Issue #2338747 by dawehner, chx: Move {router} out of system.install and create the table lazy

core/lib/Drupal/Core/Routing/MatcherDumper.php

@@ -7,6 +7,8 @@
 
 namespace Drupal\Core\Routing;
 
+use Drupal\Core\Database\Query\Query;
+use Drupal\Core\Database\SchemaObjectExistsException;
 use Drupal\Core\State\StateInterface;
 use Symfony\Component\Routing\RouteCollection;
 
@@ -14,6 +16,8 @@
 
 /**
  * Dumps Route information to a database table.
+ *
+ * @see \Drupal\Core\Routing\RouteProvider
  */
 class MatcherDumper implements MatcherDumperInterface {
 
@@ -97,7 +101,13 @@ public function dump(array $options = array()) {
     try {
       // We don't use truncate, because it is not guaranteed to be transaction
       // safe.
-      $this->connection->delete($this->tableName)->execute();
+      try {
+        $this->connection->delete($this->tableName)
+          ->execute();
+      }
+      catch (\Exception $e) {
+        $this->ensureTableExists();
+      }
 
       // Split the routes into chunks to avoid big INSERT queries.
       $route_chunks = array_chunk($this->routes->all(), 50, TRUE);
@@ -162,4 +172,85 @@ public function getRoutes() {
     return $this->routes;
   }
 
+  /**
+   * Checks if the tree table exists and create it if not.
+   *
+   * @return bool
+   *   TRUE if the table was created, FALSE otherwise.
+   */
+  protected function ensureTableExists() {
+    try {
+      if (!$this->connection->schema()->tableExists($this->tableName)) {
+        $this->connection->schema()->createTable($this->tableName, $this->schemaDefinition());
+        return TRUE;
+      }
+    }
+    catch (SchemaObjectExistsException $e) {
+      // If another process has already created the config table, attempting to
+      // recreate it will throw an exception. In this case just catch the
+      // exception and do nothing.
+      return TRUE;
+    }
+    return FALSE;
+  }
+
+  /**
+   * Defines the schema for the router table.
+   *
+   * @return array
+   *   The schema API definition for the SQL storage table.
+   */
+  protected function schemaDefinition() {
+    $schema = [
+      'description' => 'Maps paths to various callbacks (access, page and title)',
+      'fields' => [
+        'name' => [
+          'description' => 'Primary Key: Machine name of this route',
+          'type' => 'varchar_ascii',
+          'length' => 255,
+          'not null' => TRUE,
+          'default' => '',
+        ],
+        'path' => [
+          'description' => 'The path for this URI',
+          'type' => 'varchar',
+          'length' => 255,
+          'not null' => TRUE,
+          'default' => '',
+        ],
+        'pattern_outline' => [
+          'description' => 'The pattern',
+          'type' => 'varchar',
+          'length' => 255,
+          'not null' => TRUE,
+          'default' => '',
+        ],
+        'fit' => [
+          'description' => 'A numeric representation of how specific the path is.',
+          'type' => 'int',
+          'not null' => TRUE,
+          'default' => 0,
+        ],
+        'route' => [
+          'description' => 'A serialized Route object',
+          'type' => 'blob',
+          'size' => 'big',
+        ],
+        'number_parts' => [
+          'description' => 'Number of parts in this router path.',
+          'type' => 'int',
+          'not null' => TRUE,
+          'default' => 0,
+          'size' => 'small',
+        ],
+      ],
+      'indexes' => [
+        'pattern_outline_parts' => ['pattern_outline', 'number_parts'],
+      ],
+      'primary key' => ['name'],
+    ];
+
+    return $schema;
+  }
+
 }

core/lib/Drupal/Core/Routing/RouteProvider.php

@@ -210,7 +210,12 @@ public function preLoadRoutes($names) {
         $routes = $cache->data;
       }
       else {
-        $result = $this->connection->query('SELECT name, route FROM {' . $this->connection->escapeTable($this->tableName) . '} WHERE name IN ( :names[] )', array(':names[]' => $routes_to_load));
+        try {
+          $result = $this->connection->query('SELECT name, route FROM {' . $this->connection->escapeTable($this->tableName) . '} WHERE name IN ( :names[] )', array(':names[]' => $routes_to_load));
+        }
+        catch (\Exception $e) {
+          $result = [];
+        }
         $routes = $result->fetchAllKeyed();
 
