added assertion

Author: Nazar65

dev/tests/setup-integration/_files/Magento/TestSetupDeclarationModule1/fixture/declarative_installer/constraint_modification.php

@@ -38,6 +38,7 @@
   `longtext` longtext,
   `mediumtext` mediumtext,
   `varchar` varchar(254) DEFAULT NULL,
+  `char` char(255) DEFAULT NULL,
   `mediumblob` mediumblob,
   `blob` blob,
   `boolean` tinyint(1) DEFAULT NULL,