diff -u b/core/lib/Drupal/Core/Config/Schema/ArrayElement.php b/core/lib/Drupal/Core/Config/Schema/ArrayElement.php
--- b/core/lib/Drupal/Core/Config/Schema/ArrayElement.php
+++ b/core/lib/Drupal/Core/Config/Schema/ArrayElement.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\Schema\ArrayElement.
+ * Contains \Drupal\Core\Config\Schema\ArrayElement.
  */
 
 namespace Drupal\Core\Config\Schema;
diff -u b/core/lib/Drupal/Core/Config/Schema/Element.php b/core/lib/Drupal/Core/Config/Schema/Element.php
--- b/core/lib/Drupal/Core/Config/Schema/Element.php
+++ b/core/lib/Drupal/Core/Config/Schema/Element.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\Schema\Element.
+ * Contains \Drupal\Core\Config\Schema\Element.
  */
 
 namespace Drupal\Core\Config\Schema;
diff -u b/core/lib/Drupal/Core/Config/Schema/Mapping.php b/core/lib/Drupal/Core/Config/Schema/Mapping.php
--- b/core/lib/Drupal/Core/Config/Schema/Mapping.php
+++ b/core/lib/Drupal/Core/Config/Schema/Mapping.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\Schema\Mapping.
+ * Contains \Drupal\Core\Config\Schema\Mapping.
  */
 
 namespace Drupal\Core\Config\Schema;
diff -u b/core/lib/Drupal/Core/Config/Schema/Parser.php b/core/lib/Drupal/Core/Config/Schema/Parser.php
--- b/core/lib/Drupal/Core/Config/Schema/Parser.php
+++ b/core/lib/Drupal/Core/Config/Schema/Parser.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\Schema\Parser.
+ * Contains \Drupal\Core\Config\Schema\Parser.
  */
 
 namespace Drupal\Core\Config\Schema;
diff -u b/core/lib/Drupal/Core/Config/Schema/Property.php b/core/lib/Drupal/Core/Config/Schema/Property.php
--- b/core/lib/Drupal/Core/Config/Schema/Property.php
+++ b/core/lib/Drupal/Core/Config/Schema/Property.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\Schema\Sequence.
+ * Contains \Drupal\Core\Config\Schema\Sequence.
  */
 
 namespace Drupal\Core\Config\Schema;
diff -u b/core/lib/Drupal/Core/Config/Schema/SchemaDiscovery.php b/core/lib/Drupal/Core/Config/Schema/SchemaDiscovery.php
--- b/core/lib/Drupal/Core/Config/Schema/SchemaDiscovery.php
+++ b/core/lib/Drupal/Core/Config/Schema/SchemaDiscovery.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Config\Schema\SchemaDiscovery.
+ * Contains \Drupal\Config\Schema\SchemaDiscovery.
  */
 
 namespace Drupal\Core\Config\Schema;
diff -u b/core/lib/Drupal/Core/Config/Schema/Sequence.php b/core/lib/Drupal/Core/Config/Schema/Sequence.php
--- b/core/lib/Drupal/Core/Config/Schema/Sequence.php
+++ b/core/lib/Drupal/Core/Config/Schema/Sequence.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\Schema\Sequence.
+ * Contains \Drupal\Core\Config\Schema\Sequence.
  */
 
 namespace Drupal\Core\Config\Schema;
diff -u b/core/lib/Drupal/Core/Config/TypedConfigElementFactory.php b/core/lib/Drupal/Core/Config/TypedConfigElementFactory.php
--- b/core/lib/Drupal/Core/Config/TypedConfigElementFactory.php
+++ b/core/lib/Drupal/Core/Config/TypedConfigElementFactory.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\TypedConfigElementFactory.
+ * Contains \Drupal\Core\Config\TypedConfigElementFactory.
  */
 
 namespace Drupal\Core\Config;
diff -u b/core/lib/Drupal/Core/Config/TypedConfigManager.php b/core/lib/Drupal/Core/Config/TypedConfigManager.php
--- b/core/lib/Drupal/Core/Config/TypedConfigManager.php
+++ b/core/lib/Drupal/Core/Config/TypedConfigManager.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Config\TypedConfigManager.
+ * Contains \Drupal\Core\Config\TypedConfigManager.
  */
 
 namespace Drupal\Core\Config;
diff -u b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php
--- b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php
@@ -2,25 +2,25 @@
 