         $this->cache->set($cid, $routes, Cache::PERMANENT, ['routes']);
@@ -336,10 +341,15 @@ protected function getRoutesByPath($path) {
     // The >= check on number_parts allows us to match routes with optional
     // trailing wildcard parts as long as the pattern matches, since we
     // dump the route pattern without those optional parts.
-    $routes = $this->connection->query("SELECT name, route, fit FROM {" . $this->connection->escapeTable($this->tableName) . "} WHERE pattern_outline IN ( :patterns[] ) AND number_parts >= :count_parts", array(
-      ':patterns[]' => $ancestors, ':count_parts' => count($parts),
-    ))
-      ->fetchAll(\PDO::FETCH_ASSOC);
+    try {
+      $routes = $this->connection->query("SELECT name, route, fit FROM {" . $this->connection->escapeTable($this->tableName) . "} WHERE pattern_outline IN ( :patterns[] ) AND number_parts >= :count_parts", array(
+        ':patterns[]' => $ancestors, ':count_parts' => count($parts),
+      ))
+        ->fetchAll(\PDO::FETCH_ASSOC);
+    }
+    catch (\Exception $e) {
+      $routes = [];
+    }
 
     // We sort by fit and name in PHP to avoid a SQL filesort.
     usort($routes, array($this, 'routeProviderRouteCompare'));

core/modules/breakpoint/src/Tests/BreakpointDiscoveryTest.php

@@ -24,7 +24,6 @@ class BreakpointDiscoveryTest extends KernelTestBase {
 
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router'));
     \Drupal::service('theme_handler')->install(array('breakpoint_theme_test'));
   }
 

core/modules/comment/src/Tests/CommentDefaultFormatterCacheTagsTest.php

@@ -59,7 +59,6 @@ protected function setUp() {
     $this->installConfig(array('system', 'filter', 'comment'));
 
     // Comment rendering generates links, so build the router.
-    $this->installSchema('system', array('router'));
     $this->container->get('router.builder')->rebuild();
 
     // Set up a field, so that the entity that'll be referenced bubbles up a

core/modules/comment/src/Tests/Migrate/d6/MigrateCommentTest.php

@@ -33,7 +33,6 @@ protected function setUp() {
     $this->installEntitySchema('node');
     $this->installEntitySchema('comment');
     $this->installSchema('comment', ['comment_entity_statistics']);
-    $this->installSchema('system', ['router']);
     $this->installConfig(['comment']);
 
     // The entity.node.canonical route must exist when the RDF hook is called.

core/modules/config/src/Tests/ConfigInstallTest.php

@@ -30,7 +30,6 @@ class ConfigInstallTest extends KernelTestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', ['router']);
 
     // Ensure the global variable being asserted by this test does not exist;
     // a previous test executed in this request/process might have set it.

core/modules/editor/src/Tests/EditorImageDialogTest.php

@@ -41,7 +41,7 @@ class EditorImageDialogTest extends EntityUnitTestBase {
   protected function setUp() {
     parent::setUp();
     $this->installEntitySchema('file');
-    $this->installSchema('system', ['router', 'key_value_expire']);
+    $this->installSchema('system', ['key_value_expire']);
     $this->installSchema('node', array('node_access'));
     $this->installSchema('file', array('file_usage'));
     $this->installConfig(['node']);

core/modules/field/src/Tests/EntityReference/EntityReferenceFormatterTest.php

@@ -77,7 +77,6 @@ protected function setUp() {
       ->save();
 
     // The label formatter rendering generates links, so build the router.
-    $this->installSchema('system', 'router');
     $this->container->get('router.builder')->rebuild();
 
     $this->createEntityReferenceField($this->entityType, $this->bundle, $this->fieldName, 'Field test', $this->entityType, 'default', array(), FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);

core/modules/field/src/Tests/FieldImportDeleteUninstallTest.php

@@ -29,7 +29,7 @@ class FieldImportDeleteUninstallTest extends FieldUnitTestBase {
 
   protected function setUp() {
     parent::setUp();
-    // Module uninstall requires the router and users_data tables.
+    // Module uninstall requires users_data tables.
     // @see drupal_flush_all_caches()
     // @see user_modules_uninstalled()
     $this->installSchema('user', array('users_data'));

core/modules/field/src/Tests/FieldUnitTestBase.php

@@ -52,7 +52,7 @@ protected function setUp() {
 
     $this->installEntitySchema('entity_test');
     $this->installEntitySchema('user');
-    $this->installSchema('system', ['router', 'sequences', 'key_value']);
+    $this->installSchema('system', ['sequences', 'key_value']);
 
