/Sylius/Bundle/TaxationBundle/composer.json
+++ b/src/Sylius/Bundle/TaxationBundle/composer.json
@@ -45,9 +45,9 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Sylius\\Bundle\\TaxationBundle\\spec\\": "spec/",
-            "AppBundle\\": "test/src/AppBundle/"
-        }
+            "Sylius\\Bundle\\TaxationBundle\\spec\\": "spec/"
+        },
+        "classmap": ["test/app/AppKernel.php"]
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/src/Sylius/Bundle/TaxationBundle/phpunit.xml.dist b/src/Sylius/Bundle/TaxationBundle/phpunit.xml.dist
index d6e7d454342..57d79f02857 100644
--- a/src/Sylius/Bundle/TaxationBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/TaxationBundle/phpunit.xml.dist
@@ -2,17 +2,16 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="test/app/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="test/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusTaxationBundle Test Suite">
             <directory>./test/</directory>
+            <directory>./Tests/</directory>
         </testsuite>
     </testsuites>
 </phpunit>
diff --git a/src/Sylius/Bundle/TaxationBundle/test/app/autoload.php b/src/Sylius/Bundle/TaxationBundle/test/app/autoload.php
deleted file mode 100644
index 3aa013d4ae1..00000000000
--- a/src/Sylius/Bundle/TaxationBundle/test/app/autoload.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-/*
- * This file is part of the Sylius package.
- *
- * (c) Paweł Jędrzejewski
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Doctrine\Common\Annotations\AnnotationRegistry;
-
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-require __DIR__ . '/AppKernel.php';
-
-AnnotationRegistry::registerLoader([$loader, 'loadClass']);
-
-return $loader;
diff --git a/src/Sylius/Bundle/TaxationBundle/test/src/Tests/SyliusTaxationBundleTest.php b/src/Sylius/Bundle/TaxationBundle/test/src/Tests/SyliusTaxationBundleTest.php
index de40cfb9a71..cd95df045df 100644
--- a/src/Sylius/Bundle/TaxationBundle/test/src/Tests/SyliusTaxationBundleTest.php
+++ b/src/Sylius/Bundle/TaxationBundle/test/src/Tests/SyliusTaxationBundleTest.php
@@ -13,7 +13,9 @@
 
 namespace Sylius\Bundle\TaxationBundle\Tests;
 
+use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusTaxationBundleTest extends WebTestCase
@@ -23,17 +25,17 @@ final class SyliusTaxationBundleTest extends WebTestCase
      */
     public function its_services_are_initializable(): void
     {
-        /** @var ContainerInterface $container */
+        /** @var ContainerBuilder $container */
         $container = self::createClient()->getContainer();
 
         $services = $container->getServiceIds();
 
-        $services = array_filter($services, function ($serviceId) {
+        $services = array_filter($services, function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
         foreach ($services as $id) {
-            $container->get($id);
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/TaxonomyBundle/Tests/Functional/SyliusTaxonomyBundleTest.php b/src/Sylius/Bundle/TaxonomyBundle/Tests/Functional/SyliusTaxonomyBundleTest.php
index 83bc4516c28..d1e5f1baa2c 100644
--- a/src/Sylius/Bundle/TaxonomyBundle/Tests/Functional/SyliusTaxonomyBundleTest.php
+++ b/src/Sylius/Bundle/TaxonomyBundle/Tests/Functional/SyliusTaxonomyBundleTest.php
@@ -16,6 +16,7 @@
 use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusTaxonomyBundleTest extends KernelTestCase
 {
@@ -29,12 +30,12 @@ public function its_services_are_initializable()
         /** @var Container $container */
         $container = self::$kernel->getContainer();
 
