Issue #1608842 by chx, alexpott, sun, effulgentsia, beejeebus, tim.plunkett et...

Issue #1608842 by chx, alexpott, sun, effulgentsia, beejeebus, tim.plunkett et al: Replace list of bootstrap modules, enabled modules, enabled themes, and default theme with config.

core/includes/bootstrap.inc

@@ -890,28 +890,27 @@ function drupal_get_filename($type, $name, $filename = NULL) {
   elseif (isset($files[$type][$name])) {
     // nothing
   }
-  // Verify that we have an active database connection, before querying
-  // the database. This is required because this function is called both
-  // before we have a database connection (i.e. during installation) and
-  // when a database connection fails.
   else {
-    try {
-      if (function_exists('db_query')) {
-        $file = db_query("SELECT filename FROM {system} WHERE name = :name AND type = :type", array(':name' => $name, ':type' => $type))->fetchField();
-        if ($file && file_exists(DRUPAL_ROOT . '/' . $file)) {
-          $files[$type][$name] = $file;
+    // Verify that we have an keyvalue service before using it. This is required
+    // because this function is called during installation.
+    // @todo Inject database connection into KeyValueStore\DatabaseStorage.
+    if (drupal_container()->hasDefinition('keyvalue') && function_exists('db_query')) {
+      try {
+        $file_list = state()->get('system.' . $type . '.files');
+        if ($file_list && isset($file_list[$name]) && file_exists(DRUPAL_ROOT . '/' . $file_list[$name])) {
+          $files[$type][$name] = $file_list[$name];
         }
       }
-    }
-    catch (Exception $e) {
-      // The database table may not exist because Drupal is not yet installed,
-      // or the database might be down. We have a fallback for this case so we
-      // hide the error completely.
+      catch (Exception $e) {
+        // The keyvalue service raised an exception because the backend might
+        // be down. We have a fallback for this case so we hide the error
+        // completely.
+      }
     }
     // Fallback to searching the filesystem if the database could not find the
     // file or the file returned by the database is not found.
     if (!isset($files[$type][$name])) {
-      // We have a consistent directory naming: modules, themes...
+      // We have consistent directory naming: modules, themes...
       $dir = $type . 's';
       if ($type == 'theme_engine') {
         $dir = 'themes/engines';
@@ -2466,9 +2465,10 @@ function drupal_container(Container $new_container = NULL, $rebuild = FALSE) {
     $container
       ->register('config.storage.staging', 'Drupal\Core\Config\FileStorage')
       ->addArgument(config_get_config_directory(CONFIG_STAGING_DIRECTORY));
+
+    // Register the KeyValueStore factory.
     $container
-      ->register('state.storage', 'Drupal\Core\KeyValueStore\DatabaseStorage')
-      ->addArgument('state');
+      ->register('keyvalue', 'Drupal\Core\KeyValueStore\KeyValueFactory');
   }
   return $container;
 }
@@ -2485,7 +2485,7 @@ function drupal_container(Container $new_container = NULL, $rebuild = FALSE) {
  * @return Drupal\Core\KeyValueStore\KeyValueStoreInterface
  */
 function state() {
-  return drupal_container()->get('state.storage');
+  return drupal_container()->get('keyvalue')->get('state');
 }
 
 /**
@@ -2504,16 +2504,22 @@ function typed_data() {
 /**
  * Returns the test prefix if this is an internal request from SimpleTest.
  *
+ * @param string $new_prefix
+ *   Internal use only. A new prefix to be stored. Passed in by tests that use
+ *   the test runner from within a test.
+ *
  * @return
  *   Either the simpletest prefix (the string "simpletest" followed by any
  *   number of digits) or FALSE if the user agent does not contain a valid
  *   HMAC and timestamp.
  */
-function drupal_valid_test_ua() {
+function drupal_valid_test_ua($new_prefix = NULL) {
   global $drupal_hash_salt;
-  // No reason to reset this.
   static $test_prefix;
 
+  if (isset($new_prefix)) {
+    $test_prefix = $new_prefix;
+  }
   if (isset($test_prefix)) {
     return $test_prefix;
   }

core/includes/install.core.inc

@@ -322,9 +322,6 @@ function install_begin_request(&$install_state) {
     $container->register('config.factory', 'Drupal\Core\Config\ConfigFactory')
       ->addArgument(new Reference('config.storage'))
       ->addArgument(new Reference('dispatcher'));
-    $container
-      ->register('state.storage', 'Drupal\Core\KeyValueStore\DatabaseStorage')
-      ->addArgument('state');
     drupal_container($container);
   }
 
