Issue #2231419 by sun, jibran, Rajendar Reddy, Jalandhar, damiankloip: Merge...

Issue #2231419 by sun, jibran, Rajendar Reddy, Jalandhar, damiankloip: Merge obsolete CachedModuleHandler into ModuleHandler.

core/core.services.yml

@@ -191,8 +191,8 @@ services:
     abstract: true
     arguments: ['@container.namespaces', '@cache.discovery', '@language_manager', '@module_handler']
   module_handler:
-    class: Drupal\Core\Extension\CachedModuleHandler
-    arguments: ['%container.modules%', '@state', '@cache.bootstrap']
+    class: Drupal\Core\Extension\ModuleHandler
+    arguments: ['%container.modules%', '@cache.bootstrap']
   theme_handler:
     class: Drupal\Core\Extension\ThemeHandler
     arguments: ['@config.factory', '@module_handler', '@cache.default', '@info_parser', '@config.installer', '@router.builder']

core/lib/Drupal/Core/EventSubscriber/RequestCloseSubscriber.php

@@ -8,7 +8,6 @@
 namespace Drupal\Core\EventSubscriber;
 
 use Drupal\Core\Extension\ModuleHandlerInterface;
-use Drupal\Core\Extension\CachedModuleHandlerInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Event\PostResponseEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
@@ -42,9 +41,7 @@ function __construct(ModuleHandlerInterface $module_handler) {
    *   The Event to process.
    */
   public function onTerminate(PostResponseEvent $event) {
-    if ($this->moduleHandler instanceof CachedModuleHandlerInterface) {
-      $this->moduleHandler->writeCache();
-    }
+    $this->moduleHandler->writeCache();
   }
 
