diff --git a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php
index 5993669..245d8f3 100644
--- a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php
@@ -34,6 +34,13 @@ class LibraryDiscoveryCollectorTest extends UnitTestCase {
   protected $libraryDiscoveryParser;
 
   /**
+   * The mock cache contexts object.
+   *
+   * @var \Drupal\Core\Cache\CacheContexts|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $cacheContexts;
+
+  /**
    * The library discovery collector under test.
    *
    * @var \Drupal\Core\Asset\LibraryDiscoveryCollector
@@ -65,8 +72,15 @@ protected function setUp() {
     $this->libraryDiscoveryParser = $this->getMockBuilder('Drupal\Core\Asset\LibraryDiscoveryParser')
       ->disableOriginalConstructor()
       ->getMock();
+    $this->cacheContexts = $this->getMockBuilder('Drupal\Core\Cache\CacheContexts')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->cacheContexts->expects($this->any())
+      ->method('convertTokensToKeys')
+      ->with(['library_info', 'cache_context.user.roles', 'cache_context.is_admin_route'])
+      ->will($this->returnValue(['library_info']));
 
-    $this->libraryDiscoveryCollector = new LibraryDiscoveryCollector($this->cache, $this->lock, $this->libraryDiscoveryParser);
+    $this->libraryDiscoveryCollector = new LibraryDiscoveryCollector($this->cache, $this->lock, $this->libraryDiscoveryParser, $this->cacheContexts);
   }
 
   /**