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class MigrateNodeTest in Drupal 10

Same name in this branch
  1. 10 core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php \Drupal\Tests\node\Kernel\Migrate\d6\MigrateNodeTest
  2. 10 core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTest.php \Drupal\Tests\node\Kernel\Migrate\d7\MigrateNodeTest
Same name and namespace in other branches
  1. 8 core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php \Drupal\Tests\node\Kernel\Migrate\d6\MigrateNodeTest
  2. 9 core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php \Drupal\Tests\node\Kernel\Migrate\d6\MigrateNodeTest

Node content migration.

@group migrate_drupal_6

Hierarchy

Expanded class hierarchy of MigrateNodeTest

File

core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php, line 15

Namespace

Drupal\Tests\node\Kernel\Migrate\d6
View source 
class MigrateNodeTest extends MigrateNodeTestBase {
  use FileMigrationTestTrait;

  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'language',
    'content_translation',
    'menu_ui',
  ];

  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this
      ->setUpMigratedFiles();
    $this
      ->installSchema('file', [
      'file_usage',
    ]);
    $this
      ->executeMigrations([
      'language',
      'd6_language_content_settings',
      'd6_node',
      'd6_node_translation',
    ]);
  }

  /**
   * Tests node migration from Drupal 6 to 8.
   */
  public function testNode() {

    // Confirm there are only classic node migration map tables. This shows
    // that only the classic migration ran.
    $results = $this
      ->nodeMigrateMapTableCount('6');
    $this
      ->assertSame(14, $results['node']);
    $this
      ->assertSame(0, $results['node_complete']);
    $node = Node::load(1);
    $this
      ->assertSame('1', $node
      ->id(), 'Node 1 loaded.');
    $this
      ->assertSame('und', $node->langcode->value);
    $this
      ->assertSame('body test rev 3', $node->body->value);
    $this
      ->assertSame('teaser test rev 3', $node->body->summary);
    $this
      ->assertSame('filtered_html', $node->body->format);
    $this
      ->assertSame('story', $node
      ->getType(), 'Node has the correct bundle.');
    $this
      ->assertSame('Test title rev 3', $node
      ->getTitle(), 'Node has the correct title.');
    $this
      ->assertSame('1390095702', $node
      ->getCreatedTime(), 'Node has the correct created time.');
    $this
      ->assertFalse($node
      ->isSticky());
    $this
      ->assertSame('1', $node
      ->getOwnerId());
    $this
      ->assertSame('1420861423', $node
      ->getRevisionCreationTime());

    /** @var \Drupal\node\NodeInterface $node_revision */
    $node_revision = \Drupal::entityTypeManager()
      ->getStorage('node')
      ->loadRevision(2001);
    $this
      ->assertSame('Test title rev 3', $node_revision
      ->getTitle());
    $this
      ->assertSame('2', $node_revision
      ->getRevisionUser()
      ->id(), 'Node revision has the correct user');
    $this
      ->assertSame('1', $node_revision
      ->id(), 'Node 1 loaded.');
    $this
      ->assertSame('2001', $node_revision
      ->getRevisionId(), 'Node 1 revision 2001 loaded.');

    // This is empty on the first revision.
    $this
      ->assertSame('modified rev 3', $node_revision->revision_log->value);
    $this
      ->assertSame('This is a shared text field', $node->field_test->value);
    $this
      ->assertSame('filtered_html', $node->field_test->format);
    $this
      ->assertSame('10', $node->field_test_two->value);
    $this
      ->assertSame('20', $node->field_test_two[1]->value);
    $this
      ->assertSame('42.42', $node->field_test_three->value, 'Single field second value is correct.');
    $this
      ->assertSame('3412', $node->field_test_integer_selectlist[0]->value);
    $this
      ->assertSame('1', $node->field_test_identical1->value, 'Integer value is correct');
    $this
      ->assertSame('1', $node->field_test_identical2->value, 'Integer value is correct');
    $this
      ->assertSame('This is a field with exclude unset.', $node->field_test_exclude_unset->value, 'Field with exclude unset is correct.');

