diff --git a/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php b/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
index eb98cb8..3571efb 100644
--- a/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
+++ b/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
@@ -27,35 +27,68 @@ class HtmlResponseAttachmentsTest extends WebTestBase {
    * Test rendering of ['#attached'].
    */
   public function testAttachments() {
-    // We only have one test method here in order to speed up test execution.
+    // Test ['#attached']['http_header] = ['Status', $code].
     $this->drupalGet('/render_attached_test/teapot');
     $this->assertResponse(418);
+    $this->assertHeader('X-Drupal-Cache', 'MISS');
+    // Repeat for the cache.
+    $this->drupalGet('/render_attached_test/teapot');
+    $this->assertResponse(418);
+    $this->assertHeader('X-Drupal-Cache', 'HIT');
 
+    // Test ['#attached']['html_head'] with various replacement rules.
     $this->drupalGet('/render_attached_test/head');
     $this->assertHeader('X-Test-Teapot', 'Teapot Mode Active');
     $this->assertHeader('X-Test-Teapot-Replace', 'Teapot replaced');
     $this->assertHeader('X-Test-Teapot-No-Replace', 'This value is not replaced,This one is added');
+    $this->assertHeader('X-Drupal-Cache', 'MISS');
+    // Repeat for the cache.
+    $this->drupalGet('/render_attached_test/head');
+    $this->assertHeader('X-Drupal-Cache', 'HIT');
 
+    // Test ['#attached']['feed'].
+    // @todo: Improve this test.
     $this->drupalGet('/render_attached_test/feed');
     $this->assertEqual(1, count($this->xpath('//head/link[@rel="alternate"]')), 'Link has rel="alternate"');
     $this->assertEqual(1, count($this->xpath('//head/link[@type="application/rss+xml"]')), 'Link has proper content type.');
     $this->assertEqual(1, count($this->xpath('//head/link[@href="test://url"]')), 'Link has URL.');
     $this->assertEqual(1, count($this->xpath('//head/link[@title=""]')), 'Link has title.');
+    $this->assertHeader('X-Drupal-Cache', 'MISS');
+    // Repeat for the cache.
+    $this->drupalGet('/render_attached_test/feed');
+    $this->assertHeader('X-Drupal-Cache', 'HIT');
 
     // Now repeat the process using drupal_process_attached().
+    // Test ['#attached']['http_header] = ['Status', $code].
     $this->drupalGet('/render_attached_test/teapot_dpa');
     $this->assertResponse(418);
+    $this->assertHeader('X-Drupal-Cache', 'MISS');
+    // Repeat for the cache.
+    $this->drupalGet('/render_attached_test/teapot_dpa');
+    $this->assertResponse(418);
+    $this->assertHeader('X-Drupal-Cache', 'HIT');
 
+    // Test ['#attached']['html_head'] with various replacement rules.
     $this->drupalGet('/render_attached_test/head_dpa');
     $this->assertHeader('X-Test-Teapot', 'Teapot Mode Active');
     $this->assertHeader('X-Test-Teapot-Replace', 'Teapot replaced');
     $this->assertHeader('X-Test-Teapot-No-Replace', 'This value is not replaced,This one is added');
+    $this->assertHeader('X-Drupal-Cache', 'MISS');
+    // Repeat for the cache.
+    $this->drupalGet('/render_attached_test/head_dpa');
+    $this->assertHeader('X-Drupal-Cache', 'HIT');
 
+    // Test ['#attached']['feed'].
+    // @todo: Improve this test.
     $this->drupalGet('/render_attached_test/feed_dpa');
     $this->assertEqual(1, count($this->xpath('//head/link[@rel="alternate"]')), 'Link has rel="alternate"');
     $this->assertEqual(1, count($this->xpath('//head/link[@type="application/rss+xml"]')), 'Link has proper content type.');
     $this->assertEqual(1, count($this->xpath('//head/link[@href="test://url"]')), 'Link has URL.');
     $this->assertEqual(1, count($this->xpath('//head/link[@title=""]')), 'Link has title.');
+    $this->assertHeader('X-Drupal-Cache', 'MISS');
+    // Repeat for the cache.
+    $this->drupalGet('/render_attached_test/feed_dpa');
+    $this->assertHeader('X-Drupal-Cache', 'HIT');
   }
 
 }