@@ -1661,15 +1658,12 @@ function install_import_translations_remaining(&$install_state) {
  *   A message informing the user that the installation is complete.
  */
 function install_finished(&$install_state) {
+  $profile = drupal_get_profile();
   // Remember the profile which was used.
-  variable_set('install_profile', drupal_get_profile());
+  variable_set('install_profile', $profile);
 
   // Installation profiles are always loaded last.
-  db_update('system')
-    ->fields(array('weight' => 1000))
-    ->condition('type', 'module')
-    ->condition('name', drupal_get_profile())
-    ->execute();
+  module_set_weight($profile, 1000);
 
   // Flush all caches to ensure that any full bootstraps during the installer
   // do not leave stale cached data, and that any content types or other items

core/includes/install.inc

@@ -8,16 +8,6 @@
 use Drupal\Core\Database\Database;
 use Drupal\locale\Gettext;
 
-/**
- * Indicates that a module has not been installed yet.
- */
-const SCHEMA_UNINSTALLED = -1;
-
-/**
- * Indicates that a module has been installed.
- */
-const SCHEMA_INSTALLED = 0;
-
 /**
  * Requirement severity -- Informational message only.
  */
@@ -420,28 +410,24 @@ function drupal_install_system() {
   require_once DRUPAL_ROOT . '/' . $system_path . '/system.install';
   $system_versions = drupal_get_schema_versions('system');
   $system_version = $system_versions ? max($system_versions) : SCHEMA_INSTALLED;
-  db_insert('system')
-    ->fields(array('filename', 'name', 'type', 'owner', 'status', 'schema_version', 'bootstrap'))
-    ->values(array(
-        'filename' => $system_path . '/system.module',
-        'name' => 'system',
-        'type' => 'module',
-        'owner' => '',
-        'status' => 1,
-        'schema_version' => $system_version,
-        'bootstrap' => 0,
-      ))
-    ->execute();
-
-  // Clear out module list and hook implementation statics before calling
-  // system_rebuild_theme_data().
+  drupal_container()
+    ->get('keyvalue')
+    ->get('system.schema')
+    ->set('system', $system_version);
+
+  // System module needs to be enabled and the system/module lists need to be
+  // reset first in order to allow config_install_default_config() to invoke
+  // config import callbacks.
+  // @todo Installation profiles may override the system.module config object.
+  config('system.module')
+    ->set('enabled.system', 0)
+    ->save();
+
+  // Clear out module list and hook implementation statics.
   system_list_reset();
   module_list_reset();
   module_implements_reset();
 
-  system_rebuild_module_data();
-  system_rebuild_theme_data();
-
   config_install_default_config('module', 'system');
 
   module_invoke('system', 'install');

core/includes/schema.inc

@@ -14,6 +14,16 @@
  * @{
  */
 
+/**
+ * Indicates that a module has not been installed yet.
+ */
+const SCHEMA_UNINSTALLED = -1;
+
+/**
+ * Indicates that a module has been installed.
+ */
+const SCHEMA_INSTALLED = 0;
+
 /**
  * Gets the schema definition of a table, or the whole database schema.
  *
@@ -156,7 +166,7 @@ function drupal_get_schema_versions($module) {
  * @param string $module
  *   A module name.
  * @param bool $reset
- *   Set to TRUE after modifying the system table.
+ *   Set to TRUE after installing or uninstalling an extension.
  * @param bool $array
  *   Set to TRUE if you want to get information about all modules in the
  *   system.
@@ -173,10 +183,8 @@ function drupal_get_installed_schema_version($module, $reset = FALSE, $array = F
   }
 
   if (!$versions) {
-    $versions = array();
-    $result = db_query("SELECT name, schema_version FROM {system} WHERE type = :type", array(':type' => 'module'));
-    foreach ($result as $row) {
-      $versions[$row->name] = $row->schema_version;
+    if (!$versions = drupal_container()->get('keyvalue')->get('system.schema')->getAll()) {
+      $versions = array();
     }
   }
 