   /**

core/lib/Drupal/Core/Extension/CachedModuleHandler.php

-<?php
-
-/**
- * @file
- * Contains Drupal\Core\Extension\CachedModuleHandler.
- */
-
-namespace Drupal\Core\Extension;
-
-use Drupal\Core\Cache\CacheBackendInterface;
-use Drupal\Core\State\StateInterface;
-
-/**
- * Class that manages enabled modules in a Drupal installation.
- */
-class CachedModuleHandler extends ModuleHandler implements CachedModuleHandlerInterface {
-
-  /**
-   * State key/value store.
-   *
-   * @var \Drupal\Core\State\StateInterface
-   */
-  protected $state;
-
-  /**
-   * Cache backend for storing enabled modules.
-   *
-   * @var \Drupal\Core\Cache\CacheBackendInterface
-   */
-  protected $bootstrapCache;
-
-  /**
-   * Whether the cache needs to be written.
-   *
-   * @var boolean
-   */
-  protected $cacheNeedsWriting = FALSE;
-
-  /**
-   * Constructs a new CachedModuleHandler object.
-   */
-  public function __construct(array $module_list = array(), StateInterface $state, CacheBackendInterface $bootstrap_cache) {
-    parent::__construct($module_list);
-    $this->state = $state;
-    $this->bootstrapCache = $bootstrap_cache;
-  }
-
-  /**
-   * Overrides \Drupal\Core\Extension\ModuleHandler::getHookInfo().
-   */
-  public function getHookInfo() {
-    // When this function is indirectly invoked from bootstrap_invoke_all() prior
-    // to all modules being loaded, we do not want to cache an incomplete
-    // hook_hookInfo() result, so instead return an empty array. This requires
-    // bootstrap hook implementations to reside in the .module file, which is
-    // optimal for performance anyway.
-    if (!$this->loaded) {
-      return array();
-    }
-    if (!isset($this->hookInfo)) {
-      if ($cache = $this->bootstrapCache->get('hook_info')) {
-        $this->hookInfo = $cache->data;
-      }
-      else {
-        $this->hookInfo = parent::getHookInfo();
-        $this->bootstrapCache->set('hook_info', $this->hookInfo);
-      }
-    }
-    return $this->hookInfo;
-  }
-
-  /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::resetImplementations().
-   */
-  public function resetImplementations() {
-    // We maintain a persistent cache of hook implementations in addition to the
-    // static cache to avoid looping through every module and every hook on each
-    // request. Benchmarks show that the benefit of this caching outweighs the
-    // additional database hit even when using the default database caching
-    // backend and only a small number of modules are enabled. The cost of the
-    // $this->bootstrapCache->get() is more or less constant and reduced further when
-    // non-database caching backends are used, so there will be more significant
-    // gains when a large number of modules are installed or hooks invoked, since
-    // this can quickly lead to \Drupal::moduleHandler()->implementsHook() being
-    // called several thousand times per request.
-    parent::resetImplementations();
-    $this->bootstrapCache->set('module_implements', array());
-    $this->bootstrapCache->delete('hook_info');
-  }
-
-  /**
-   * Implements \Drupal\Core\Extension\CachedModuleHandlerInterface::writeCache().
-   */
-  public function writeCache() {
-    if ($this->cacheNeedsWriting) {
-      $this->bootstrapCache->set('module_implements', $this->implementations);
-      $this->cacheNeedsWriting = FALSE;
-    }
-  }
-
-  /**
-   * Overrides \Drupal\Core\Extension\ModuleHandler::getImplementationInfo().
-   */
-  protected function getImplementationInfo($hook) {
-    if (!isset($this->implementations)) {
-      $this->implementations = $this->getCachedImplementationInfo();
-    }
-    if (!isset($this->implementations[$hook])) {
-      // The hook is not cached, so ensure that whether or not it has
-      // implementations, the cache is updated at the end of the request.
-      $this->cacheNeedsWriting = TRUE;
-      $this->implementations[$hook] = parent::getImplementationInfo($hook);
-    }
-    else {
-      foreach ($this->implementations[$hook] as $module => $group) {
-        // If this hook implementation is stored in a lazy-loaded file, include
-        // that file first.
-        if ($group) {
-          $this->loadInclude($module, 'inc', "$module.$group");
-        }
-        // It is possible that a module removed a hook implementation without the
-        // implementations cache being rebuilt yet, so we check whether the
-        // function exists on each request to avoid undefined function errors.
-        // Since \Drupal::moduleHandler()->implementsHook() may needlessly try to
-        // load the include file again, function_exists() is used directly here.
-        if (!function_exists($module . '_' . $hook)) {
-          // Clear out the stale implementation from the cache and force a cache
-          // refresh to forget about no longer existing hook implementations.
-          unset($this->implementations[$hook][$module]);
-          $this->cacheNeedsWriting = TRUE;
-        }
-      }
-    }
-    return $this->implementations[$hook];
-  }
-
-  /**
-   * Retrieves hook implementation info from the cache.
-   */
-  protected function getCachedImplementationInfo() {
-    if ($cache = $this->bootstrapCache->get('module_implements')) {
-      return $cache->data;
-    }
-    else {
-      return array();
-    }
-  }
-
-}

core/lib/Drupal/Core/Extension/CachedModuleHandlerInterface.php

-<?php
-
-/**
- * @file
- * Contains Drupal\Core\Extension\CachedModuleHandlerInterface.
- */
-
-namespace Drupal\Core\Extension;
-
-/**
- * Interface for cacheable module handlers.
- */
-interface CachedModuleHandlerInterface extends ModuleHandlerInterface {
-
-  /**
-   * Write the hook implementation info to the cache.
-   */
-  public function writeCache();
-
-}

core/lib/Drupal/Core/Extension/ModuleHandler.php

@@ -55,6 +55,20 @@ class ModuleHandler implements ModuleHandlerInterface {
    */
   protected $hookInfo;
 