     // Set default storage backend and configure the theme system.
     $this->installConfig(array('field', 'system'));

core/modules/field/src/Tests/String/RawStringFormatterTest.php

@@ -58,7 +58,6 @@ protected function setUp() {
 
     // Configure the theme system.
     $this->installConfig(array('system', 'field'));
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
     $this->installEntitySchema('entity_test');
 

core/modules/field/src/Tests/String/StringFormatterTest.php

@@ -58,7 +58,6 @@ protected function setUp() {
 
     // Configure the theme system.
     $this->installConfig(array('system', 'field'));
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
     $this->installEntitySchema('entity_test_rev');
 

core/modules/field/src/Tests/String/UuidFormatterTest.php

@@ -32,7 +32,6 @@ protected function setUp() {
     parent::setUp();
 
     $this->installConfig(['system', 'field']);
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
     $this->installEntitySchema('entity_test');
   }

core/modules/filter/src/Tests/TextFormatElementFormTest.php

@@ -41,7 +41,7 @@ class TextFormatElementFormTest extends KernelTestBase implements FormInterface
   protected function setUp() {
     parent::setUp();
     $this->installEntitySchema('user');
-    $this->installSchema('system', ['sequences', 'router']);
+    $this->installSchema('system', ['sequences']);
     $this->installConfig(['filter', 'filter_test']);
     // Filter tips link to the full-page.
     \Drupal::service('router.builder')->rebuild();

core/modules/hal/src/Tests/NormalizerTestBase.php

@@ -63,7 +63,6 @@ abstract class NormalizerTestBase extends KernelTestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router'));
     $this->installEntitySchema('user');
     $this->installEntitySchema('entity_test');
     // If the concrete test sub-class installs the Node or Comment modules,

core/modules/help/src/Tests/HelpEmptyPageTest.php

@@ -24,15 +24,6 @@ class HelpEmptyPageTest extends KernelTestBase {
    */
   public static $modules = ['system', 'help_test', 'user'];
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-
-    $this->installSchema('system', 'router');
-  }
-
   /**
    * {@inheritdoc}
    */

core/modules/language/src/Tests/EntityUrlLanguageTest.php

@@ -41,7 +41,6 @@ protected function setUp() {
 
     $this->installEntitySchema('entity_test');
     $this->installEntitySchema('configurable_language');
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
 
     // In order to reflect the changes for a multilingual site in the container

core/modules/menu_link_content/src/Tests/MenuLinkContentCacheabilityBubblingTest.php

@@ -39,7 +39,6 @@ protected function setUp() {
 
     $this->installEntitySchema('menu_link_content');
     $this->installEntitySchema('user');
-    $this->installSchema('system', ['router']);
 
     // Ensure that the weight of module_link_content is higher than system.
     // @see menu_link_content_install()

core/modules/menu_link_content/src/Tests/MenuLinkContentDeriverTest.php

@@ -33,7 +33,6 @@ protected function setUp() {
     parent::setUp();
 
     $this->installEntitySchema('menu_link_content');
-    $this->installSchema('system', 'router');
   }
 
   /**

core/modules/menu_link_content/src/Tests/Migrate/d6/MigrateMenuLinkTest.php

@@ -27,7 +27,6 @@ class MigrateMenuLinkTest extends MigrateDrupal6TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', ['router']);
     $this->installEntitySchema('menu_link_content');
     $this->executeMigrations(['menu', 'menu_links']);
   }

core/modules/menu_link_content/src/Tests/Migrate/d7/MigrateMenuLinkTest.php

@@ -32,7 +32,6 @@ class MigrateMenuLinkTest extends MigrateDrupal7TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', ['router']);
     $this->installEntitySchema('menu_link_content');
     $this->executeMigration('menu');
     \Drupal::service('router.builder')->rebuild();

core/modules/menu_link_content/src/Tests/PathAliasMenuLinkContentTest.php

@@ -32,7 +32,6 @@ protected function setUp() {
     parent::setUp();
 