@@ -197,11 +205,7 @@ function drupal_get_installed_schema_version($module, $reset = FALSE, $array = F
  *   The new schema version.
  */
 function drupal_set_installed_schema_version($module, $version) {
-  db_update('system')
-    ->fields(array('schema_version' => $version))
-    ->condition('name', $module)
-    ->execute();
-
+  drupal_container()->get('keyvalue')->get('system.schema')->set($module, $version);
   // Reset the static cache of module schema versions.
   drupal_get_installed_schema_version(NULL, TRUE);
 }

core/includes/theme.inc

@@ -1412,17 +1412,17 @@ function theme_render_template($template_file, $variables) {
  */
 function theme_enable($theme_list) {
   drupal_clear_css_cache();
-
+  $theme_config = config('system.theme');
+  $disabled_themes = config('system.theme.disabled');
   foreach ($theme_list as $key) {
-    db_update('system')
-      ->fields(array('status' => 1))
-      ->condition('type', 'theme')
-      ->condition('name', $key)
-      ->execute();
-
+    // The value is not used; the weight is ignored for themes currently.
+    $theme_config->set("enabled.$key", 0);
+    $disabled_themes->clear($key);
     // Install default configuration of the theme.
     config_install_default_config('theme', $key);
   }
+  $theme_config->save();
+  $disabled_themes->save();
 
   list_themes(TRUE);
   menu_router_rebuild();
@@ -1449,13 +1449,15 @@ function theme_disable($theme_list) {
 
   drupal_clear_css_cache();
 
+  $theme_config = config('system.theme');
+  $disabled_themes = config('system.theme.disabled');
   foreach ($theme_list as $key) {
-    db_update('system')
-      ->fields(array('status' => 0))
-      ->condition('type', 'theme')
-      ->condition('name', $key)
-      ->execute();
+    // The value is not used; the weight is ignored for themes currently.
+    $theme_config->clear("enabled.$key");
+    $disabled_themes->set($key, 0);
   }
+  $theme_config->save();
+  $disabled_themes->save();
 
   list_themes(TRUE);
   menu_router_rebuild();

core/lib/Drupal/Core/KeyValueStore/KeyValueFactory.php

+<?php
+
+/**
+ * @file
+ * Contains Drupal\Core\KeyValueStore\KeyValueFactory.
+ */
+
+namespace Drupal\Core\KeyValueStore;
+
+/**
+ * Defines the key/value store factory.
+ */
+class KeyValueFactory {
+
+  /**
+   * Instantiated stores, keyed by collection name.
+   *
+   * @var array
+   */
+  protected $stores = array();
+
+  /**
+   * Constructs a new key/value store for a given collection name.
+   *
+   * @param string $collection
+   *   The name of the collection holding key and value pairs.
+   *
+   * @return Drupal\Core\KeyValueStore\DatabaseStorage
+   *   A key/value store implementation for the given $collection.
+   */
+  public function get($collection) {
+    if (!isset($this->stores[$collection])) {
+      $this->stores[$collection] = new DatabaseStorage($collection);
+    }
+    return $this->stores[$collection];
+  }
+}

core/lib/Drupal/Core/Updater/Theme.php

@@ -72,7 +72,7 @@ public static function canUpdate($project_name) {
    * Overrides Drupal\Core\Updater\Updater::postInstall().
    */
   public function postInstall() {
-    // Update the system table.
+    // Update the theme info.
     clearstatcache();
     system_rebuild_theme_data();
   }

core/modules/action/tests/action_loop_test/action_loop_test.install

@@ -4,8 +4,5 @@
  * Implements hook_install().
  */
 function action_loop_test_install() {
-   db_update('system')
-    ->fields(array('weight' => 1))
-    ->condition('name', 'action_loop_test')
-    ->execute();
+  module_set_weight('action_loop_test', 1);
 }

core/modules/block/block.install

@@ -217,10 +217,7 @@ function block_install() {
   // Block should go first so that other modules can alter its output
   // during hook_page_alter(). Almost everything on the page is a block,
   // so before block module runs, there will not be much to alter.
-  db_update('system')
-    ->fields(array('weight' => -5))
-    ->condition('name', 'block')
-    ->execute();
+  module_set_weight('block', -5);
 }
 