+  /**
+   * Cache backend for storing module hook implementation information.
+   *
+   * @var \Drupal\Core\Cache\CacheBackendInterface
+   */
+  protected $cacheBackend;
+
+  /**
+   * Whether the cache needs to be written.
+   *
+   * @var bool
+   */
+  protected $cacheNeedsWriting = FALSE;
+
   /**
    * List of alter hook implementations keyed by hook name(s).
    *
@@ -69,19 +83,22 @@ class ModuleHandler implements ModuleHandlerInterface {
    *   An associative array whose keys are the names of installed modules and
    *   whose values are Extension class parameters. This is normally the
    *   %container.modules% parameter being set up by DrupalKernel.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   Cache backend for storing module hook implementation information.
    *
    * @see \Drupal\Core\DrupalKernel
    * @see \Drupal\Core\CoreServiceProvider
    */
-  public function __construct(array $module_list = array()) {
+  public function __construct(array $module_list = array(), CacheBackendInterface $cache_backend) {
     $this->moduleList = array();
     foreach ($module_list as $name => $module) {
       $this->moduleList[$name] = new Extension($module['type'], $module['pathname'], $module['filename']);
     }
+    $this->cacheBackend = $cache_backend;
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::load().
+   * {@inheritdoc}
    */
   public function load($name) {
     if (isset($this->loadedFiles[$name])) {
@@ -97,7 +114,7 @@ public function load($name) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::loadAll().
+   * {@inheritdoc}
    */
   public function loadAll() {
     if (!$this->loaded) {
@@ -109,7 +126,7 @@ public function loadAll() {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::reload().
+   * {@inheritdoc}
    */
   public function reload() {
     $this->loaded = FALSE;
@@ -117,21 +134,21 @@ public function reload() {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::isLoaded().
+   * {@inheritdoc}
    */
   public function isLoaded() {
     return $this->loaded;
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::getModuleList().
+   * {@inheritdoc}
    */
   public function getModuleList() {
     return $this->moduleList;
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::setModuleList().
+   * {@inheritdoc}
    */
   public function setModuleList(array $module_list = array()) {
     $this->moduleList = $module_list;
@@ -172,7 +189,7 @@ protected function add($type, $name, $path) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::buildModuleDependencies().
+   * {@inheritdoc}
    */
   public function buildModuleDependencies(array $modules) {
     foreach ($modules as $module) {
@@ -195,14 +212,14 @@ public function buildModuleDependencies(array $modules) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::moduleExists().
+   * {@inheritdoc}
    */
   public function moduleExists($module) {
     return isset($this->moduleList[$module]);
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::loadAllIncludes().
+   * {@inheritdoc}
    */
   public function loadAllIncludes($type, $name = NULL) {
     foreach ($this->moduleList as $module => $filename) {
@@ -211,7 +228,7 @@ public function loadAllIncludes($type, $name = NULL) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::loadInclude().
+   * {@inheritdoc}
    */
   public function loadInclude($module, $type, $name = NULL) {
     if ($type == 'install') {
@@ -232,17 +249,31 @@ public function loadInclude($module, $type, $name = NULL) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::getHookInfo().
+   * {@inheritdoc}
    */
   public function getHookInfo() {
-    if (isset($this->hookInfo)) {
-      return $this->hookInfo;
+    if (!isset($this->hookInfo)) {
+      if ($cache = $this->cacheBackend->get('hook_info')) {
+        $this->hookInfo = $cache->data;
+      }
+      else {
+        $this->buildHookInfo();
+        $this->cacheBackend->set('hook_info', $this->hookInfo);
+      }
     }
+    return $this->hookInfo;
+  }
+
+  /**
+   * Builds hook_hook_info() information.
+   *
+   * @see \Drupal\Core\Extension\ModuleHandler::getHookInfo()
+   */
+  protected function buildHookInfo() {
     $this->hookInfo = array();
-    // We can't use $this->invokeAll() here or it would cause an infinite
-    // loop.
     // Make sure that the modules are loaded before checking.
     $this->reload();
+    // $this->invokeAll() would cause an infinite recursion.
     foreach ($this->moduleList as $module => $filename) {
       $function = $module . '_hook_info';
       if (function_exists($function)) {
@@ -252,11 +283,10 @@ public function getHookInfo() {
         }
       }
     }
-    return $this->hookInfo;
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::getImplementations().
+   * {@inheritdoc}
    */
   public function getImplementations($hook) {
     $implementations = $this->getImplementationInfo($hook);
@@ -264,16 +294,39 @@ public function getImplementations($hook) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::resetImplementations().
+   * {@inheritdoc}
+   */
+  public function writeCache() {
+    if ($this->cacheNeedsWriting) {
+      $this->cacheBackend->set('module_implements', $this->implementations);
+      $this->cacheNeedsWriting = FALSE;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
    */
   public function resetImplementations() {
     $this->implementations = NULL;
     $this->hookInfo = NULL;
     $this->alterFunctions = NULL;
+    // We maintain a persistent cache of hook implementations in addition to the
+    // static cache to avoid looping through every module and every hook on each
+    // request. Benchmarks show that the benefit of this caching outweighs the
+    // additional database hit even when using the default database caching
+    // backend and only a small number of modules are enabled. The cost of the
+    // $this->cacheBackend->get() is more or less constant and reduced further
+    // when non-database caching backends are used, so there will be more
+    // significant gains when a large number of modules are installed or hooks
+    // invoked, since this can quickly lead to
+    // \Drupal::moduleHandler()->implementsHook() being called several thousand
+    // times per request.
+    $this->cacheBackend->set('module_implements', array());
+    $this->cacheBackend->delete('hook_info');
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::implementsHook().
+   * {@inheritdoc}
    */
   public function implementsHook($module, $hook) {
     $function = $module . '_' . $hook;
@@ -293,7 +346,7 @@ public function implementsHook($module, $hook) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::invoke().
+   * {@inheritdoc}
    */
   public function invoke($module, $hook, array $args = array()) {
