add check for isBuiltin method

Author: karyna-t

src/Magento/FunctionalTestingFramework/Code/Reader/ClassReader.php

@@ -24,8 +24,9 @@ public function getConstructor($className)
             /** @var $parameter \ReflectionParameter */
             foreach ($constructor->getParameters() as $parameter) {
                 try {
-                    $name = $parameter->getType() && !$parameter->getType()->isBuiltin()
-                        ? new \ReflectionClass($parameter->getType()->getName())
+                    $paramType = $parameter->getType();
+                    $name = ($paramType && method_exists($paramType, 'isBuiltin') && !$paramType->isBuiltin())
+                        ? new \ReflectionClass($paramType->getName())
                         : null;
                     $result[] = [
                         $parameter->getName(),

src/Magento/FunctionalTestingFramework/System/Code/ClassReader.php

@@ -31,8 +31,9 @@ public function getParameters($className, $method)
             /** @var $parameter \ReflectionParameter */
             foreach ($method->getParameters() as $parameter) {
                 try {
-                    $name = $parameter->getType() && !$parameter->getType()->isBuiltin()
-                        ? new \ReflectionClass($parameter->getType()->getName())
+                    $paramType = $parameter->getType();
+                    $name = ($paramType && method_exists($paramType, 'isBuiltin') && !$paramType->isBuiltin())
+                        ? new \ReflectionClass($paramType->getName())
                         : null;
                     $result[$parameter->getName()] = [
                         $parameter->getName(),