     $this->installEntitySchema('menu_link_content');
-    $this->installSchema('system', ['router']);
 
     // Ensure that the weight of module_link_content is higher than system.
     // @see menu_link_content_install()

core/modules/node/src/Tests/NodeBodyFieldStorageTest.php

@@ -29,7 +29,6 @@ class NodeBodyFieldStorageTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
     $this->installSchema('system', 'sequences');
-    $this->installSchema('system', array('router'));
     // Necessary for module uninstall.
     $this->installSchema('user', 'users_data');
     $this->installEntitySchema('user');

core/modules/path/tests/src/Kernel/PathNoCanonicalLinkTest.php

@@ -30,7 +30,6 @@ protected function setUp() {
 
     $this->installEntitySchema('entity_test');
     $this->installEntitySchema('entity_test_mul');
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
 
     // Adding german language.

core/modules/rest/src/Tests/RestLinkManagerTest.php

@@ -25,7 +25,6 @@ class RestLinkManagerTest extends KernelTestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', ['router']);
     \Drupal::service('router.builder')->rebuild();
   }
 

core/modules/serialization/src/Tests/NormalizerTestBase.php

@@ -25,7 +25,6 @@ protected function setUp() {
 
     $this->installEntitySchema('entity_test_mulrev');
     $this->installEntitySchema('user');
-    $this->installSchema('system', array('router'));
     $this->installConfig(array('field'));
     \Drupal::service('router.builder')->rebuild();
     \Drupal::moduleHandler()->invoke('rest', 'install');

core/modules/shortcut/src/Tests/Migrate/d7/MigrateShortcutSetTest.php

@@ -35,7 +35,6 @@ class MigrateShortcutSetTest extends MigrateDrupal7TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router'));
     $this->installEntitySchema('shortcut');
     $this->installEntitySchema('menu_link_content');
     \Drupal::service('router.builder')->rebuild();

core/modules/shortcut/src/Tests/Migrate/d7/MigrateShortcutSetUsersTest.php

@@ -34,7 +34,6 @@ class MigrateShortcutSetUsersTest extends MigrateDrupal7TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router'));
     $this->installEntitySchema('shortcut');
     $this->installEntitySchema('menu_link_content');
     $this->installSchema('shortcut', ['shortcut_set_users']);

core/modules/shortcut/src/Tests/Migrate/d7/MigrateShortcutTest.php

@@ -35,7 +35,6 @@ class MigrateShortcutTest extends MigrateDrupal7TestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router'));
     $this->installEntitySchema('shortcut');
     $this->installEntitySchema('menu_link_content');
     \Drupal::service('router.builder')->rebuild();

core/modules/system/src/Tests/Block/SystemMenuBlockTest.php

@@ -87,7 +87,6 @@ protected function setUp() {
     parent::setUp();
     $this->installSchema('system', 'sequences');
     $this->installEntitySchema('user');
-    $this->installSchema('system', array('router'));
     $this->installEntitySchema('menu_link_content');
 
     $account = User::create([

core/modules/system/src/Tests/Common/AttachedAssetsTest.php

@@ -51,7 +51,6 @@ class AttachedAssetsTest extends KernelTestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router'));
     $this->container->get('router.builder')->rebuild();
 
     $this->assetResolver = $this->container->get('asset.resolver');

core/modules/system/src/Tests/Common/PageRenderTest.php

@@ -21,7 +21,6 @@ class PageRenderTest extends KernelTestBase {
    */
   function testHookPageAttachmentsExceptions() {
     $this->enableModules(['common_test', 'system']);
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
 
     $this->assertPageRenderHookExceptions('common_test', 'hook_page_attachments');
@@ -32,7 +31,6 @@ function testHookPageAttachmentsExceptions() {
    */
   function testHookPageAlter() {
     $this->enableModules(['common_test', 'system']);
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
 
