Fix test about removing an entity

Author: johndodev

tests/Integration/EngineTest.php

@@ -45,7 +45,7 @@ public function testIndexingEmptyEntity(): void
 
         // Remove
         $result = $this->engine->remove($searchableImage);
-        $this->assertEmpty($result);
+        $this->assertArrayHasKey('sf_phpunit__image', $result);
 
         // Update
         $result = $this->engine->index($searchableImage);