use constant directing attention to what's tested

To avoid the impression of testing the wrong thing/two things at once

tests/EdgeToEdge/Routes/ShowMembershipConfirmationRouteTest.php

@@ -110,7 +110,7 @@ public function testCallOnUnknownApplicationId_deniedPageIsShown(): void {
 				self::PATH,
 				[
 					'id' => self::UNKNOWN_APPLICATION_ID,
-					'accessToken' => self::WRONG_ACCESS_TOKEN
+					'accessToken' => self::CORRECT_ACCESS_TOKEN
 				]
 			);