    // Test that date fields are migrated.
    $this
      ->assertSame('2013-01-02T04:05:00', $node->field_test_date->value, 'Date field is correct');
    $this
      ->assertSame('1391357160', $node->field_test_datestamp->value, 'Datestamp field is correct');
    $this
      ->assertSame('2015-03-04T06:07:00', $node->field_test_datetime->value, 'Datetime field is correct');

    // Test that link fields are migrated.
    $this
      ->assertSame('https://www.drupal.org/project/drupal', $node->field_test_link->uri);
    $this
      ->assertSame('Drupal project page', $node->field_test_link->title);
    $this
      ->assertSame([
      'target' => '_blank',
    ], $node->field_test_link->options['attributes']);

    // Test the file field meta.
    $this
      ->assertSame('desc', $node->field_test_filefield->description);
    $this
      ->assertSame('4', $node->field_test_filefield->target_id);

    // Test that an email field is migrated.
    $this
      ->assertSame('PrincessRuwenne@example.com', $node->field_test_email->value);

    // Test that node reference field values were migrated.
    $node = Node::load(18);
    $this
      ->assertCount(2, $node->field_company);
    $this
      ->assertSame('Klingon Empire', $node->field_company[0]->entity
      ->label());
    $this
      ->assertSame('Romulan Empire', $node->field_company[1]->entity
      ->label());
    $this
      ->assertCount(1, $node->field_company_2);
    $this
      ->assertSame('Klingon Empire', $node->field_company_2[0]->entity
      ->label());
    $this
      ->assertCount(1, $node->field_company_3);
    $this
      ->assertSame('Romulan Empire', $node->field_company_3[0]->entity
      ->label());

    // Test that user reference field values were migrated.
    $this
      ->assertCount(1, $node->field_commander);
    $this
      ->assertSame('joe.roe', $node->field_commander[0]->entity
      ->getAccountName());
    $node = Node::load(2);
    $this
      ->assertSame('Test title rev 3', $node
      ->getTitle());
    $this
      ->assertSame('test rev 3', $node->body->value);
    $this
      ->assertSame('filtered_html', $node->body->format);

    // Test that a link field with an external link is migrated.
    $this
      ->assertSame('http://groups.drupal.org/', $node->field_test_link->uri);
    $this
      ->assertSame('Drupal Groups', $node->field_test_link->title);
    $this
      ->assertSame([], $node->field_test_link->options['attributes']);
    $node = Node::load(3);

    // Test multivalue field.
    $value_1 = $node->field_multivalue->value;
    $value_2 = $node->field_multivalue[1]->value;

    // SQLite does not support scales for float data types so we need to convert
    // the value manually.
    if ($this->container
      ->get('database')
      ->driver() == 'sqlite') {
      $value_1 = sprintf('%01.2f', $value_1);
      $value_2 = sprintf('%01.2f', $value_2);
    }
    $this
      ->assertSame('33.00', $value_1);
    $this
      ->assertSame('44.00', $value_2);

    // Test that a link field with an internal link is migrated.
    $node = Node::load(9);
    $this
      ->assertSame('internal:/node/10', $node->field_test_link->uri);
    $this
      ->assertSame('Buy it now', $node->field_test_link->title);
    $this
      ->assertSame([
      'attributes' => [
        'target' => '_blank',
      ],
    ], $node->field_test_link->options);

    // Test that translations are working.
    $node = Node::load(10);
    $this
      ->assertSame('en', $node->langcode->value);
    $this
      ->assertSame('The Real McCoy', $node->title->value);
    $this
      ->assertTrue($node
      ->hasTranslation('fr'), "Node 10 has french translation");

    // Test that content_translation_source is set.
    $manager = $this->container
      ->get('content_translation.manager');
    $this
      ->assertSame('en', $manager
      ->getTranslationMetadata($node
      ->getTranslation('fr'))
      ->getSource());

    // Test that content_translation_source for a source other than English.
    $node = Node::load(12);
    $this
      ->assertSame('zu', $manager
      ->getTranslationMetadata($node
      ->getTranslation('en'))
      ->getSource());

    // Node 11 is a translation of node 10, and should not be imported separately.
    $this
      ->assertNull(Node::load(11), "Node 11 doesn't exist in D8, it was a translation");

