diff --git a/src/Bundle/ChillDocGeneratorBundle/Context/ContextManager.php b/src/Bundle/ChillDocGeneratorBundle/Context/ContextManager.php
index 8dfecb730..b8f4d0eed 100644
--- a/src/Bundle/ChillDocGeneratorBundle/Context/ContextManager.php
+++ b/src/Bundle/ChillDocGeneratorBundle/Context/ContextManager.php
@@ -14,7 +14,7 @@ namespace Chill\DocGeneratorBundle\Context;
 use Chill\DocGeneratorBundle\Context\Exception\ContextNotFoundException;
 use Chill\DocGeneratorBundle\Entity\DocGeneratorTemplate;
 
-class ContextManager
+final class ContextManager implements ContextManagerInterface
 {
     /**
      * @var DocGeneratorContextInterface[]|iterable
@@ -26,9 +26,6 @@ class ContextManager
         $this->contexts = $contexts;
     }
 
-    /**
-     * @throw ContextNotFoundException when the context is not  found
-     */
     public function getContextByDocGeneratorTemplate(DocGeneratorTemplate $docGeneratorTemplate): DocGeneratorContextInterface
     {
         foreach ($this->contexts as $key => $context) {
diff --git a/src/Bundle/ChillDocGeneratorBundle/Context/ContextManagerInterface.php b/src/Bundle/ChillDocGeneratorBundle/Context/ContextManagerInterface.php
new file mode 100644
index 000000000..3468d787d
--- /dev/null
+++ b/src/Bundle/ChillDocGeneratorBundle/Context/ContextManagerInterface.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Chill\DocGeneratorBundle\Context;
+
+use Chill\DocGeneratorBundle\Context\Exception\ContextNotFoundException;
+use Chill\DocGeneratorBundle\Entity\DocGeneratorTemplate;
+
+interface ContextManagerInterface
+{
+    /**
+     * @throws ContextNotFoundException When the context is not found.
+     */
+    public function getContextByDocGeneratorTemplate(DocGeneratorTemplate $docGeneratorTemplate): DocGeneratorContextInterface;
+
+    /**
+     * @throws ContextNotFoundException When the context is not found.
+     */
+    public function getContextByKey(string $searchedKey): DocGeneratorContextInterface;
+
+    public function getContexts(): array;
+}