 /**

core/modules/block/block.module

@@ -958,12 +958,10 @@ function block_cache_flush() {
  * Implements hook_rebuild().
  */
 function block_rebuild() {
-  // Rehash blocks for active themes. We don't use list_themes() here,
-  // because if MAINTENANCE_MODE is defined it skips reading the database,
-  // and we can't tell which themes are active.
-  $themes = db_query("SELECT name FROM {system} WHERE type = 'theme' AND status = 1");
-  foreach ($themes as $theme) {
-    _block_rehash($theme->name);
+  foreach (list_themes() as $name => $data) {
+    if ($data->status) {
+      _block_rehash($name);
+    }
   }
 }
 

core/modules/field/tests/modules/field_test/field_test.install

@@ -10,10 +10,7 @@
  */
 function field_test_install() {
   // hook_entity_info_alter() needs to be executed as last.
-  db_update('system')
-    ->fields(array('weight' => 1))
-    ->condition('name', 'field_test')
-    ->execute();
+  module_set_weight('field_test', 1);
 }
 
 /**

core/modules/forum/forum.install

@@ -10,10 +10,7 @@
  */
 function forum_install() {
   // Set the weight of the forum.module to 1 so it is loaded after the taxonomy.module.
-  db_update('system')
-    ->fields(array('weight' => 1))
-    ->condition('name', 'forum')
-    ->execute();
+  module_set_weight('forum', 1);
   // Forum topics are published by default, but do not have any other default
   // options set (for example, they are not promoted to the front page).
   // @todo Convert to default module configuration, once Node module's content

core/modules/help/lib/Drupal/help/Tests/HelpTest.php

@@ -107,12 +107,9 @@ protected function verifyHelp($response = 200) {
    */
   protected function getModuleList() {
     $modules = array();
-    $result = db_query("SELECT name, filename, info FROM {system} WHERE type = 'module' AND status = 1 ORDER BY weight ASC, filename ASC");
-    foreach ($result as $module) {
-      if (file_exists($module->filename) && function_exists($module->name . '_help')) {
-        $fullname = unserialize($module->info);
-        $modules[$module->name] = $fullname['name'];
-      }
+    $module_data = system_rebuild_module_data();
+    foreach (module_implements('help') as $module) {
+      $modules[$module] = $module_data[$module]->info['name'];
     }
     return $modules;
   }

core/modules/locale/lib/Drupal/locale/Tests/LocaleCompareTest.php

@@ -48,8 +48,11 @@ function testLocaleCompare() {
     // info of the locale_test and locale_test_disabled modules.
     variable_set('locale_translation_test_system_info_alter', TRUE);
 
-    // Check if interface translation data is collected from hook_info.
+    // Reset static system list caches to reflect info changes.
     drupal_static_reset('locale_translation_project_list');
+    system_list_reset();
+
+    // Check if interface translation data is collected from hook_info.
     $projects = locale_translation_project_list();
     $this->assertEqual($projects['locale_test']['info']['interface translation server pattern'], 'core/modules/locale/test/modules/locale_test/%project-%version.%language.po', 'Interface translation parameter found in project info.');
     $this->assertEqual($projects['locale_test']['name'] , 'locale_test', format_string('%key found in project info.', array('%key' => 'interface translation project')));

core/modules/simpletest/lib/Drupal/simpletest/TestBase.php

@@ -121,6 +121,13 @@ abstract class TestBase {
    */
   protected $verboseDirectory;
 
+  /**
+   * The original database prefix when running inside Simpletest.
+   *
+   * @var string
+   */
+  protected $originalPrefix;
+
   /**
    * Constructor for Test.
    *
@@ -722,6 +729,13 @@ protected function prepareEnvironment() {
     global $user, $conf;
     $language_interface = language(LANGUAGE_TYPE_INTERFACE);
 
+    // When running the test runner within a test, back up the original database
+    // prefix and re-set the new/nested prefix in drupal_valid_test_ua().
+    if (drupal_valid_test_ua()) {
+      $this->originalPrefix = drupal_valid_test_ua();
+      drupal_valid_test_ua($this->databasePrefix);
+    }
+
     // Backup current in-memory configuration.
     $this->originalConf = $conf;
 
@@ -858,6 +872,9 @@ protected function tearDown() {
     drupal_container($this->originalContainer);
     $language_interface = $this->originalLanguage;
     $GLOBALS['config_directories'] = $this->originalConfigDirectories;
+    if (isset($this->originalPrefix)) {
+      drupal_valid_test_ua($this->originalPrefix);
+    }
 