    // Rerun migration with two source database changes.
    // 1. Add an invalid link attributes and a different URL and
    // title. If only the attributes are changed the error does not occur.
    Database::getConnection('default', 'migrate')
      ->update('content_type_story')
      ->fields([
      'field_test_link_url' => 'https://www.drupal.org/node/2127611',
      'field_test_link_title' => 'Migrate API in Drupal 8',
      'field_test_link_attributes' => '',
    ])
      ->condition('nid', '2')
      ->condition('vid', '3')
      ->execute();

    // 2. Add a leading slash to an internal link.
    Database::getConnection('default', 'migrate')
      ->update('content_type_story')
      ->fields([
      'field_test_link_url' => '/node/10',
    ])
      ->condition('nid', '9')
      ->condition('vid', '12')
      ->execute();
    $this
      ->rerunMigration();
    $node = Node::load(2);
    $this
      ->assertSame('https://www.drupal.org/node/2127611', $node->field_test_link->uri);
    $this
      ->assertSame('Migrate API in Drupal 8', $node->field_test_link->title);
    $this
      ->assertSame([], $node->field_test_link->options['attributes']);
    $node = Node::load(9);
    $this
      ->assertSame('internal:/node/10', $node->field_test_link->uri);
    $this
      ->assertSame('Buy it now', $node->field_test_link->title);
    $this
      ->assertSame([
      'attributes' => [
        'target' => '_blank',
      ],
    ], $node->field_test_link->options);

    // Test that we can re-import using the EntityContentBase destination.
    $title = $this
      ->rerunMigration();
    $node = Node::load(2);
    $this
      ->assertSame($title, $node
      ->getTitle());

    // Test multi-column fields are correctly upgraded.
    $this
      ->assertSame('test rev 3', $node->body->value);
    $this
      ->assertSame('full_html', $node->body->format);

    // Now insert a row indicating a failure and set to update later.
    $title = $this
      ->rerunMigration([
      'sourceid1' => 2,
      'destid1' => NULL,
      'source_row_status' => MigrateIdMapInterface::STATUS_NEEDS_UPDATE,
    ]);
    $node = Node::load(2);
    $this
      ->assertSame($title, $node
      ->getTitle());

    // Test synchronized field.
    $value = 'jsmith@example.com';
    $node = Node::load(21);
    $this
      ->assertSame($value, $node->field_sync->value);
    $this
      ->assertArrayNotHasKey('field_sync', $node
      ->getTranslatableFields());
    $node = $node
      ->getTranslation('fr');
    $this
      ->assertSame($value, $node->field_sync->value);
  }