     if (!$this->implementsHook($module, $hook)) {
@@ -304,7 +357,7 @@ public function invoke($module, $hook, array $args = array()) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::invokeAll().
+   * {@inheritdoc}
    */
   public function invokeAll($hook, array $args = array()) {
     $return = array();
@@ -326,7 +379,7 @@ public function invokeAll($hook, array $args = array()) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::alter().
+   * {@inheritdoc}
    */
   public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL) {
     // Most of the time, $type is passed as a string, so for performance,
@@ -338,8 +391,8 @@ public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL) {
       $extra_types = $type;
       $type = array_shift($extra_types);
       // Allow if statements in this function to use the faster isset() rather
-      // than !empty() both when $type is passed as a string, or as an array with
-      // one item.
+      // than !empty() both when $type is passed as a string, or as an array
+      // with one item.
       if (empty($extra_types)) {
         unset($extra_types);
       }
@@ -357,8 +410,8 @@ public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL) {
       $modules = $this->getImplementations($hook);
       if (!isset($extra_types)) {
         // For the more common case of a single hook, we do not need to call
-        // function_exists(), since $this->getImplementations() returns only modules with
-        // implementations.
+        // function_exists(), since $this->getImplementations() returns only
+        // modules with implementations.
         foreach ($modules as $module) {
           $this->alterFunctions[$cid][] = $module . '_' . $hook;
         }
@@ -372,22 +425,24 @@ public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL) {
         }
         // If any modules implement one of the extra hooks that do not implement
         // the primary hook, we need to add them to the $modules array in their
-        // appropriate order. $this->getImplementations() can only return ordered
-        // implementations of a single hook. To get the ordered implementations
-        // of multiple hooks, we mimic the $this->getImplementations() logic of first
-        // ordering by $this->getModuleList(), and then calling
+        // appropriate order. $this->getImplementations() can only return
+        // ordered implementations of a single hook. To get the ordered
+        // implementations of multiple hooks, we mimic the
+        // $this->getImplementations() logic of first ordering by
+        // $this->getModuleList(), and then calling
         // $this->alter('module_implements').
         if (array_diff($extra_modules, $modules)) {
           // Merge the arrays and order by getModuleList().
           $modules = array_intersect(array_keys($this->moduleList), array_merge($modules, $extra_modules));
-          // Since $this->getImplementations() already took care of loading the necessary
-          // include files, we can safely pass FALSE for the array values.
+          // Since $this->getImplementations() already took care of loading the
+          // necessary include files, we can safely pass FALSE for the array
+          // values.
           $implementations = array_fill_keys($modules, FALSE);
           // Let modules adjust the order solely based on the primary hook. This
           // ensures the same module order regardless of whether this if block
-          // runs. Calling $this->alter() recursively in this way does not result
-          // in an infinite loop, because this call is for a single $type, so we
-          // won't end up in this code block again.
+          // runs. Calling $this->alter() recursively in this way does not
+          // result in an infinite loop, because this call is for a single
+          // $type, so we won't end up in this code block again.
           $this->alter('module_implements', $implementations, $hook);
           $modules = array_keys($implementations);
         }
@@ -450,9 +505,55 @@ public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL) {
    *   hook_hook_info() or FALSE if the implementation is in the module file.
    */
   protected function getImplementationInfo($hook) {
-    if (isset($this->implementations[$hook])) {
-      return $this->implementations[$hook];
+    if (!isset($this->implementations)) {
+      $this->implementations = array();
+      if ($cache = $this->cacheBackend->get('module_implements')) {
+        $this->implementations = $cache->data;
+      }
+    }
+    if (!isset($this->implementations[$hook])) {
+      // The hook is not cached, so ensure that whether or not it has
+      // implementations, the cache is updated at the end of the request.
+      $this->cacheNeedsWriting = TRUE;
+      $this->implementations[$hook] = $this->buildImplementationInfo($hook);
     }
+    else {
+      foreach ($this->implementations[$hook] as $module => $group) {
+        // If this hook implementation is stored in a lazy-loaded file, include
+        // that file first.
+        if ($group) {
+          $this->loadInclude($module, 'inc', "$module.$group");
+        }
+        // It is possible that a module removed a hook implementation without
+        // the implementations cache being rebuilt yet, so we check whether the
+        // function exists on each request to avoid undefined function errors.
+        // Since ModuleHandler::implementsHook() may needlessly try to
+        // load the include file again, function_exists() is used directly here.
+        if (!function_exists($module . '_' . $hook)) {
+          // Clear out the stale implementation from the cache and force a cache
+          // refresh to forget about no longer existing hook implementations.
+          unset($this->implementations[$hook][$module]);
+          $this->cacheNeedsWriting = TRUE;
+        }
+      }
+    }
+    return $this->implementations[$hook];
+  }
+
+  /**
+   * Builds hook implementation information for a given hook name.
+   *
+   * @param string $hook
+   *   The name of the hook (e.g. "help" or "menu").
+   *
+   * @return array
+   *   An array whose keys are the names of the modules which are implementing
+   *   this hook and whose values are either an array of information from
+   *   hook_hook_info() or FALSE if the implementation is in the module file.
+   *
+   * @see \Drupal\Core\Extension\ModuleHandler::getImplementationInfo()
+   */
+  protected function buildImplementationInfo($hook) {
     $this->implementations[$hook] = array();
     $hook_info = $this->getHookInfo();
     foreach ($this->moduleList as $module => $filename) {
@@ -552,8 +653,8 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
 
