diff --git a/composer.json b/composer.json
index 21f45cc..2beae22 100644
--- a/composer.json
+++ b/composer.json
@@ -51,7 +51,7 @@
         "doctrine/doctrine-bundle": "^1.8",
         "friendsofphp/php-cs-fixer": "^2.10",
         "phpstan/phpstan": "^0.9",
-        "phpunit/phpunit": "^4.5 || ^5.0 || ^6.0 || ^7.0",
+        "phpunit/phpunit": "^5.7.10 || ^6.0 || ^7.0",
         "symfony/asset": "^3.4 || ^4.0",
         "symfony/dom-crawler": "^3.0",
         "symfony/framework-bundle": "^3.4 || ^4.0",
diff --git a/features/bootstrap/FeatureContext.php b/features/bootstrap/FeatureContext.php
index b513772..58761e1 100755
--- a/features/bootstrap/FeatureContext.php
+++ b/features/bootstrap/FeatureContext.php
@@ -148,6 +148,7 @@ public function theJsonOutputShouldBeEqualTo(PyStringNode $text)
             throw new \LogicException('Invalid JSON.');
         }
         $diff = array_map('unserialize', array_diff(array_map('serialize', $output), array_map('serialize', $json)));
+
         if (0 < count($diff)) {
             throw new \LogicException("JSON response does not match:\n".print_r($diff, true));
         }
diff --git a/features/extension.feature b/features/extension.feature
index ad60e6d..0aeeb2a 100644
--- a/features/extension.feature
+++ b/features/extension.feature
@@ -50,6 +50,9 @@ Feature: I can execute Behat tests with current API Extension
                     "name"
                 ]
             },
+            "ean13": {
+                "type": "any"
+            },
             "name": {
                 "type": [
                     "string"
@@ -146,6 +149,7 @@ Feature: I can execute Behat tests with current API Extension
             "@type",
             "id",
             "company",
+            "ean13",
             "name",
             "active",
             "price",
diff --git a/tests/app/Entity/Beer.php b/tests/app/Entity/Beer.php
index 711cf6a..9fc4e1d 100644
--- a/tests/app/Entity/Beer.php
+++ b/tests/app/Entity/Beer.php
@@ -56,6 +56,14 @@ class Beer
      */
     private $company;
 
+    /**
+     * @var string
+     * @ORM\Column(type="ean")
+     * @Groups({"beer_read", "beer_write"})
+     * @Assert\NotBlank
+     */
+    private $ean13;
+
     /**
      * @var string
      * @ORM\Column
@@ -334,4 +342,21 @@ public function setMisc($misc = null)
     {
         $this->misc = $misc;
     }
+
+    /**
+     * @return string
+     */
+    public function getEan13(): string
+    {
+        return $this->ean13;
+    }
+
+    /**
+     * @param string $ean13
+     */
+    public function setEan13(string $ean13)
+    {
+        $this->ean13 = $ean13;
+    }
+
 }
diff --git a/tests/app/Kernel.php b/tests/app/Kernel.php
index 08b7728..7b18384 100644
--- a/tests/app/Kernel.php
+++ b/tests/app/Kernel.php
@@ -61,6 +61,12 @@ protected function configureContainer(ContainerBuilder $c, LoaderInterface $load
                 'driver' => 'pdo_sqlite',
                 'path' => '%kernel.cache_dir%/db.sqlite',
                 'charset' => 'UTF8',
+                'mapping_types' =>  [
+                    'ean' => 'string',
+                ],
+                'types' => [
+                    'ean' => 'ApiExtension\App\Type\EanType',
+                ],
             ],
             'orm' => [
                 'auto_generate_proxy_classes' => true,
diff --git a/tests/app/Populator/Guesser/Ean13Guesser.php b/tests/app/Populator/Guesser/Ean13Guesser.php
new file mode 100644
index 0000000..a5c0010
--- /dev/null
+++ b/tests/app/Populator/Guesser/Ean13Guesser.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ApiExtension\App\Populator\Guesser;
+
+use Doctrine\DBAL\Types\Type;
+use ApiExtension\App\Type\EanType;
+use ApiExtension\Populator\Guesser\AbstractGuesser;
+
+/**
+ * @author Mathieu Dewet <mathieu.dewet@gmail.com>
+ */
+class Ean13Guesser extends AbstractGuesser
+{
+    public function supports(array $mapping): bool
+    {
+        return \in_array($mapping['type'], [EanType::EAN], true);
+    }
+    public function getValue(array $mapping): string
+    {
+        return $this->faker->ean13;
+    }
+}
diff --git a/tests/app/Type/EanType.php b/tests/app/Type/EanType.php
new file mode 100644
index 0000000..224758c
--- /dev/null
+++ b/tests/app/Type/EanType.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace ApiExtension\App\Type;
+
+use Doctrine\DBAL\Types\Type;
+use Doctrine\DBAL\Platforms\AbstractPlatform;
+
+/**
+ * My custom ean type.
+ */
+class EanType extends Type
+{
+    const EAN = 'ean';
+
+    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
+    {
+        $fieldDeclaration['length'] = 13;
+
+        return $platform->getVarcharTypeDeclarationSQL($fieldDeclaration);
+    }
+
+    public function convertToPHPValue($value, AbstractPlatform $platform)
+    {
+        return (string) trim($value);
+    }
+
+    public function convertToDatabaseValue($value, AbstractPlatform $platform)
+    {
+        return (string) trim($value);
+    }
+
+    public function getName()
+    {
+        return self::EAN;
+    }
+}
diff --git a/tests/app/behat.yml.dist b/tests/app/behat.yml.dist
index c78dc69..e2d742b 100644
--- a/tests/app/behat.yml.dist
+++ b/tests/app/behat.yml.dist
@@ -23,6 +23,8 @@ default:
                     symfony2: ~
         Behatch\Extension: ~
         ApiExtension:
+            guessers:
+                - ApiExtension\App\Populator\Guesser\Ean13Guesser
             services:
                 metadataFactory: '@test.api_platform.metadata.resource.metadata_factory.annotation'
                 iriConverter: '@test.api_platform.iri_converter'
diff --git a/tests/app/features/bootstrap/FeatureContext.php b/tests/app/features/bootstrap/FeatureContext.php
index d77992f..34353ca 100644
--- a/tests/app/features/bootstrap/FeatureContext.php
+++ b/tests/app/features/bootstrap/FeatureContext.php
@@ -15,7 +15,8 @@
 use Doctrine\Common\DataFixtures\Purger\ORMPurger;
 use Doctrine\Common\Persistence\ManagerRegistry;
 use Doctrine\ORM\Tools\SchemaTool;
-
+use Doctrine\DBAL\Types\Type;
+use ApiExtension\App\Type\EanType;
 /**
  * @author Vincent Chalamon <vincentchalamon@gmail.com>
  */
@@ -28,6 +29,9 @@ public function __construct(ManagerRegistry $doctrine, string $cacheDir)
     {
         $this->doctrine = $doctrine;
         $this->cacheDir = $cacheDir;
+        if (!Type::hasType(EanType::EAN)) {
+            Type::addType('ean', EanType::class);
+        }
     }
 
     /**