  /**
   * Execute the migration a second time.
   *
   * @param array $new_row
   *   An optional row to be inserted into the id map.
   *
   * @return string
   *   The new title in the source for vid 3.
   */
  protected function rerunMigration($new_row = []) {
    $title = $this
      ->randomString();
    $source_connection = Database::getConnection('default', 'migrate');
    $source_connection
      ->update('node_revisions')
      ->fields([
      'title' => $title,
      'format' => 2,
    ])
      ->condition('vid', 3)
      ->execute();
    $migration = $this
      ->getMigration('d6_node:story');
    $table_name = $migration
      ->getIdMap()
      ->mapTableName();
    $default_connection = \Drupal::database();
    $default_connection
      ->truncate($table_name)
      ->execute();
    if ($new_row) {
      $hash = $migration
        ->getIdMap()
        ->getSourceIdsHash([
        'nid' => $new_row['sourceid1'],
      ]);
      $new_row['source_ids_hash'] = $hash;
      $default_connection
        ->insert($table_name)
        ->fields($new_row)
        ->execute();
    }
    $this
      ->executeMigration($migration);
    return $title;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
AssertContentTrait::$content protected property The current raw content.
AssertContentTrait::$drupalSettings protected property The drupalSettings value from the current raw $content.
AssertContentTrait::$elements protected property The XML structure parsed from the current raw $content. 1
AssertContentTrait::$plainTextContent protected property The plain-text content of raw $content (text nodes).
AssertContentTrait::assertEscaped protected function Passes if the raw text IS found escaped on the loaded page, fail otherwise.
AssertContentTrait::assertField protected function Asserts that a field exists with the given name or ID.
AssertContentTrait::assertFieldById protected function Asserts that a field exists with the given ID and value.
AssertContentTrait::assertFieldByName protected function Asserts that a field exists with the given name and value.
AssertContentTrait::assertFieldByXPath protected function Asserts that a field exists in the current page by the given XPath.
AssertContentTrait::assertFieldChecked protected function Asserts that a checkbox field in the current page is checked.
AssertContentTrait::assertFieldsByValue protected function Asserts that a field exists in the current page with a given Xpath result.
AssertContentTrait::assertLink protected function Passes if a link with the specified label is found.
AssertContentTrait::assertLinkByHref protected function Passes if a link containing a given href (part) is found.
AssertContentTrait::assertNoDuplicateIds protected function Asserts that each HTML ID is used for just a single element.
AssertContentTrait::assertNoEscaped protected function Passes if the raw text IS NOT found escaped on the loaded page, fail otherwise.
AssertContentTrait::assertNoField protected function Asserts that a field does not exist with the given name or ID.
AssertContentTrait::assertNoFieldById protected function Asserts that a field does not exist with the given ID and value.
AssertContentTrait::assertNoFieldByName protected function Asserts that a field does not exist with the given name and value.
AssertContentTrait::assertNoFieldByXPath protected function Asserts that a field does not exist or its value does not match, by XPath.
AssertContentTrait::assertNoFieldChecked protected function Asserts that a checkbox field in the current page is not checked.
AssertContentTrait::assertNoLink protected function Passes if a link with the specified label is not found.
AssertContentTrait::assertNoLinkByHref protected function Passes if a link containing a given href (part) is not found.
AssertContentTrait::assertNoLinkByHrefInMainRegion protected function Passes if a link containing a given href is not found in the main region.
AssertContentTrait::assertNoOption protected function Asserts that a select option in the current page does not exist.
AssertContentTrait::assertNoOptionSelected protected function Asserts that a select option in the current page is not checked.
AssertContentTrait::assertNoPattern protected function Triggers a pass if the perl regex pattern is not found in raw content.
AssertContentTrait::assertNoRaw protected function Passes if the raw text is NOT found on the loaded page, fail otherwise.
AssertContentTrait::assertNoText protected function Passes if the page (with HTML stripped) does not contains the text.
AssertContentTrait::assertNoTitle protected function Pass if the page title is not the given string.
AssertContentTrait::assertNoUniqueText protected function Passes if the text is found MORE THAN ONCE on the text version of the page.
AssertContentTrait::assertOption protected function Asserts that a select option in the current page exists.
AssertContentTrait::assertOptionByText protected function Asserts that a select option with the visible text exists.
AssertContentTrait::assertOptionSelected protected function Asserts that a select option in the current page is checked.
AssertContentTrait::assertOptionSelectedWithDrupalSelector protected function Asserts that a select option in the current page is checked.
AssertContentTrait::assertOptionWithDrupalSelector protected function Asserts that a select option in the current page exists.
AssertContentTrait::assertPattern protected function Triggers a pass if the Perl regex pattern is found in the raw content.
