refactor: add strict types to tests (#9953)

Author: paulbalandan

.php-cs-fixer.tests.php

@@ -30,6 +30,7 @@
     ]);
 
 $overrides = [
+    'declare_strict_types'  => true,
     'phpdoc_to_return_type' => true,
     'void_return'           => true,
 ];

tests/_support/Commands/Foobar.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * This file is part of CodeIgniter 4 framework.
  *

utils/src/PhpCsFixer/CodeIgniterRuleCustomisationPolicy.php

@@ -33,6 +33,10 @@ public function getRuleCustomisers(): array
         $normalisedStrEndsWith = static fn (string $haystack, string $needle): bool => str_ends_with(str_replace('\\', '/', $haystack), $needle);
 
         return [
+            'declare_strict_types' => static fn (SplFileInfo $file): bool => ! $normalisedStrEndsWith(
+                $file->getPathname(),
+                '/tests/system/Debug/ExceptionsTest.php',
+            ),
             'native_function_casing' => static fn (SplFileInfo $file): bool => ! $normalisedStrEndsWith(
                 $file->getPathname(),
                 '/tests/system/Database/Live/PreparedQueryTest.php',