comparison core/modules/simpletest/src/TestBase.php @ 0:c75dbcec494b

Initial commit from drush-created site

+<?php
+
+namespace Drupal\simpletest;
+
+use Drupal\Component\Assertion\Handle;
+use Drupal\Component\Render\MarkupInterface;
+use Drupal\Component\Utility\Crypt;
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\Core\Database\Database;
+use Drupal\Core\Site\Settings;
+use Drupal\Core\StreamWrapper\PublicStream;
+use Drupal\Core\Test\TestDatabase;
+use Drupal\Core\Test\TestSetupTrait;
+use Drupal\Core\Utility\Error;
+use Drupal\Tests\AssertHelperTrait as BaseAssertHelperTrait;
+use Drupal\Tests\ConfigTestTrait;
+use Drupal\Tests\RandomGeneratorTrait;
+use Drupal\Tests\SessionTestTrait;
+use Drupal\Tests\Traits\Core\GeneratePermutationsTrait;
+
+/**
+ * Base class for Drupal tests.
+ *
+ * Do not extend this class directly; use \Drupal\simpletest\WebTestBase.
+ */
+abstract class TestBase {
+
+  use BaseAssertHelperTrait;
+  use TestSetupTrait;
+  use SessionTestTrait;
+  use RandomGeneratorTrait;
+  use GeneratePermutationsTrait;
+  // For backwards compatibility switch the visbility of the methods to public.
+  use ConfigTestTrait {
+    configImporter as public;
+    copyConfig as public;
+  }
+
+  /**
+   * The database prefix of this test run.
+   *
+   * @var string
+   */
+  protected $databasePrefix = NULL;
+
+  /**
+   * Time limit for the test.
+   *
+   * @var int
+   */
+  protected $timeLimit = 500;
+
+  /**
+   * Current results of this test case.
+   *
+   * @var Array
+   */
+  public $results = [
+    '#pass' => 0,
+    '#fail' => 0,
+    '#exception' => 0,
+    '#debug' => 0,
+  ];
+
+  /**
+   * Assertions thrown in that test case.
+   *
+   * @var Array
+   */
+  protected $assertions = [];
+
+  /**
+   * This class is skipped when looking for the source of an assertion.
+   *
+   * When displaying which function an assert comes from, it's not too useful
+   * to see "WebTestBase->drupalLogin()', we would like to see the test
+   * that called it. So we need to skip the classes defining these helper
+   * methods.
+   */
+  protected $skipClasses = [__CLASS__ => TRUE];
+
+  /**
+   * TRUE if verbose debugging is enabled.
+   *
+   * @var bool
+   */
+  public $verbose;
+
+  /**
+   * Incrementing identifier for verbose output filenames.
+   *
+   * @var int
+   */
+  protected $verboseId = 0;
+
+  /**
+   * Safe class name for use in verbose output filenames.
+   *
+   * Namespaces separator (\) replaced with _.
+   *
+   * @var string
+   */
+  protected $verboseClassName;
+
+  /**
+   * Directory where verbose output files are put.
+   *
+   * @var string
+   */
+  protected $verboseDirectory;
+
+  /**
+   * URL to the verbose output file directory.
+   *
+   * @var string
+   */
+  protected $verboseDirectoryUrl;
+
+  /**
+   * The original configuration (variables), if available.
+   *
+   * @var string
+   * @todo Remove all remnants of $GLOBALS['conf'].
+   * @see https://www.drupal.org/node/2183323
+   */
+  protected $originalConf;
+
+  /**
+   * The original configuration (variables).
+   *
+   * @var string
+   */
+  protected $originalConfig;
+
+  /**
+   * The original configuration directories.
+   *
+   * An array of paths keyed by the CONFIG_*_DIRECTORY constants defined by
+   * core/includes/bootstrap.inc.
+   *
+   * @var array
+   */
+  protected $originalConfigDirectories;
+
+  /**
+   * The original container.
+   *
+   * @var \Symfony\Component\DependencyInjection\ContainerInterface
+   */
+  protected $originalContainer;
+
+  /**
+   * The original file directory, before it was changed for testing purposes.
