diff --git a/tests/ArchTest.php b/tests/ArchTest.php
index c8e9df0..2a41074 100644
--- a/tests/ArchTest.php
+++ b/tests/ArchTest.php
@@ -6,8 +6,6 @@ class ArchTest extends TestCase
 {
     public function testDebuggingFunctionsNotUsed()
     {
-        $this->assertNotContains('dd', ['dd', 'dump', 'ray']);
-        $this->assertNotContains('dump', ['dd', 'dump', 'ray']);
-        $this->assertNotContains('ray', ['dd', 'dump', 'ray']);
+        $this->expect(['dd', 'dump', 'ray'])->not->toBeUsed();
     }
 }