     // Restore original shutdown callbacks.
     $callbacks = &drupal_register_shutdown_function();

core/modules/simpletest/simpletest.module

@@ -323,16 +323,16 @@ function simpletest_test_get_all() {
     else {
       // Select all PSR-0 classes in the Tests namespace of all modules.
       $classes = array();
-      $system_list = db_query("SELECT name, filename FROM {system}")->fetchAllKeyed();
-
-      foreach ($system_list as $name => $filename) {
+      $module_data = system_rebuild_module_data();
+      $all_data = $module_data + system_rebuild_theme_data();
+      foreach ($all_data as $name => $data) {
         // Build directory in which the test files would reside.
-        $tests_dir = DRUPAL_ROOT . '/' . dirname($filename) . '/lib/Drupal/' . $name . '/Tests';
+        $tests_dir = DRUPAL_ROOT . '/' . dirname($data->filename) . '/lib/Drupal/' . $name . '/Tests';
         // Scan it for test files if it exists.
         if (is_dir($tests_dir)) {
           $files = file_scan_directory($tests_dir, '/.*\.php/');
           if (!empty($files)) {
-            $basedir = DRUPAL_ROOT . '/' . dirname($filename) . '/lib/';
+            $basedir = DRUPAL_ROOT . '/' . dirname($data->filename) . '/lib/';
             foreach ($files as $file) {
               // Convert the file name into the namespaced class name.
               $replacements = array(
@@ -357,7 +357,7 @@ function simpletest_test_get_all() {
           // If this test class requires a non-existing module, skip it.
           if (!empty($info['dependencies'])) {
             foreach ($info['dependencies'] as $module) {
-              if (!drupal_get_filename('module', $module)) {
+              if (!isset($module_data[$module])) {
                 continue 2;
               }
             }
@@ -385,12 +385,10 @@ function simpletest_test_get_all() {
  * Registers namespaces for disabled modules.
  */
 function simpletest_classloader_register() {
-  // Get the cached test modules list and register a test namespace for each.
-  $disabled_modules = db_query("SELECT name, filename FROM {system} WHERE status = 0")->fetchAllKeyed();
-  if ($disabled_modules) {
-    foreach ($disabled_modules as $name => $filename) {
-      drupal_classloader_register($name, dirname($filename));
-    }
+  $all_data = system_rebuild_module_data();
+  $all_data += system_rebuild_theme_data();
+  foreach ($all_data as $name => $data) {
+    drupal_classloader_register($name, dirname($data->filename));
   }
 }
 

core/modules/system/config/system.module.yml

+enabled:
+  system: '0'

core/modules/system/config/system.theme.yml

+enabled:
+  stark: '0'

core/modules/system/lib/Drupal/system/Tests/Database/RangeQueryTest.php

@@ -7,12 +7,10 @@
 
 namespace Drupal\system\Tests\Database;
 
-use Drupal\simpletest\WebTestBase;
-
 /**
  * Range query tests.
  */
-class RangeQueryTest extends WebTestBase {
+class RangeQueryTest extends DatabaseTestBase {
 
   /**
    * Modules to enable.
@@ -34,12 +32,12 @@ public static function getInfo() {
    */
   function testRangeQuery() {
     // Test if return correct number of rows.
-    $range_rows = db_query_range("SELECT name FROM {system} ORDER BY name", 2, 3)->fetchAll();
+    $range_rows = db_query_range("SELECT name FROM {test} ORDER BY name", 1, 3)->fetchAll();
     $this->assertEqual(count($range_rows), 3, 'Range query work and return correct number of rows.');
 
     // Test if return target data.
-    $raw_rows = db_query('SELECT name FROM {system} ORDER BY name')->fetchAll();
-    $raw_rows = array_slice($raw_rows, 2, 3);
-    $this->assertEqual($range_rows, $raw_rows, 'Range query work and return target data.');
+    $raw_rows = db_query('SELECT name FROM {test} ORDER BY name')->fetchAll();
+    $raw_rows = array_slice($raw_rows, 1, 3);
+    $this->assertEqual($range_rows, $raw_rows);
   }
 }

core/modules/system/lib/Drupal/system/Tests/Database/TemporaryQueryTest.php

@@ -7,12 +7,10 @@
 
 namespace Drupal\system\Tests\Database;
 
