diff --git a/tests/unit/PseudoTypes/ArrayShapeTest.php b/tests/unit/PseudoTypes/ArrayShapeTest.php
index 314d030..3a548f4 100644
--- a/tests/unit/PseudoTypes/ArrayShapeTest.php
+++ b/tests/unit/PseudoTypes/ArrayShapeTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace phpDocumentor\Reflection\PseudoTypes;
 
 use PHPUnit\Framework\TestCase;
@@ -18,4 +20,4 @@ public function testExposeItems(): void
 
         $this->assertSame([$item1, $item2], $arrayShape->getItems());
     }
-}
\ No newline at end of file
+}