Fix UselessCastRuleTest.

Author: mad-briller

Diff for: tests/Rules/Cast/UselessCastRuleTest.php

@@ -44,6 +44,11 @@ public function testUselessCast(): void
 					'Casting to float something that\'s already float.',
 					27,
 				],
+				[
+					'Casting to string something that\'s already string.',
+					39,
+					'Because the type is coming from a PHPDoc, you can turn off this check by setting <fg=cyan>treatPhpDocTypesAsCertain: false</> in your <fg=cyan>%configurationFile%</>.',
+				],
 				[
 					'Casting to string something that\'s already string.',
 					46,