-use Drupal\simpletest\WebTestBase;
-
 /**
  * Temporary query tests.
  */
-class TemporaryQueryTest extends WebTestBase {
+class TemporaryQueryTest extends DatabaseTestBase {
 
   /**
    * Modules to enable.
@@ -43,7 +41,7 @@ function testTemporaryQuery() {
     $this->drupalGet('database_test/db_query_temporary');
     $data = json_decode($this->drupalGetContent());
     if ($data) {
-      $this->assertEqual($this->countTableRows("system"), $data->row_count, 'The temporary table contains the correct amount of rows.');
+      $this->assertEqual($this->countTableRows('test'), $data->row_count, 'The temporary table contains the correct amount of rows.');
       $this->assertFalse(db_table_exists($data->table_name), 'The temporary table is, indeed, temporary.');
     }
     else {
@@ -51,10 +49,10 @@ function testTemporaryQuery() {
     }
 
     // Now try to run two db_query_temporary() in the same request.
-    $table_name_system = db_query_temporary('SELECT status FROM {system}', array());
-    $table_name_users = db_query_temporary('SELECT uid FROM {users}', array());
+    $table_name_test = db_query_temporary('SELECT name FROM {test}', array());
+    $table_name_task = db_query_temporary('SELECT pid FROM {test_task}', array());
 
-    $this->assertEqual($this->countTableRows($table_name_system), $this->countTableRows("system"), 'A temporary table was created successfully in this request.');
-    $this->assertEqual($this->countTableRows($table_name_users), $this->countTableRows("users"), 'A second temporary table was created successfully in this request.');
+    $this->assertEqual($this->countTableRows($table_name_test), $this->countTableRows('test'), 'A temporary table was created successfully in this request.');
+    $this->assertEqual($this->countTableRows($table_name_task), $this->countTableRows('test_task'), 'A second temporary table was created successfully in this request.');
   }
 }

core/modules/system/lib/Drupal/system/Tests/Module/ModuleApiTest.php

@@ -49,11 +49,7 @@ function testModuleList() {
     $this->assertModuleList($module_list, t('After adding a module'));
 
     // Try to mess with the module weights.
-    db_update('system')
-      ->fields(array('weight' => 20))
-      ->condition('name', 'contact')
-      ->condition('type', 'module')
-      ->execute();
+    module_set_weight('contact', 20);
     // Reset the module list.
     system_list_reset();
     // Move contact to the end of the array.

core/modules/system/lib/Drupal/system/Tests/Module/ModuleEnable.php

+<?php
+
+/**
+ * @file
+ * Contains Drupal\system\Tests\Module\ModuleEnable.
+ */
+
+namespace Drupal\system\Tests\Module;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests module_enable().
+ */
+class ModuleEnable extends WebTestBase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Module enable',
+      'description' => 'Tests module_enable().',
+      'group' => 'Module',
+    );
+  }
+
+  /**
+   * Tests enabling User module once more.
+   *
+   * Regression: The installer might enable a module twice due to automatic
+   * dependency resolution. A bug caused the stored weight for User module to
+   * be an array.
+   */
+  function testEnableUserTwice() {
+    module_enable(array('user'), FALSE);
+    $this->assertIdentical(config('system.module')->get('enabled.user'), '0');
+  }
+
+  /**
+   * Tests recorded schema versions of early installed modules in the installer.
+   */
+  function testRequiredModuleSchemaVersions() {
+    $version = drupal_get_installed_schema_version('system', TRUE);
+    $this->assertTrue($version > 0, 'System module version is > 0.');
+    $version = drupal_get_installed_schema_version('user', TRUE);
+    $this->assertTrue($version > 0, 'User module version is > 0.');
+  }
+
+}

core/modules/system/lib/Drupal/system/Tests/System/InfoAlterTest.php

@@ -22,19 +22,21 @@ public static function getInfo() {
   }
 
   /**
-   * Tests that {system}.info is rebuilt after a module that implements
+   * Tests that theme .info data is rebuild after enabling a module.
+   *
+   * Tests that info data is rebuilt after a module that implements
    * hook_system_info_alter() is enabled. Also tests if core *_list() functions
    * return freshly altered info.
    */
   function testSystemInfoAlter() {
-    // Enable our test module. Flush all caches, which we assert is the only
-    // thing necessary to use the rebuilt {system}.info.
+    // Enable seven and the test module.