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class MigrateUserTest in Drupal 8

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

Users migration.

@group user

Hierarchy

Expanded class hierarchy of MigrateUserTest

File

core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php, line 16

Namespace

Drupal\Tests\user\Kernel\Migrate\d7
View source 
class MigrateUserTest extends MigrateDrupal7TestBase {

  /**
   * {@inheritdoc}
   */
  public static $modules = [
    'comment',
    'content_translation',
    'datetime',
    'image',
    'language',
    'link',
    'menu_ui',
    'node',
    'taxonomy',
    'telephone',
    'text',
  ];

  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this
      ->installEntitySchema('comment');
    $this
      ->installEntitySchema('taxonomy_term');
    $this
      ->executeMigration('language');
    $this
      ->migrateFields();
    $this
      ->migrateUsers();
    $this
      ->executeMigrations([
      'd7_entity_translation_settings',
      'd7_user_entity_translation',
    ]);
  }

  /**
   * Asserts various aspects of a user account.
   *
   * @param string $id
   *   The user ID.
   * @param string $label
   *   The username.
   * @param string $mail
   *   The user's email address.
   * @param string $password
   *   The password for this user.
   * @param int $created
   *   The user's creation time.
   * @param int $access
   *   The last access time.
   * @param int $login
   *   The last login time.
   * @param bool $blocked
   *   Whether or not the account is blocked.
   * @param string $entity_langcode
   *   The user entity language code.
   * @param string $prefered_langcode
   *   The user prefered language code.
   * @param string $timezone
   *   The user account's timezone name.
   * @param string $init
   *   The user's initial email address.
   * @param string[] $roles
   *   Role IDs the user account is expected to have.
   * @param int $field_integer
   *   The value of the integer field.
   * @param int|false $field_file_target_id
   *   (optional) The target ID of the file field.
   * @param bool $has_picture
   *   (optional) Whether the user is expected to have a picture attached.
   */
  protected function assertEntity($id, $label, $mail, $password, $created, $access, $login, $blocked, $entity_langcode, $prefered_langcode, $timezone, $init, $roles, $field_integer, $field_file_target_id = FALSE, $has_picture = FALSE) {

    /** @var \Drupal\user\UserInterface $user */
    $user = User::load($id);
    $this
      ->assertInstanceOf(UserInterface::class, $user);
    $this
      ->assertSame($label, $user
      ->label());
    $this
      ->assertSame($mail, $user
      ->getEmail());
    $this
      ->assertSame($password, $user
      ->getPassword());
    $this
      ->assertSame($created, $user
      ->getCreatedTime());
    $this
      ->assertSame($access, $user
      ->getLastAccessedTime());
    $this
      ->assertSame($login, $user
      ->getLastLoginTime());
    $this
      ->assertNotSame($blocked, $user
      ->isBlocked());

    // Ensure the user's langcode, preferred_langcode and
    // preferred_admin_langcode are valid.
    // $user->getPreferredLangcode() might fallback to default language if the
    // user preferred language is not configured on the site. We just want to
    // test if the value was imported correctly.
    $language_manager = $this->container
      ->get('language_manager');
    $default_langcode = $language_manager
      ->getDefaultLanguage()
      ->getId();
    if ($prefered_langcode == '') {
      $this
        ->assertSame('en', $user->langcode->value);
      $this
        ->assertSame($default_langcode, $user->preferred_langcode->value);
      $this
        ->assertSame($default_langcode, $user->preferred_admin_langcode->value);
    }
    elseif ($language_manager
      ->getLanguage($prefered_langcode) === NULL) {
      $this
        ->assertSame($default_langcode, $user->langcode->value);
      $this
        ->assertSame($default_langcode, $user->preferred_langcode->value);
      $this
        ->assertSame($default_langcode, $user->preferred_admin_langcode->value);
    }
    else {
      $this
        ->assertSame($entity_langcode, $user->langcode->value);
      $this
        ->assertSame($prefered_langcode, $user->preferred_langcode->value);
      $this
        ->assertSame($prefered_langcode, $user->preferred_admin_langcode->value);
    }
    $this
      ->assertSame($timezone, $user
      ->getTimeZone());
    $this
      ->assertSame($init, $user
      ->getInitialEmail());
    $this
      ->assertSame($roles, $user
      ->getRoles());
    $this
      ->assertSame($has_picture, !$user->user_picture
      ->isEmpty());
    if (!is_null($field_integer)) {
      $this
        ->assertTrue($user
        ->hasField('field_integer'));
      $this
        ->assertEquals($field_integer[0], $user->field_integer->value);
    }
    if (!empty($field_file_target_id)) {
      $this
        ->assertTrue($user
        ->hasField('field_file'));
      $this
        ->assertSame($field_file_target_id, $user->field_file->target_id);
    }
  }

