diff --git a/tests/unit/web/twig/ExtensionTest.php b/tests/unit/web/twig/ExtensionTest.php
index f80684332d8..72650fa383b 100644
--- a/tests/unit/web/twig/ExtensionTest.php
+++ b/tests/unit/web/twig/ExtensionTest.php
@@ -980,9 +980,9 @@ public function testCloneFunction(): void
      */
     public function testDataUrlFunction(): void
     {
-        $path = dirname(__DIR__, 3) . '/_data/assets/files/craft-logo.svg';
+        $path = dirname(__DIR__, 4) . '/.github/workflows/ci.yml';
         $dataUrl = $this->view->renderString('{{ dataUrl(path) }}', compact('path'));
-        self::assertStringStartsWith('data:image/svg+xml;base64,', $dataUrl);
+        self::assertStringStartsWith('data:application/x-yaml;base64,', $dataUrl);
     }
 
     public function testExpressionFunction(): void