diff --git a/src/core/Ab/AbContainer.php b/src/core/Ab/AbContainer.php
index 0c947b8..a32ff76 100644
--- a/src/core/Ab/AbContainer.php
+++ b/src/core/Ab/AbContainer.php
@@ -7,11 +7,11 @@ namespace App\Core\Ab;
  *
  * @author Simon Vieille <simon@deblan.fr>
  */
-class AbContainer
+class AbContainer implements AbContainerInterface
 {
     protected array $tests = [];
 
-    public function add(AbTest $test): self
+    public function add(AbTestInterface $test): self
     {
         $this->tests[$test->getName()] = $test;
 
@@ -23,7 +23,7 @@ class AbContainer
         return isset($this->tests[$name]);
     }
 
-    public function get(string $name): AbTest
+    public function get(string $name): AbTestInterface
     {
         return $this->tests[$name];
     }
diff --git a/src/core/Ab/AbTest.php b/src/core/Ab/AbTest.php
index 51984ba..47f52c4 100644
--- a/src/core/Ab/AbTest.php
+++ b/src/core/Ab/AbTest.php
@@ -7,7 +7,7 @@ namespace App\Core\Ab;
  *
  * @author Simon Vieille <simon@deblan.fr>
  */
-class AbTest
+class AbTest implements AbTestInterface
 {
     protected $results;
     protected string $name;
@@ -106,7 +106,7 @@ class AbTest
 
         krsort($this->probabilities);
 
-        $number = \rand(0, (int) \array_sum($this->probabilities) * 10);
+        $number = mt_rand(0, (int) array_sum($this->probabilities) * 10);
         $starter = 0;
         $return = '';
 
diff --git a/src/core/Resources/views/site/node_admin/_form.html.twig b/src/core/Resources/views/site/node_admin/_form.html.twig
index 25b53f3..6ce769c 100644
--- a/src/core/Resources/views/site/node_admin/_form.html.twig
+++ b/src/core/Resources/views/site/node_admin/_form.html.twig
@@ -221,7 +221,7 @@
             <div class="col-md-12">
                 {{ form_row(form.hasAbTest) }}
             </div>
-            <div class="col-md-6 {% if not form.vars.data.abTestCode %}d-none{% endif %}">
+            <div class="col-md-6 {% if not form.vars.data.hasAbTest %}d-none{% endif %}">
                 {{ form_row(form.abTestCode) }}
             </div>
         </div>
diff --git a/src/core/Twig/Extension/AbTestExtension.php b/src/core/Twig/Extension/AbTestExtension.php
index f3ebf8d..3727c17 100644
--- a/src/core/Twig/Extension/AbTestExtension.php
+++ b/src/core/Twig/Extension/AbTestExtension.php
@@ -3,9 +3,9 @@
 namespace App\Core\Twig\Extension;
 
 use App\Core\Ab\AbContainer;
-use App\Core\Ab\AbTest;
 use Twig\Extension\AbstractExtension;
 use Twig\TwigFunction;
+use App\Core\Ab\AbTestInterface;
 
 class AbTestExtension extends AbstractExtension
 {
@@ -31,7 +31,7 @@ class AbTestExtension extends AbstractExtension
         return $this->container->has($name);
     }
 
-    public function get(string $name): AbTest
+    public function get(string $name): AbTestInterface
     {
         return $this->container->get($name);
     }