Add test case to demonstrate there is no bug in this case

Author: matthiasnoback

Tests/Functional/Fixtures/reported_problems.yml

@@ -17,3 +17,15 @@ services:
         class: Matthias\SymfonyServiceDefinitionValidator\Tests\Functional\Fixtures\Validator
         factory_service: validator_builder
         factory_method: build
+
+    # Issue 11: https://github.com/matthiasnoback/symfony-service-definition-validator/issues/11
+    # It is alright for the factory service to be private
+    service_created_by_private_factory:
+        class: stdClass
+        factory_service: private_factory
+        factory_method: create
+        arguments:
+            - required_argument
+    private_factory:
+        class: Matthias\SymfonyServiceDefinitionValidator\Tests\Functional\Fixtures\Factory
+        private: true