Issue #2910775 by Sivaji, Hardik_Patel_12, hchonov, Mile23: Add test case for...

Issue #2910775 by Sivaji, Hardik_Patel_12, hchonov, Mile23: Add test case for EntityType::getHandlerClass returning NULL

(cherry picked from commit b6bf07b8)

core/lib/Drupal/Core/Entity/EntityType.php

@@ -465,6 +465,7 @@ public function getHandlerClass($handler_type, $nested = FALSE) {
       $handlers = $this->getHandlerClasses();
       return $nested ? $handlers[$handler_type][$nested] : $handlers[$handler_type];
     }
+    return NULL;
   }
 
   /**

core/tests/Drupal/Tests/Core/Entity/EntityTypeTest.php

@@ -167,6 +167,8 @@ public function testGetHandler() {
     ]);
     $this->assertSame($controller, $entity_type->getHandlerClass('storage'));
     $this->assertSame($controller, $entity_type->getHandlerClass('form', 'default'));
+    $this->assertNull($entity_type->getHandlerClass('foo'));
+    $this->assertNull($entity_type->getHandlerClass('foo', 'bar'));
   }
 
   /**