+   *
+   * @var string
+   */
+  protected $originalFileDirectory = NULL;
+
+  /**
+   * The original language.
+   *
+   * @var \Drupal\Core\Language\LanguageInterface
+   */
+  protected $originalLanguage;
+
+  /**
+   * The original database prefix when running inside Simpletest.
+   *
+   * @var string
+   */
+  protected $originalPrefix;
+
+  /**
+   * The name of the session cookie of the test-runner.
+   *
+   * @var string
+   */
+  protected $originalSessionName;
+
+  /**
+   * The settings array.
+   *
+   * @var array
+   */
+  protected $originalSettings;
+
+  /**
+   * The original array of shutdown function callbacks.
+   *
+   * @var array
+   */
+  protected $originalShutdownCallbacks;
+
+  /**
+   * The original user, before testing began.
+   *
+   * @var \Drupal\Core\Session\AccountProxyInterface
+   */
+  protected $originalUser;
+
+  /**
+   * The translation file directory for the test environment.
+   *
+   * This is set in TestBase::prepareEnvironment().
+   *
+   * @var string
+   */
+  protected $translationFilesDirectory;
+
+  /**
+   * Whether to die in case any test assertion fails.
+   *
+   * @var bool
+   *
+   * @see run-tests.sh
+   */
+  public $dieOnFail = FALSE;
+
+  /**
+   * The config importer that can used in a test.
+   *
+   * @var \Drupal\Core\Config\ConfigImporter
+   */
+  protected $configImporter;
+
+  /**
+   * HTTP authentication method (specified as a CURLAUTH_* constant).
+   *
+   * @var int
+   * @see http://php.net/manual/function.curl-setopt.php
+   */
+  protected $httpAuthMethod = CURLAUTH_BASIC;
+
+  /**
+   * HTTP authentication credentials (<username>:<password>).
+   *
+   * @var string
+   */
+  protected $httpAuthCredentials = NULL;
+
+  /**
+   * Constructor for Test.
+   *
+   * @param $test_id
+   *   Tests with the same id are reported together.
+   */
+  public function __construct($test_id = NULL) {
+    $this->testId = $test_id;
+  }
+
+  /**
+   * Performs setup tasks before each individual test method is run.
+   */
+  abstract protected function setUp();
+
+  /**
+   * Checks the matching requirements for Test.
+   *
+   * @return
+   *   Array of errors containing a list of unmet requirements.
+   */
+  protected function checkRequirements() {
+    return [];
+  }
+
+  /**
+   * Helper method to store an assertion record in the configured database.
+   *
+   * This method decouples database access from assertion logic.
+   *
+   * @param array $assertion
+   *   Keyed array representing an assertion, as generated by assert().
+   *
+   * @see self::assert()
+   *
+   * @return \Drupal\Core\Database\StatementInterface|int|null
+   *   The message ID.
+   */
+  protected function storeAssertion(array $assertion) {
+    return self::getDatabaseConnection()
+      ->insert('simpletest', ['return' => Database::RETURN_INSERT_ID])
+      ->fields($assertion)
+      ->execute();
+  }
+
+  /**
+   * Internal helper: stores the assert.
+   *
+   * @param $status
+   *   Can be 'pass', 'fail', 'exception', 'debug'.
+   *   TRUE is a synonym for 'pass', FALSE for 'fail'.
+   * @param string|\Drupal\Component\Render\MarkupInterface $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   * @param $caller
+   *   By default, the assert comes from a function whose name starts with
+   *   'test'. Instead, you can specify where this assert originates from
+   *   by passing in an associative array as $caller. Key 'file' is
+   *   the name of the source file, 'line' is the line number and 'function'
+   *   is the caller function itself.
+   */
+  protected function assert($status, $message = '', $group = 'Other', array $caller = NULL) {
+    if ($message instanceof MarkupInterface) {
+      $message = (string) $message;
+    }
+    // Convert boolean status to string status.
+    if (is_bool($status)) {
+      $status = $status ? 'pass' : 'fail';
+    }
+
+    // Increment summary result counter.
+    $this->results['#' . $status]++;
+
+    // Get the function information about the call to the assertion method.