 /**
  * @file
- * Definition of Drupal\config\Tests\ConfigMetadataTest.
+ * Contains \Drupal\config\Tests\ConfigSchemaTest.
  */
 
 namespace Drupal\config\Tests;
 
 use Drupal\Core\Config\TypedConfig;
-use Drupal\simpletest\WebTestBase;
+use Drupal\simpletest\DrupalUnitTestBase;
 
 /**
  * Tests schema for configuration objects.
  */
-class ConfigSchemaTest extends WebTestBase {
+class ConfigSchemaTest extends DrupalUnitTestBase {
 
   /**
    * Modules to enable.
    *
    * @var array
    */
-  public static $modules = array('locale', 'image');
+  public static $modules = array('system', 'locale', 'image');
 
   public static function getInfo() {
     return array(
@@ -30,6 +30,12 @@
     );
   }
 
+  public function setUp() {
+    parent::setUp();
+    config_install_default_config('module', 'system');
+    config_install_default_config('module', 'image');
+  }
+
   /**
    * Tests the basic metadata retrieval layer.
    */
@@ -141 +146,0 @@
-
diff -u b/core/modules/contact/config/contact.schema.yml b/core/modules/contact/config/contact.schema.yml
--- b/core/modules/contact/config/contact.schema.yml
+++ b/core/modules/contact/config/contact.schema.yml
@@ -16,7 +16,7 @@
       type: string
     "weight":
       type: integer
-      
+
 # Module settings
 contact.settings:
   type: mapping
diff -u b/core/modules/image/config/image.schema.yml b/core/modules/image/config/image.schema.yml
--- b/core/modules/image/config/image.schema.yml
+++ b/core/modules/image/config/image.schema.yml
@@ -43,11 +43,11 @@
   mapping:
     "anchor":
       label: "Anchor"
-      
+
 image.effect.image_resize:
   type: image.size
   label: "Image resize"
-  
+
 image.effect.image_rotate:
   type: mapping
   label: "Image rotate"
diff -u b/core/modules/system/config/system.schema.yml b/core/modules/system/config/system.schema.yml
--- b/core/modules/system/config/system.schema.yml
+++ b/core/modules/system/config/system.schema.yml
@@ -51,7 +51,7 @@
 # Complex extended data types:
 
 # Mail text with subject and body parts.
-mail:  
+mail:
   type: mapping
   label: "Mail"
   mapping:
@@ -61,7 +61,7 @@
     "body":
       type: text
       label: "Body"
-  
+
 # Schema for configuration files of system module:
 
 system.site:
@@ -105 +104,0 @@
-      
\ No newline at end of file
diff -u b/core/modules/views/config/views.schema.yml b/core/modules/views/config/views.schema.yml
--- b/core/modules/views/config/views.schema.yml
+++ b/core/modules/views/config/views.schema.yml
@@ -27,14 +27,14 @@
     core:
       label: 'Drupal version'
     uuid:
-      label: 'UUID' 
+      label: 'UUID'
     display:
       type: sequence
       label: 'Displays'
       sequence:
         - type: mapping
           label: 'Display settings'
-          mapping:      
+          mapping:
             id:
               label: 'Machine name'
             display_title:
@@ -77,13 +77,13 @@
             offset:
               type: integer
               label: 'Offset'
-  
+
     exposed_form:
       type: mapping
       label: 'Exposed form'
       mapping:
         type:
-          label: 'Exposed form type'   
+          label: 'Exposed form type'
     access:
       type: mapping
       label: 'Access'
@@ -102,7 +102,7 @@
       type: sequence
       label: 'Sorts'
       sequence:
-        - type: 'views.sort.[table]-[field]'    
+        - type: 'views.sort.[table]-[field]'
     arguments:
       type: sequence
       label: 'Arguments'
@@ -156,7 +156,7 @@
       type: sequence
       label: 'Relationships'
       sequence:
-        - type: 'views.relationship.[table]-[field]'  
+        - type: 'views.relationship.[table]-[field]'
 
 # Options for Drupal\views\Plugin\views\display\PathPluginBase
 views.display.PathPluginBase:
@@ -208,7 +208,7 @@
           label: 'Weight'
         name:
           label: 'Menu name'
- 
+
 # Views display plugin: Drupal\views\Plugin\views\display\Block
 views.display.block:
   type: 'views.display.%'
@@ -219,7 +219,7 @@
       label: 'Block name'
     block_caching:
       label: 'Block caching'
- 
+
 # Views display plugin: Drupal\views\Plugin\views\display\Feed
 views.display.feed:
   type: 'views.display.PathPluginBase'