     $this->assertPageRenderHookExceptions('common_test', 'hook_page_attachments_alter');

core/modules/system/src/Tests/Common/RenderElementTypesTest.php

@@ -28,7 +28,6 @@ class RenderElementTypesTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
     $this->installConfig(array('system'));
-    $this->installSchema('system', array('router'));
     \Drupal::service('router.builder')->rebuild();
   }
 

core/modules/system/src/Tests/Condition/CurrentThemeConditionTest.php

@@ -22,14 +22,6 @@ class CurrentThemeConditionTest extends KernelTestBase {
    */
   public static $modules = array('system', 'theme_test');
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-    $this->installSchema('system', array('router'));
-  }
-
   /**
    * Tests the current theme condition.
    */

core/modules/system/src/Tests/Element/PathElementFormTest.php

@@ -42,7 +42,7 @@ class PathElementFormTest extends KernelTestBase implements FormInterface {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', ['router', 'sequences', 'key_value_expire']);
+    $this->installSchema('system', ['sequences', 'key_value_expire']);
     $this->installEntitySchema('user');
     \Drupal::service('router.builder')->rebuild();
     /** @var \Drupal\user\RoleInterface $role */

core/modules/system/src/Tests/Entity/Element/EntityAutocompleteElementFormTest.php

@@ -50,7 +50,7 @@ class EntityAutocompleteElementFormTest extends EntityUnitTestBase implements Fo
   protected function setUp() {
     parent::setUp();
 
-    $this->installSchema('system', ['router', 'key_value_expire']);
+    $this->installSchema('system', ['key_value_expire']);
     \Drupal::service('router.builder')->rebuild();
 
     $this->testUser = User::create(array(

core/modules/system/src/Tests/Entity/EntityBundleFieldTest.php

@@ -41,7 +41,6 @@ class EntityBundleFieldTest extends EntityUnitTestBase  {
   protected function setUp() {
     parent::setUp();
     $this->installSchema('user', array('users_data'));
-    $this->installSchema('system', array('router'));
     $this->moduleHandler = $this->container->get('module_handler');
     $this->database = $this->container->get('database');
   }

core/modules/system/src/Tests/Entity/EntitySchemaTest.php

@@ -29,7 +29,6 @@ class EntitySchemaTest extends EntityUnitTestBase  {
   protected function setUp() {
     parent::setUp();
     $this->installSchema('user', array('users_data'));
-    $this->installSchema('system', array('router'));
     $this->database = $this->container->get('database');
   }
 

core/modules/system/src/Tests/Entity/FieldWidgetConstraintValidatorTest.php

@@ -29,7 +29,7 @@ class FieldWidgetConstraintValidatorTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
 
-    $this->installSchema('system', ['router', 'key_value']);
+    $this->installSchema('system', ['key_value']);
     $this->container->get('router.builder')->rebuild();
 
     $this->installEntitySchema('user');

core/modules/system/src/Tests/File/StreamWrapperTest.php

@@ -102,7 +102,6 @@ function testUriFunctions() {
     // Test file_create_url()
     // TemporaryStream::getExternalUrl() uses Url::fromRoute(), which needs
     // route information to work.
-    $this->installSchema('system', 'router');
     $this->container->get('router.builder')->rebuild();
     $this->assertTrue(strpos(file_create_url('temporary://test.txt'), 'system/temporary?file=test.txt'), 'Temporary external URL correctly built.');
     $this->assertTrue(strpos(file_create_url('public://test.txt'), Settings::get('file_public_path') . '/test.txt'), 'Public external URL correctly built.');

core/modules/system/src/Tests/HttpKernel/StackKernelIntegrationTest.php

@@ -31,8 +31,6 @@ class StackKernelIntegrationTest extends KernelTestBase {
    */
   protected function setUp() {
     parent::setUp();
-
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
   }
 

core/modules/system/src/Tests/Menu/MenuLinkDefaultIntegrationTest.php

@@ -27,14 +27,6 @@ class MenuLinkDefaultIntegrationTest extends KernelTestBase {
     'menu_test',
   );
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-    $this->installSchema('system', array('router'));
-  }
-
   /**
    * Tests moving a static menu link without a specified menu to the root.
    */

core/modules/system/src/Tests/Menu/MenuLinkTreeTest.php

@@ -53,7 +53,7 @@ class MenuLinkTreeTest extends KernelTestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router'));
+    \Drupal::service('router.builder')->rebuild();
     $this->installEntitySchema('menu_link_content');
 
