diff --git a/tests/Unit/PHPStan/Lib/TypeNarrowerTest.php b/tests/Unit/PHPStan/Lib/TypeNarrowerTest.php
index dd959df..79be96e 100644
--- a/tests/Unit/PHPStan/Lib/TypeNarrowerTest.php
+++ b/tests/Unit/PHPStan/Lib/TypeNarrowerTest.php
@@ -19,6 +19,7 @@ public function testGetTypesFromStringArray(): void
         $arg = new Arg($this->createMock(Expr::class));
 
         $narrower = $this->getMockBuilder(TypeNarrower::class)
+            ->onlyMethods([])
             ->disableOriginalConstructor()
             ->getMock();