+    if (!$caller) {
+      $caller = $this->getAssertionCall();
+    }
+
+    // Creation assertion array that can be displayed while tests are running.
+    $assertion = [
+      'test_id' => $this->testId,
+      'test_class' => get_class($this),
+      'status' => $status,
+      'message' => $message,
+      'message_group' => $group,
+      'function' => $caller['function'],
+      'line' => $caller['line'],
+      'file' => $caller['file'],
+    ];
+
+    // Store assertion for display after the test has completed.
+    $message_id = $this->storeAssertion($assertion);
+    $assertion['message_id'] = $message_id;
+    $this->assertions[] = $assertion;
+
+    // We do not use a ternary operator here to allow a breakpoint on
+    // test failure.
+    if ($status == 'pass') {
+      return TRUE;
+    }
+    else {
+      if ($this->dieOnFail && ($status == 'fail' || $status == 'exception')) {
+        exit(1);
+      }
+      return FALSE;
+    }
+  }
+
+  /**
+   * Store an assertion from outside the testing context.
+   *
+   * This is useful for inserting assertions that can only be recorded after
+   * the test case has been destroyed, such as PHP fatal errors. The caller
+   * information is not automatically gathered since the caller is most likely
+   * inserting the assertion on behalf of other code. In all other respects
+   * the method behaves just like \Drupal\simpletest\TestBase::assert() in terms
+   * of storing the assertion.
+   *
+   * @return
+   *   Message ID of the stored assertion.
+   *
+   * @see \Drupal\simpletest\TestBase::assert()
+   * @see \Drupal\simpletest\TestBase::deleteAssert()
+   */
+  public static function insertAssert($test_id, $test_class, $status, $message = '', $group = 'Other', array $caller = []) {
+    // Convert boolean status to string status.
+    if (is_bool($status)) {
+      $status = $status ? 'pass' : 'fail';
+    }
+
+    $caller += [
+      'function' => 'Unknown',
+      'line' => 0,
+      'file' => 'Unknown',
+    ];
+
+    $assertion = [
+      'test_id' => $test_id,
+      'test_class' => $test_class,
+      'status' => $status,
+      'message' => $message,
+      'message_group' => $group,
+      'function' => $caller['function'],
+      'line' => $caller['line'],
+      'file' => $caller['file'],
+    ];
+
+    // We can't use storeAssertion() because this method is static.
+    return self::getDatabaseConnection()
+      ->insert('simpletest')
+      ->fields($assertion)
+      ->execute();
+  }
+
+  /**
+   * Delete an assertion record by message ID.
+   *
+   * @param $message_id
+   *   Message ID of the assertion to delete.
+   *
+   * @return
+   *   TRUE if the assertion was deleted, FALSE otherwise.
+   *
+   * @see \Drupal\simpletest\TestBase::insertAssert()
+   */
+  public static function deleteAssert($message_id) {
+    // We can't use storeAssertion() because this method is static.
+    return (bool) self::getDatabaseConnection()
+      ->delete('simpletest')
+      ->condition('message_id', $message_id)
+      ->execute();
+  }
+
+  /**
+   * Cycles through backtrace until the first non-assertion method is found.
+   *
+   * @return
+   *   Array representing the true caller.
+   */
+  protected function getAssertionCall() {
+    $backtrace = debug_backtrace();
+
+    // The first element is the call. The second element is the caller.
+    // We skip calls that occurred in one of the methods of our base classes
+    // or in an assertion function.
+    while (($caller = $backtrace[1]) &&
+         ((isset($caller['class']) && isset($this->skipClasses[$caller['class']])) ||
+           substr($caller['function'], 0, 6) == 'assert')) {
+      // We remove that call.
+      array_shift($backtrace);
+    }
+
+    return Error::getLastCaller($backtrace);
+  }
+
+  /**
+   * Check to see if a value is not false.
+   *
+   * False values are: empty string, 0, NULL, and FALSE.
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertTrue($value, $message = '', $group = 'Other') {
+    return $this->assert((bool) $value, $message ? $message : SafeMarkup::format('Value @value is TRUE.', ['@value' => var_export($value, TRUE)]), $group);
+  }
+
+  /**
+   * Check to see if a value is false.