  /**
   * Tests the Drupal 7 user to Drupal 8 migration.
   */
  public function testUser() {
    $users = Database::getConnection('default', 'migrate')
      ->select('users', 'u')
      ->fields('u')
      ->condition('uid', 1, '>')
      ->execute()
      ->fetchAll();
    foreach ($users as $source) {
      $rids = Database::getConnection('default', 'migrate')
        ->select('users_roles', 'ur')
        ->fields('ur', [
        'rid',
      ])
        ->condition('ur.uid', $source->uid)
        ->execute()
        ->fetchCol();
      $roles = [
        RoleInterface::AUTHENTICATED_ID,
      ];
      $id_map = $this
        ->getMigration('d7_user_role')
        ->getIdMap();
      foreach ($rids as $rid) {
        $role = $id_map
          ->lookupDestinationIds([
          $rid,
        ])[0];
        $roles[] = reset($role);
      }
      $entity_translation = Database::getConnection('default', 'migrate')
        ->select('entity_translation', 'et')
        ->fields('et', [
        'language',
      ])
        ->condition('et.entity_type', 'user')
        ->condition('et.entity_id', $source->uid)
        ->condition('et.source', '')
        ->execute()
        ->fetchField();
      $entity_language = $entity_translation ?: $source->language;
      $field_integer = Database::getConnection('default', 'migrate')
        ->select('field_data_field_integer', 'fi')
        ->fields('fi', [
        'field_integer_value',
      ])
        ->condition('fi.entity_id', $source->uid)
        ->condition('fi.language', $entity_language)
        ->execute()
        ->fetchCol();
      $field_integer = !empty($field_integer) ? $field_integer : NULL;
      $field_file = Database::getConnection('default', 'migrate')
        ->select('field_data_field_file', 'ff')
        ->fields('ff', [
        'field_file_fid',
      ])
        ->condition('ff.entity_id', $source->uid)
        ->execute()
        ->fetchField();
      $this
        ->assertEntity($source->uid, $source->name, $source->mail, $source->pass, $source->created, $source->access, $source->login, $source->status, $entity_language, $source->language, $source->timezone, $source->init, $roles, $field_integer, $field_file);

      // Ensure that the user can authenticate.
      $this
        ->assertEquals($source->uid, $this->container
        ->get('user.auth')
        ->authenticate($source->name, 'a password'));

      // After authenticating the password will be rehashed because the password
      // stretching iteration count has changed from 15 in Drupal 7 to 16 in
      // Drupal 8.
      $user = User::load($source->uid);
      $rehash = $user
        ->getPassword();
      $this
        ->assertNotEquals($source->pass, $rehash);

      // Authenticate again and there should be no re-hash.
      $this
        ->assertEquals($source->uid, $this->container
        ->get('user.auth')
        ->authenticate($source->name, 'a password'));
      $user = User::load($source->uid);
      $this
        ->assertEquals($rehash, $user
        ->getPassword());
    }
  }

  /**
   * Tests the Drupal 7 user entity translations to Drupal 8 migration.
   */
  public function testUserEntityTranslations() {
    $manager = $this->container
      ->get('content_translation.manager');

    // Get the user and its translations.
    $user = User::load(2);
    $user_fr = $user
      ->getTranslation('fr');
    $user_is = $user
      ->getTranslation('is');

    // Test that fields translated with Entity Translation are migrated.
    $this
      ->assertSame('99', $user->field_integer->value);
    $this
      ->assertSame('9', $user_fr->field_integer->value);
    $this
      ->assertSame('1', $user_is->field_integer->value);

    // Test that the French translation metadata is correctly migrated.
    $metadata_fr = $manager
      ->getTranslationMetadata($user_fr);
    $this
      ->assertSame('en', $metadata_fr
      ->getSource());
    $this
      ->assertSame('1', $metadata_fr
      ->getAuthor()->uid->value);
    $this
      ->assertSame('1531663916', $metadata_fr
      ->getCreatedTime());
    $this
      ->assertFalse($metadata_fr
      ->isOutdated());
    $this
      ->assertFalse($metadata_fr
      ->isPublished());

    // Test that the Icelandic translation metadata is correctly migrated.
    $metadata_is = $manager
      ->getTranslationMetadata($user_is);
    $this
      ->assertSame('en', $metadata_is
      ->getSource());
    $this
      ->assertSame('2', $metadata_is
      ->getAuthor()->uid->value);
    $this
      ->assertSame('1531663925', $metadata_is
      ->getCreatedTime());
    $this
      ->assertTrue($metadata_is
      ->isOutdated());
    $this
      ->assertTrue($metadata_is
      ->isPublished());

