diff -u b/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php b/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php
--- b/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/CacheFactoryTest.php
@@ -152,22 +152,22 @@
    * @covers ::get
    */
   public function testCacheFactoryBinBackendServiceExist() {
-    $settings = new Settings(array(
-      'cache' => array(
-        'bins' => array(
+    $settings = new Settings([
+      'cache' => [
+        'bins' => [
           'render' => 'cache.backend.custom',
-        ),
-      ),
-    ));
+        ],
+      ],
+    ]);
     $cache_factory = new CacheFactory($settings);
 
     $container = new ContainerBuilder();
     $cache_factory->setContainer($container);
 
-    $builtin_default_backend_factory = $this->getMock('\Drupal\Core\Cache\CacheFactoryInterface');
+    $builtin_default_backend_factory = $this->createMock('\Drupal\Core\Cache\CacheFactoryInterface');
     $container->set('cache.backend.database', $builtin_default_backend_factory);
 
-    $render_bin = $this->getMock('\Drupal\Core\Cache\CacheBackendInterface');
+    $render_bin = $this->createMock('\Drupal\Core\Cache\CacheBackendInterface');
     $builtin_default_backend_factory->expects($this->once())
       ->method('get')
       ->with('render')
@@ -184,20 +184,20 @@
    * @covers ::get
    */
   public function testCacheFactoryBinBackendDefaultServiceExist() {
-    $settings = new Settings(array(
-      'cache' => array(
+    $settings = new Settings([
+      'cache' => [
         'default' => 'cache.backend.custom',
-      ),
-    ));
+      ],
+    ]);
     $cache_factory = new CacheFactory($settings);
 
     $container = new ContainerBuilder();
     $cache_factory->setContainer($container);
 
-    $builtin_default_backend_factory = $this->getMock('\Drupal\Core\Cache\CacheFactoryInterface');
+    $builtin_default_backend_factory = $this->createMock('\Drupal\Core\Cache\CacheFactoryInterface');
     $container->set('cache.backend.database', $builtin_default_backend_factory);
 
-    $render_bin = $this->getMock('\Drupal\Core\Cache\CacheBackendInterface');
+    $render_bin = $this->createMock('\Drupal\Core\Cache\CacheBackendInterface');
     $builtin_default_backend_factory->expects($this->once())
       ->method('get')
       ->with('render')