fix test

Author: paulbalandan

tests/system/Validation/StrictRules/FileRulesTest.php

@@ -19,6 +19,8 @@
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Validation\Validation;
 use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\PreserveGlobalState;
+use PHPUnit\Framework\Attributes\RunInSeparateProcess;
 use Tests\Support\Validation\TestRules;
 
 /**
@@ -164,11 +166,15 @@ public function testUploadedPassesForSingleValidFile(): void
         $this->assertTrue($this->validation->run([]));
     }
 
+    #[PreserveGlobalState(false)]
+    #[RunInSeparateProcess]
     public function testUploadedFailsInProductionWhenFileWasNotHttpUpload(): void
     {
         // Counterpart to testUploadedPassesForSingleValidFile: the same fixture
         // passes in the testing env but must fail in production, where isValid()
-        // enforces is_uploaded_file().
+        // enforces is_uploaded_file(). Runs in a separate process because the
+        // namespace-level is_uploaded_file() override in FileMovingTest.php would
+        // otherwise leak in and make the fixture appear to be a valid upload.
         Services::injectMock('environmentdetector', new EnvironmentDetector('production'));
 
         $this->validation->setRules(['avatar' => 'uploaded[avatar]']);