       // Conditionally add the dependencies to the list of modules.
       if ($enable_dependencies) {
-        // Add dependencies to the list. The new modules will be processed as the
-        // while loop continues.
+        // Add dependencies to the list. The new modules will be processed as
+        // the while loop continues.
         while (list($module) = each($module_list)) {
           foreach (array_keys($module_data[$module]->requires) as $dependency) {
             if (!isset($module_data[$dependency])) {
@@ -606,14 +707,15 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
           ->save();
 
         // Prepare the new module list, sorted by weight, including filenames.
-        // This list is used for both the ModuleHandler and DrupalKernel. It needs
-        // to be kept in sync between both. A DrupalKernel reboot or rebuild will
-        // automatically re-instantiate a new ModuleHandler that uses the new
-        // module list of the kernel. However, DrupalKernel does not cause any
-        // modules to be loaded.
-        // Furthermore, the currently active (fixed) module list can be different
-        // from the configured list of enabled modules. For all active modules not
-        // contained in the configured enabled modules, we assume a weight of 0.
+        // This list is used for both the ModuleHandler and DrupalKernel. It
+        // needs to be kept in sync between both. A DrupalKernel reboot or
+        // rebuild will automatically re-instantiate a new ModuleHandler that
+        // uses the new module list of the kernel. However, DrupalKernel does
+        // not cause any modules to be loaded.
+        // Furthermore, the currently active (fixed) module list can be
+        // different from the configured list of enabled modules. For all active
+        // modules not contained in the configured enabled modules, we assume a
+        // weight of 0.
         $current_module_filenames = $this->getModuleList();
         $current_modules = array_fill_keys(array_keys($current_module_filenames), 0);
         $current_modules = module_config_sort(array_merge($current_modules, $extension_config->get('module')));
@@ -631,10 +733,10 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
         }
 