     $this->linkTree = $this->container->get('menu.link_tree');

core/modules/system/src/Tests/Render/Element/TableTest.php

@@ -29,7 +29,6 @@ class TableTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
 
-    $this->installSchema('system', 'router');
     \Drupal::service('router.builder')->rebuild();
   }
 

core/modules/system/src/Tests/RouteProcessor/RouteNoneTest.php

@@ -42,7 +42,6 @@ class RouteNoneTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
 
-    $this->installSchema('system', ['router']);
     \Drupal::service('router.builder')->rebuild();
 
     $this->urlGenerator = \Drupal::urlGenerator();

core/modules/system/src/Tests/RouteProcessor/RouteProcessorCurrentIntegrationTest.php

@@ -41,7 +41,6 @@ class RouteProcessorCurrentIntegrationTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
 
-    $this->installSchema('system', ['router']);
     \Drupal::service('router.builder')->rebuild();
 
     $this->urlGenerator = \Drupal::urlGenerator();

core/modules/system/src/Tests/Routing/ContentNegotiationRoutingTest.php

@@ -31,7 +31,6 @@ protected function setUp() {
     \Drupal::unsetContainer();
     parent::setUp();
 
-    $this->installSchema('system', ['router']);
     \Drupal::service('router.builder')->rebuild();
   }
 

core/modules/system/src/Tests/Routing/ExceptionHandlingTest.php

@@ -30,7 +30,6 @@ class ExceptionHandlingTest extends KernelTestBase {
   protected function setUp() {
     parent::setUp();
 
-    $this->installSchema('system', ['router']);
     $this->installEntitySchema('date_format');
     \Drupal::service('router.builder')->rebuild();
   }

core/modules/system/src/Tests/Routing/UrlIntegrationTest.php

@@ -26,15 +26,6 @@ class UrlIntegrationTest extends KernelTestBase {
    */
   public static $modules = array('user', 'router_test', 'system');
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-
-    $this->installSchema('system', ['router']);
-  }
-
   /**
    * Ensures that the access() method on \Drupal\Core\Url objects works.
    */

core/modules/system/src/Tests/System/TokenReplaceUnitTestBase.php

@@ -39,7 +39,6 @@ protected function setUp() {
     parent::setUp();
     // Install default system configuration.
     $this->installConfig(array('system'));
-    $this->installSchema('system', array('router'));
     \Drupal::service('router.builder')->rebuild();
 
     $this->interfaceLanguage = \Drupal::languageManager()->getCurrentLanguage();

core/modules/system/src/Tests/Theme/TwigWhiteListTest.php

@@ -46,7 +46,7 @@ class TwigWhiteListTest extends KernelTestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->installSchema('system', array('router', 'sequences'));
+    $this->installSchema('system', array('sequences'));
     $this->installEntitySchema('node');
     $this->installEntitySchema('user');
     $this->installEntitySchema('taxonomy_term');

core/modules/system/system.install

@@ -919,55 +919,6 @@ function system_schema() {
     ),
   );
 
-  $schema['router'] = array(
-    'description' => 'Maps paths to various callbacks (access, page and title)',
-    'fields' => array(
-      'name' => array(
-        'description' => 'Primary Key: Machine name of this route',
-        'type' => 'varchar_ascii',
-        'length' => 255,
-        'not null' => TRUE,
-        'default' => '',
-      ),
-      'path' => array(
-        'description' => 'The path for this URI',
-        'type' => 'varchar',
-        'length' => 255,
-        'not null' => TRUE,
-        'default' => '',
-      ),
-      'pattern_outline' => array(
-        'description' => 'The pattern',
-        'type' => 'varchar',
-        'length' => 255,
-        'not null' => TRUE,
-        'default' => '',
-      ),
-      'fit' => array(
-        'description' => 'A numeric representation of how specific the path is.',
-        'type' => 'int',
-        'not null' => TRUE,
-        'default' => 0,
-      ),
-      'route' => array(
-        'description' => 'A serialized Route object',
-        'type' => 'blob',
-        'size' => 'big',
-      ),
-      'number_parts' => array(
-        'description' => 'Number of parts in this router path.',
-        'type' => 'int',
-        'not null' => TRUE,
-        'default' => 0,
-        'size' => 'small',