+   *
+   * False values are: empty string, 0, NULL, and FALSE.
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertFalse($value, $message = '', $group = 'Other') {
+    return $this->assert(!$value, $message ? $message : SafeMarkup::format('Value @value is FALSE.', ['@value' => var_export($value, TRUE)]), $group);
+  }
+
+  /**
+   * Check to see if a value is NULL.
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNull($value, $message = '', $group = 'Other') {
+    return $this->assert(!isset($value), $message ? $message : SafeMarkup::format('Value @value is NULL.', ['@value' => var_export($value, TRUE)]), $group);
+  }
+
+  /**
+   * Check to see if a value is not NULL.
+   *
+   * @param $value
+   *   The value on which the assertion is to be done.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNotNull($value, $message = '', $group = 'Other') {
+    return $this->assert(isset($value), $message ? $message : SafeMarkup::format('Value @value is not NULL.', ['@value' => var_export($value, TRUE)]), $group);
+  }
+
+  /**
+   * Check to see if two values are equal.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertEqual($first, $second, $message = '', $group = 'Other') {
+    // Cast objects implementing MarkupInterface to string instead of
+    // relying on PHP casting them to string depending on what they are being
+    // comparing with.
+    $first = $this->castSafeStrings($first);
+    $second = $this->castSafeStrings($second);
+    $is_equal = $first == $second;
+    if (!$is_equal || !$message) {
+      $default_message = SafeMarkup::format('Value @first is equal to value @second.', ['@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE)]);
+      $message = $message ? $message . PHP_EOL . $default_message : $default_message;
+    }
+    return $this->assert($is_equal, $message, $group);
+  }
+
+  /**
+   * Check to see if two values are not equal.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNotEqual($first, $second, $message = '', $group = 'Other') {
+    // Cast objects implementing MarkupInterface to string instead of
+    // relying on PHP casting them to string depending on what they are being
+    // comparing with.
+    $first = $this->castSafeStrings($first);
+    $second = $this->castSafeStrings($second);
+    $not_equal = $first != $second;
+    if (!$not_equal || !$message) {
+      $default_message = SafeMarkup::format('Value @first is not equal to value @second.', ['@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE)]);
+      $message = $message ? $message . PHP_EOL . $default_message : $default_message;
+    }
+    return $this->assert($not_equal, $message, $group);
+  }
+
+  /**
+   * Check to see if two values are identical.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertIdentical($first, $second, $message = '', $group = 'Other') {
+    $is_identical = $first === $second;
+    if (!$is_identical || !$message) {
+      $default_message = SafeMarkup::format('Value @first is identical to value @second.', ['@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE)]);
+      $message = $message ? $message . PHP_EOL . $default_message : $default_message;
+    }
+    return $this->assert($is_identical, $message, $group);
+  }
+
+  /**
+   * Check to see if two values are not identical.
+   *
+   * @param $first
+   *   The first value to check.
+   * @param $second
+   *   The second value to check.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertNotIdentical($first, $second, $message = '', $group = 'Other') {
+    $not_identical = $first !== $second;
+    if (!$not_identical || !$message) {
+      $default_message = SafeMarkup::format('Value @first is not identical to value @second.', ['@first' => var_export($first, TRUE), '@second' => var_export($second, TRUE)]);
+      $message = $message ? $message . PHP_EOL . $default_message : $default_message;
+    }
+    return $this->assert($not_identical, $message, $group);
+  }
+
+  /**
+   * Checks to see if two objects are identical.
+   *
+   * @param object $object1
+   *   The first object to check.
+   * @param object $object2
+   *   The second object to check.
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   */
+  protected function assertIdenticalObject($object1, $object2, $message = '', $group = 'Other') {
+    $message = $message ?: SafeMarkup::format('@object1 is identical to @object2', [
+      '@object1' => var_export($object1, TRUE),
+      '@object2' => var_export($object2, TRUE),
+    ]);
+    $identical = TRUE;
+    foreach ($object1 as $key => $value) {
+      $identical = $identical && isset($object2->$key) && $object2->$key === $value;
+    }
+    return $this->assertTrue($identical, $message, $group);
+  }
+
+  /**
+   * Asserts that no errors have been logged to the PHP error.log thus far.