         // Update the module handler in order to load the module's code.
-        // This allows the module to participate in hooks and its existence to be
-        // discovered by other modules.
-        // The current ModuleHandler instance is obsolete with the kernel rebuild
-        // below.
+        // This allows the module to participate in hooks and its existence to
+        // be discovered by other modules.
+        // The current ModuleHandler instance is obsolete with the kernel
+        // rebuild below.
         $this->setModuleList($module_filenames);
         $this->load($module);
         module_load_install($module);
@@ -647,8 +749,8 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
         // Update the kernel to include it.
         // This reboots the kernel to register the module's bundle and its
         // services in the service container. The $module_filenames argument is
-        // taken over as %container.modules% parameter, which is passed to a fresh
-        // ModuleHandler instance upon first retrieval.
+        // taken over as %container.modules% parameter, which is passed to a
+        // fresh ModuleHandler instance upon first retrieval.
         // @todo install_begin_request() creates a container without a kernel.
         if ($kernel = \Drupal::service('kernel', ContainerInterface::NULL_ON_INVALID_REFERENCE)) {
           $kernel->updateModules($module_filenames, $module_filenames);

core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php

@@ -174,6 +174,11 @@ public function getHookInfo();
    */
   public function getImplementations($hook);
 
+  /**
+   * Write the hook implementation info to the cache.
+   */
+  public function writeCache();
+
   /**
    * Resets the cached list of hook implementations.
    */

core/modules/system/lib/Drupal/system/Tests/Plugin/PluginTestBase.php

@@ -11,6 +11,7 @@
 use Drupal\plugin_test\Plugin\TestPluginManager;
 use Drupal\plugin_test\Plugin\MockBlockManager;
 use Drupal\plugin_test\Plugin\DefaultsTestPluginManager;
+use Drupal\Core\Cache\MemoryBackend;
 use Drupal\Core\Extension\ModuleHandler;
 
 /**
@@ -37,7 +38,7 @@ public function setUp() {
     //   as derivatives and ReflectionFactory.
     $this->testPluginManager = new TestPluginManager();
     $this->mockBlockManager = new MockBlockManager();
-    $module_handler = new ModuleHandler();
+    $module_handler = new ModuleHandler(array(), new MemoryBackend('plugin'));
     $this->defaultsTestPluginManager = new DefaultsTestPluginManager($module_handler);
 
     // The expected plugin definitions within each manager. Several tests assert

core/tests/Drupal/Tests/Core/Extension/ModuleHandlerUnitTest.php

-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Extension\ModuleHanderUnitTest.
- */
-
-namespace Drupal\Tests\Core\Extension;
-
-use Drupal\Core\Extension\ModuleHandler;
-use Drupal\Tests\UnitTestCase;
-use PHPUnit_Framework_Error_Notice;
-
-/**
- * Tests the ModuleHandler class.
- *
- * @group System
- */
-class ModuleHandlerUnitTest extends UnitTestCase {
-
-  public static function getInfo() {
-    return array(
-      'name' => 'ModuleHandler functionality',
-      'description' => 'Tests the ModuleHandler class.',
-      'group' => 'System',
-    );
-  }
-
-  function setUp() {
-    parent::setUp();
-    $this->moduleHandler = new ModuleHandler;
-  }
-
-  /**
-   * Tests loading of an include from a nonexistent module.
-   */
-  public function testLoadInclude() {
-    // Attepmting to load a file from a non-existent module should return FALSE.
-    $this->assertFalse($this->moduleHandler->loadInclude('foo', 'inc'));
-  }
-
-}

core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php

@@ -105,7 +105,9 @@ public function testDefaultPluginManager() {
    * Tests the plugin manager with no cache and altering.
    */
   public function testDefaultPluginManagerWithAlter() {
-    $module_handler = $this->getMock('Drupal\Core\Extension\ModuleHandler');
+    $module_handler = $this->getMockBuilder('Drupal\Core\Extension\ModuleHandler')
+      ->disableOriginalConstructor()
+      ->getMock();
 
     // Configure the stub.
     $alter_hook_name = $this->randomName();