    // Test that untranslatable properties are the same as the source language.
    $this
      ->assertSame($user
      ->label(), $user_fr
      ->label());
    $this
      ->assertSame($user
      ->label(), $user_is
      ->label());
    $this
      ->assertSame($user
      ->getEmail(), $user_fr
      ->getEmail());
    $this
      ->assertSame($user
      ->getEmail(), $user_is
      ->getEmail());
    $this
      ->assertSame($user
      ->getPassword(), $user_fr
      ->getPassword());
    $this
      ->assertSame($user
      ->getPassword(), $user_is
      ->getPassword());
  }

}

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::getUrl protected function Get the current URL from the cURL handler. 1
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.
AssertHelperTrait::castSafeStrings protected static function Casts MarkupInterface objects into strings.
AssertLegacyTrait::assert protected function Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertTrue() instead.
AssertLegacyTrait::assertEqual protected function Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertEquals() instead.
AssertLegacyTrait::assertIdentical protected function Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertSame() instead.
AssertLegacyTrait::assertIdenticalObject protected function Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertEquals() instead.
AssertLegacyTrait::assertNotEqual protected function Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertNotEquals() instead.
AssertLegacyTrait::assertNotIdentical protected function Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertNotSame() instead.
AssertLegacyTrait::pass protected function Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertTrue() instead.
AssertLegacyTrait::verbose protected function
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.
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. 7
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. 6
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. 1
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::isTestInIsolation Deprecated protected function Returns whether the current test method is running in a separate process.
KernelTestBase::prepareTemplate protected function
KernelTestBase::register public function Registers test-specific services. Overrides ServiceProviderInterface::register 26
KernelTestBase::render protected function Renders a render array. 1
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 1
KernelTestBase::setUpFilesystem protected function Sets up the filesystem, so things like the file directory. 2
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::__get Deprecated public function BC: Automatically resolve former KernelTestBase class properties.
KernelTestBase::__sleep public function Prevents serializing any properties.
MigrateDrupal7TestBase::getFixtureFilePath protected function Gets the path to the fixture file.
MigrateDrupal7TestBase::migrateCommentTypes protected function Migrates comment types.
MigrateDrupal7TestBase::migrateContent protected function Executes all content migrations.
MigrateDrupal7TestBase::migrateContentTypes protected function Migrates node types.
MigrateDrupal7TestBase::migrateFields protected function Executes all field migrations.
MigrateDrupal7TestBase::migrateTaxonomyTerms protected function Executes all taxonomy term migrations.
MigrateDrupal7TestBase::migrateUsers protected function Executes all user migrations.
MigrateDrupalTestBase::loadFixture protected function Loads a database fixture into the source database connection.
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::$migration protected property The primary migration being tested. 1
MigrateTestBase::$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 Displays a migrate message. Overrides MigrateMessageInterface::display
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::prepareMigration protected function Modify a migration's configuration before executing it.
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 Overrides KernelTestBase::tearDown
MigrateUserTest::$modules public static property Modules to enable. Overrides MigrateDrupalTestBase::$modules
MigrateUserTest::assertEntity protected function Asserts various aspects of a user account.
MigrateUserTest::setUp protected function Overrides MigrateDrupal7TestBase::setUp
MigrateUserTest::testUser public function Tests the Drupal 7 user to Drupal 8 migration.
MigrateUserTest::testUserEntityTranslations public function Tests the Drupal 7 user entity translations to Drupal 8 migration.
NodeMigrateTypeTestTrait::$tableName public property The migrate_map table name.
NodeMigrateTypeTestTrait::getTableName protected function Gets the migrate_map table name.
NodeMigrateTypeTestTrait::makeNodeMigrateMapTable protected function Create a node migrate_map table.
NodeMigrateTypeTestTrait::nodeMigrateMapTableCount protected function Gets the numbers of complete and classic node migrate_map tables.
NodeMigrateTypeTestTrait::removeNodeMigrateMapTable protected function Remove the node migrate map table.
PhpunitCompatibilityTrait::getMock Deprecated public function Returns a mock object for the specified class using the available method.
PhpunitCompatibilityTrait::setExpectedException Deprecated public function Compatibility layer for PHPUnit 6 to support PHPUnit 4 code.
RandomGeneratorTrait::$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. 1
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. 1
TestRequirementsTrait::getDrupalRoot protected static function Returns the Drupal root directory.