AssertContentTrait::assertRaw protected function Passes if the raw text IS found on the loaded page, fail otherwise.
AssertContentTrait::assertText protected function Passes if the page (with HTML stripped) contains the text.
AssertContentTrait::assertTextHelper protected function Helper for assertText and assertNoText.
AssertContentTrait::assertTextPattern protected function Asserts that a Perl regex pattern is found in the plain-text content.
AssertContentTrait::assertThemeOutput protected function Asserts themed output.
AssertContentTrait::assertTitle protected function Pass if the page title is the given string.
AssertContentTrait::assertUniqueText protected function Passes if the text is found ONLY ONCE on the text version of the page.
AssertContentTrait::assertUniqueTextHelper protected function Helper for assertUniqueText and assertNoUniqueText.
AssertContentTrait::buildXPathQuery protected function Builds an XPath query.
AssertContentTrait::constructFieldXpath protected function Helper: Constructs an XPath for the given set of attributes and value.
AssertContentTrait::cssSelect protected function Searches elements using a CSS selector in the raw content.
AssertContentTrait::getAllOptions protected function Get all option elements, including nested options, in a select.
AssertContentTrait::getDrupalSettings protected function Gets the value of drupalSettings for the currently-loaded page.
AssertContentTrait::getRawContent protected function Gets the current raw content.
AssertContentTrait::getSelectedItem protected function Get the selected value from a select field.
AssertContentTrait::getTextContent protected function Retrieves the plain-text content from the current raw content.
AssertContentTrait::parse protected function Parse content returned from curlExec using DOM and SimpleXML.
AssertContentTrait::removeWhiteSpace protected function Removes all white-space between HTML tags from the raw content.
AssertContentTrait::setDrupalSettings protected function Sets the value of drupalSettings for the currently-loaded page.
AssertContentTrait::setRawContent protected function Sets the raw content (e.g. HTML).
AssertContentTrait::xpath protected function Performs an xpath search on the contents of the internal browser.
ConfigTestTrait::configImporter protected function Returns a ConfigImporter object to import test configuration.
ConfigTestTrait::copyConfig protected function Copies configuration objects from source storage to target storage.
ExtensionListTestTrait::getModulePath protected function Gets the path for the specified module.
ExtensionListTestTrait::getThemePath protected function Gets the path for the specified theme.
FileMigrationTestTrait::prepareMigration protected function
FileMigrationTestTrait::setUpMigratedFiles protected function Setup and execute d6_file migration.
KernelTestBase::$backupGlobals protected property Back up and restore any global variables that may be changed by tests.
KernelTestBase::$backupStaticAttributes protected property Back up and restore static class properties that may be changed by tests.
KernelTestBase::$backupStaticAttributesBlacklist protected property Contains a few static class properties for performance.
KernelTestBase::$classLoader protected property
KernelTestBase::$configImporter protected property @todo Move into Config test base class. 3
KernelTestBase::$configSchemaCheckerExclusions protected static property An array of config object names that are excluded from schema checking.
KernelTestBase::$container protected property
KernelTestBase::$databasePrefix protected property
KernelTestBase::$preserveGlobalState protected property Do not forward any global state from the parent process to the processes that run the actual tests.
KernelTestBase::$root protected property The app root.
KernelTestBase::$runTestInSeparateProcess protected property Kernel tests are run in separate processes because they allow autoloading of code from extensions. Running the test in a separate process isolates this behavior from other tests. Subclasses should not override this property.
KernelTestBase::$siteDirectory protected property
KernelTestBase::$strictConfigSchema protected property Set to TRUE to strict check all configuration saved. 4
KernelTestBase::$vfsRoot protected property The virtual filesystem root directory.
KernelTestBase::assertPostConditions protected function 1
KernelTestBase::bootEnvironment protected function Bootstraps a basic test environment.
KernelTestBase::bootKernel private function Bootstraps a kernel for a test.
KernelTestBase::config protected function Configuration accessor for tests. Returns non-overridden configuration.
KernelTestBase::disableModules protected function Disables modules for this test.
KernelTestBase::enableModules protected function Enables modules for this test.
KernelTestBase::getConfigSchemaExclusions protected function Gets the config schema exclusions for this test.
KernelTestBase::getDatabaseConnectionInfo protected function Returns the Database connection info to be used for this test. 2
KernelTestBase::getDatabasePrefix public function
KernelTestBase::getExtensionsForModules private function Returns Extension objects for $modules to enable.
KernelTestBase::getModulesToEnable private static function Returns the modules to enable for this test.
KernelTestBase::initFileCache protected function Initializes the FileCache component.
KernelTestBase::installConfig protected function Installs default configuration for a given list of modules.