-        $serviceIds = array_filter($container->getServiceIds(), function ($serviceId) {
+        $serviceIds = array_filter($container->getServiceIds(), function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
-        foreach ($serviceIds as $serviceId) {
-            Assert::assertNotNull($container->get($serviceId));
+        foreach ($serviceIds as $id) {
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/TaxonomyBundle/phpunit.xml.dist b/src/Sylius/Bundle/TaxonomyBundle/phpunit.xml.dist
index 842ea7b5f9f..648009ad7f1 100644
--- a/src/Sylius/Bundle/TaxonomyBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/TaxonomyBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="Tests/Functional/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusTaxonomyBundle Test Suite">
             <directory>./Tests/</directory>
diff --git a/src/Sylius/Bundle/ThemeBundle/Tests/Functional/SyliusThemeBundleTest.php b/src/Sylius/Bundle/ThemeBundle/Tests/Functional/SyliusThemeBundleTest.php
index 4ce8988c5c2..383946eef96 100644
--- a/src/Sylius/Bundle/ThemeBundle/Tests/Functional/SyliusThemeBundleTest.php
+++ b/src/Sylius/Bundle/ThemeBundle/Tests/Functional/SyliusThemeBundleTest.php
@@ -16,6 +16,7 @@
 use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusThemeBundleTest extends KernelTestCase
 {
@@ -29,12 +30,12 @@ public function its_services_are_initializable(): void
         /** @var Container $container */
         $container = self::$kernel->getContainer();
 
-        $serviceIds = array_filter($container->getServiceIds(), function ($serviceId) {
+        $serviceIds = array_filter($container->getServiceIds(), function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
-        foreach ($serviceIds as $serviceId) {
-            Assert::assertNotNull($container->get($serviceId));
+        foreach ($serviceIds as $id) {
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/ThemeBundle/phpunit.xml.dist b/src/Sylius/Bundle/ThemeBundle/phpunit.xml.dist
index d167538f332..be8c4f257ad 100644
--- a/src/Sylius/Bundle/ThemeBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/ThemeBundle/phpunit.xml.dist
@@ -1,16 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="Tests/Functional/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusThemeBundle Test Suite">
             <directory>./Tests/</directory>
diff --git a/src/Sylius/Bundle/UserBundle/Tests/Functional/SyliusUserBundleTest.php b/src/Sylius/Bundle/UserBundle/Tests/Functional/SyliusUserBundleTest.php
index f2de2de0f42..b0f67075665 100644
--- a/src/Sylius/Bundle/UserBundle/Tests/Functional/SyliusUserBundleTest.php
+++ b/src/Sylius/Bundle/UserBundle/Tests/Functional/SyliusUserBundleTest.php
@@ -16,6 +16,7 @@
 use PHPUnit\Framework\Assert;
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 final class SyliusUserBundleTest extends KernelTestCase
 {
@@ -29,12 +30,12 @@ public function its_services_are_initializable()
         /** @var Container $container */
         $container = self::$kernel->getContainer();
 
-        $serviceIds = array_filter($container->getServiceIds(), function ($serviceId) {
+        $serviceIds = array_filter($container->getServiceIds(), function (string $serviceId): bool {
             return 0 === strpos($serviceId, 'sylius.');
         });
 
-        foreach ($serviceIds as $serviceId) {
-            Assert::assertNotNull($container->get($serviceId));
+        foreach ($serviceIds as $id) {
+            Assert::assertNotNull($container->get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE));
         }
     }
 }
diff --git a/src/Sylius/Bundle/UserBundle/phpunit.xml.dist b/src/Sylius/Bundle/UserBundle/phpunit.xml.dist
index a501e1e8fa0..ea4f8b74a65 100644
--- a/src/Sylius/Bundle/UserBundle/phpunit.xml.dist
+++ b/src/Sylius/Bundle/UserBundle/phpunit.xml.dist
@@ -2,14 +2,12 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
 >
     <php>
-        <server name="KERNEL_DIR" value="Tests/Functional/app/" />
-        <server name="IS_DOCTRINE_ORM_SUPPORTED" value="true" />
+        <server name="KERNEL_CLASS" value="AppKernel" />
     </php>
+
     <testsuites>
         <testsuite name="SyliusUserBundle Test Suite">
             <directory>./Tests/</directory>
diff --git a/src/Sylius/Component/Core/composer.json b/src/Sylius/Component/Core/composer.json
index 10c2a043d08..cd055bbaf0f 100644
--- a/src/Sylius/Component/Core/composer.json
+++ b/src/Sylius/Component/Core/composer.json
@@ -22,7 +22,7 @@
     "require": {
         "php": "^7.1",
 
-        "knplabs/gaufrette": "^0.2",
+        "knplabs/gaufrette": "^0.5",
         "payum/payum": "^1.3",
         "php-http/guzzle6-adapter": "^1.1",
         "sylius/addressing": "^1.0",