+   *
+   * @return bool
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   *
+   * @see \Drupal\simpletest\TestBase::prepareEnvironment()
+   * @see \Drupal\Core\DrupalKernel::bootConfiguration()
+   */
+  protected function assertNoErrorsLogged() {
+    // Since PHP only creates the error.log file when an actual error is
+    // triggered, it is sufficient to check whether the file exists.
+    return $this->assertFalse(file_exists(DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log'), 'PHP error.log is empty.');
+  }
+
+  /**
+   * Asserts that a specific error has been logged to the PHP error log.
+   *
+   * @param string $error_message
+   *   The expected error message.
+   *
+   * @return bool
+   *   TRUE if the assertion succeeded, FALSE otherwise.
+   *
+   * @see \Drupal\simpletest\TestBase::prepareEnvironment()
+   * @see \Drupal\Core\DrupalKernel::bootConfiguration()
+   */
+  protected function assertErrorLogged($error_message) {
+    $error_log_filename = DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log';
+    if (!file_exists($error_log_filename)) {
+      $this->error('No error logged yet.');
+    }
+
+    $content = file_get_contents($error_log_filename);
+    $rows = explode(PHP_EOL, $content);
+
+    // We iterate over the rows in order to be able to remove the logged error
+    // afterwards.
+    $found = FALSE;
+    foreach ($rows as $row_index => $row) {
+      if (strpos($content, $error_message) !== FALSE) {
+        $found = TRUE;
+        unset($rows[$row_index]);
+      }
+    }
+
+    file_put_contents($error_log_filename, implode("\n", $rows));
+
+    return $this->assertTrue($found, sprintf('The %s error message was logged.', $error_message));
+  }
+
+  /**
+   * Fire an assertion that is always positive.
+   *
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   TRUE.
+   */
+  protected function pass($message = NULL, $group = 'Other') {
+    return $this->assert(TRUE, $message, $group);
+  }
+
+  /**
+   * Fire an assertion that is always negative.
+   *
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   *
+   * @return
+   *   FALSE.
+   */
+  protected function fail($message = NULL, $group = 'Other') {
+    return $this->assert(FALSE, $message, $group);
+  }
+
+  /**
+   * Fire an error assertion.
+   *
+   * @param $message
+   *   (optional) A message to display with the assertion. Do not translate
+   *   messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+   *   variables in the message text, not t(). If left blank, a default message
+   *   will be displayed.
+   * @param $group
+   *   (optional) The group this message is in, which is displayed in a column
+   *   in test output. Use 'Debug' to indicate this is debugging output. Do not
+   *   translate this string. Defaults to 'Other'; most tests do not override
+   *   this default.
+   * @param $caller
+   *   The caller of the error.
+   *
+   * @return
+   *   FALSE.
+   */
+  protected function error($message = '', $group = 'Other', array $caller = NULL) {
+    if ($group == 'User notice') {
+      // Since 'User notice' is set by trigger_error() which is used for debug
+      // set the message to a status of 'debug'.
+      return $this->assert('debug', $message, 'Debug', $caller);
+    }
+
+    return $this->assert('exception', $message, $group, $caller);
+  }
+
+  /**
+   * Logs a verbose message in a text file.
+   *
+   * The link to the verbose message will be placed in the test results as a
+   * passing assertion with the text '[verbose message]'.
+   *
+   * @param $message
+   *   The verbose message to be stored.
+   *
+   * @see simpletest_verbose()
+   */
+  protected function verbose($message) {
+    // Do nothing if verbose debugging is disabled.
