diff --git a/tests/Boilerplate/index.html b/tests/Boilerplate/index.html
index ea563a9..676e5ab 100644
--- a/tests/Boilerplate/index.html
+++ b/tests/Boilerplate/index.html
@@ -86,7 +86,7 @@ <h1>Test Background Image</h1>
         <script src="https://github.com/renatomarinho/laravel-page-speed/test/Boilerplate/js/vendor/modernizr-3.5.0.min.js"></script>
         <script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
         <script>window.jQuery || document.write('<script src="js/vendor/jquery-3.2.1.min.js"><\/script>')</script>
-        <script src="https://github.com/renatomarinho/laravel-page-speed/test/Boilerplate/js/plugins.js"></script>
+        <script src="https://github.com/renatomarinho/laravel-page-speed/test/Boilerplate/js/plugins.js" data-pagespeed-no-defer></script>
         <script src="https://github.com/renatomarinho/laravel-page-speed/test/Boilerplate/js/main.js"></script>
 
         <button type="submit" value="1000" name="tip" class="btn"><img src="/images/1000coin.png"/></button>
diff --git a/tests/Middleware/DeferJavascriptTest.php b/tests/Middleware/DeferJavascriptTest.php
index 98cedd5..e5872fc 100644
--- a/tests/Middleware/DeferJavascriptTest.php
+++ b/tests/Middleware/DeferJavascriptTest.php
@@ -7,14 +7,15 @@
 
 class DeferJavascriptTest extends TestCase
 {
-    public function test_defer_javascript()
+    public function testDeferJavascript()
     {
         $response = $this->middleware->handle($this->request, $this->getNext());
 
-        $this->assertContains('Boilerplate/js/main.js" defer', $response->getContent());
-        $this->assertNotContains('analytics.js" async defer defer', $response->getContent());
-        $this->assertNotContains('analytics.js" async defer defer', $response->getContent());
-        $this->assertNotContains('<script defer>window.jQuery', $response->getContent());
+        $this->assertStringContainsString('Boilerplate/js/main.js" defer></script>', $response->getContent());
+        $this->assertStringContainsString('Boilerplate/js/plugins.js" data-pagespeed-no-defer></script>', $response->getContent());
+
+        $this->assertStringNotContainsString('analytics.js" async defer defer></script>', $response->getContent());
+        $this->assertStringNotContainsString('<script defer>window.jQuery', $response->getContent());
     }
 
     protected function getMiddleware()