Add tests for int backed enum and enum without backing

Tests/Functional/Entity/ArticleType81IntBacked.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Nelmio\ApiDocBundle\Tests\Functional\Entity;
+
+enum ArticleType81IntBacked: int
+{
+    case DRAFT = 0;
+    case FINAL = 1;
+}

Tests/Functional/Entity/ArticleType81NotBacked.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Nelmio\ApiDocBundle\Tests\Functional\Entity;
+
+enum ArticleType81IntBacked
+{
+    case DRAFT;
+    case FINAL;
+}

Tests/Functional/FunctionalTest.php

@@ -659,6 +659,17 @@ public function testEnumSupport()
 
         $this->assertSame('string', $model->type);
         $this->assertCount(2, $model->enum);
+
+        $model = $this->getModel('ArticleType81NotBacked');
+
+        $this->assertSame('string', $model->type);
+        $this->assertCount(2, $model->enum);
+
+
+        $model = $this->getModel('ArticleType81IntBacked');
+
+        $this->assertSame('integer', $model->type);
+        $this->assertCount(2, $model->enum);
     }
 
     public function testEntitiesWithOverriddenSchemaTypeDoNotReadOtherProperties()