KernelTestBase::installEntitySchema protected function Installs the storage schema for a specific entity type.
KernelTestBase::installSchema protected function Installs database tables from a module schema definition.
KernelTestBase::prepareTemplate protected function
KernelTestBase::register public function Registers test-specific services. Overrides ServiceProviderInterface::register 14
KernelTestBase::render protected function Renders a render array.
KernelTestBase::setInstallProfile protected function Sets the install profile and rebuilds the container to update it.
KernelTestBase::setSetting protected function Sets an in-memory Settings variable.
KernelTestBase::setUpBeforeClass public static function
KernelTestBase::setUpFilesystem protected function Sets up the filesystem, so things like the file directory. 1
KernelTestBase::stop protected function Stops test execution.
KernelTestBase::tearDownCloseDatabaseConnection public function @after
KernelTestBase::vfsDump protected function Dumps the current state of the virtual filesystem to STDOUT.
KernelTestBase::__sleep public function Prevents serializing any properties.
MigrateDrupal6TestBase::getFixtureFilePath protected function Gets the path to the fixture file.
MigrateDrupal6TestBase::migrateContent protected function Executes all content migrations.
MigrateDrupal6TestBase::migrateContentTypes protected function Migrates node types.
MigrateDrupal6TestBase::migrateFields protected function Executes all field migrations.
MigrateDrupal6TestBase::migrateTaxonomy protected function Executes all taxonomy migrations.
MigrateDrupal6TestBase::migrateUsers protected function Executes all user migrations.
MigrateDrupalTestBase::loadFixture protected function Loads a database fixture into the source database connection.
MigrateNodeTest::$modules protected static property Modules to enable. Overrides MigrateDrupal6TestBase::$modules
MigrateNodeTest::rerunMigration protected function Execute the migration a second time.
MigrateNodeTest::setUp protected function Overrides MigrateNodeTestBase::setUp
MigrateNodeTest::testNode public function Tests node migration from Drupal 6 to 8.
MigrateTestBase::$collectMessages protected property TRUE to collect messages instead of displaying them.
MigrateTestBase::$logger protected property A logger prophecy object. 2
MigrateTestBase::$migrateMessages protected property A two dimensional array of messages.
MigrateTestBase::$migration protected property The primary migration being tested.
MigrateTestBase::$sourceDatabase protected property The source database connection.
MigrateTestBase::cleanupMigrateConnection private function Cleans up the test migrate connection.
MigrateTestBase::createMigrationConnection private function Changes the database connection to the prefixed one.
MigrateTestBase::display public function
MigrateTestBase::executeMigration protected function Executes a single migration.
MigrateTestBase::executeMigrations protected function Executes a set of migrations in dependency order.
MigrateTestBase::getMigration protected function Gets the migration plugin.
MigrateTestBase::mockFailure protected function Records a failure in the map table of a specific migration.
MigrateTestBase::prepareMigrations protected function Prepare any dependent migrations.
MigrateTestBase::setTestLogger protected function Injects the test logger into the container.
MigrateTestBase::startCollectingMessages public function Start collecting messages and erase previous messages.
MigrateTestBase::stopCollectingMessages public function Stop collecting messages.
MigrateTestBase::tearDown protected function
NodeMigrateTypeTestTrait::$tableName public property The migrate_map table name.
NodeMigrateTypeTestTrait::getTableName protected function Gets the migrate_map table name.
NodeMigrateTypeTestTrait::makeNodeMigrateMapTable protected function Create a node migrate_map table.
NodeMigrateTypeTestTrait::nodeMigrateMapTableCount protected function Gets the numbers of complete and classic node migrate_map tables.
NodeMigrateTypeTestTrait::removeNodeMigrateMapTable protected function Remove the node migrate map table.
PhpUnitWarnings::$deprecationWarnings private static property Deprecation warnings from PHPUnit to raise with @trigger_error().
PhpUnitWarnings::addWarning public function Converts PHPUnit deprecation warnings to E_USER_DEPRECATED.
RandomGeneratorTrait::$randomGenerator protected property The random generator.
RandomGeneratorTrait::getRandomGenerator protected function Gets the random generator for the utility methods.
RandomGeneratorTrait::randomMachineName protected function Generates a unique random string containing letters and numbers.
RandomGeneratorTrait::randomObject public function Generates a random PHP object.
RandomGeneratorTrait::randomString public function Generates a pseudo-random string of ASCII characters of codes 32 to 126.
RandomGeneratorTrait::randomStringValidate public function Callback for random string validation.
StorageCopyTrait::replaceStorageContents protected static function Copy the configuration from one storage to another and remove stale items.
TestRequirementsTrait::checkModuleRequirements private function Checks missing module requirements.
TestRequirementsTrait::checkRequirements protected function Check module requirements for the Drupal use case.
TestRequirementsTrait::getDrupalRoot protected static function Returns the Drupal root directory.