chore: add phpstan check to tests/

Author: kenjis

phpstan.neon.dist

@@ -16,6 +16,7 @@ parameters:
 	paths:
 		- app
 		- system
+		- tests
 		- utils/PHPStan
 	excludePaths:
 		- app/Views/errors/cli/*
@@ -26,6 +27,7 @@ parameters:
 		- system/Test/Filters/CITestStreamFilter.php
 		- system/ThirdParty/*
 		- system/Validation/Views/single.php
+		- tests/system/View/Views/*
 	scanDirectories:
 		- system/Helpers
 	checkGenericClassInNonGenericObjectType: false