+    if (!$this->verbose) {
+      return;
+    }
+
+    $message = '<hr />ID #' . $this->verboseId . ' (<a href="' . $this->verboseClassName . '-' . ($this->verboseId - 1) . '-' . $this->testId . '.html">Previous</a> | <a href="' . $this->verboseClassName . '-' . ($this->verboseId + 1) . '-' . $this->testId . '.html">Next</a>)<hr />' . $message;
+    $verbose_filename = $this->verboseClassName . '-' . $this->verboseId . '-' . $this->testId . '.html';
+    if (file_put_contents($this->verboseDirectory . '/' . $verbose_filename, $message)) {
+      $url = $this->verboseDirectoryUrl . '/' . $verbose_filename;
+      // Not using \Drupal\Core\Utility\LinkGeneratorInterface::generate()
+      // to avoid invoking the theme system, so that unit tests
+      // can use verbose() as well.
+      $url = '<a href="' . $url . '" target="_blank">Verbose message</a>';
+      $this->error($url, 'User notice');
+    }
+    $this->verboseId++;
+  }
+
+  /**
+   * Run all tests in this class.
+   *
+   * Regardless of whether $methods are passed or not, only method names
+   * starting with "test" are executed.
+   *
+   * @param $methods
+   *   (optional) A list of method names in the test case class to run; e.g.,
+   *   array('testFoo', 'testBar'). By default, all methods of the class are
+   *   taken into account, but it can be useful to only run a few selected test
+   *   methods during debugging.
+   */
+  public function run(array $methods = []) {
+    $class = get_class($this);
+
+    if ($missing_requirements = $this->checkRequirements()) {
+      $object_info = new \ReflectionObject($this);
+      $caller = [
+        'file' => $object_info->getFileName(),
+      ];
+      foreach ($missing_requirements as $missing_requirement) {
+        TestBase::insertAssert($this->testId, $class, FALSE, $missing_requirement, 'Requirements check', $caller);
+      }
+      return;
+    }
+
+    TestServiceProvider::$currentTest = $this;
+    $simpletest_config = $this->config('simpletest.settings');
+
+    // Unless preset from run-tests.sh, retrieve the current verbose setting.
+    if (!isset($this->verbose)) {
+      $this->verbose = $simpletest_config->get('verbose');
+    }
+
+    if ($this->verbose) {
+      // Initialize verbose debugging.
+      $this->verbose = TRUE;
+      $this->verboseDirectory = PublicStream::basePath() . '/simpletest/verbose';
+      $this->verboseDirectoryUrl = file_create_url($this->verboseDirectory);
+      if (file_prepare_directory($this->verboseDirectory, FILE_CREATE_DIRECTORY) && !file_exists($this->verboseDirectory . '/.htaccess')) {
+        file_put_contents($this->verboseDirectory . '/.htaccess', "<IfModule mod_expires.c>\nExpiresActive Off\n</IfModule>\n");
+      }
+      $this->verboseClassName = str_replace("\\", "_", $class);
+    }
+    // HTTP auth settings (<username>:<password>) for the simpletest browser
+    // when sending requests to the test site.
+    $this->httpAuthMethod = (int) $simpletest_config->get('httpauth.method');
+    $username = $simpletest_config->get('httpauth.username');
+    $password = $simpletest_config->get('httpauth.password');
+    if (!empty($username) && !empty($password)) {
+      $this->httpAuthCredentials = $username . ':' . $password;
+    }
+
+    // Force assertion failures to be thrown as AssertionError for PHP 5 & 7
+    // compatibility.
+    Handle::register();
+
+    set_error_handler([$this, 'errorHandler']);
+    // Iterate through all the methods in this class, unless a specific list of
+    // methods to run was passed.
+    $test_methods = array_filter(get_class_methods($class), function ($method) {
+      return strpos($method, 'test') === 0;
+    });
+    if (empty($test_methods)) {
+      // Call $this->assert() here because we need to pass along custom caller
+      // information, lest the wrong originating code file/line be identified.
+      $this->assert(FALSE, 'No test methods found.', 'Requirements', ['function' => __METHOD__ . '()', 'file' => __FILE__, 'line' => __LINE__]);
+    }
+    if ($methods) {
+      $test_methods = array_intersect($test_methods, $methods);
+    }
+    foreach ($test_methods as $method) {
+      // Insert a fail record. This will be deleted on completion to ensure
+      // that testing completed.
+      $method_info = new \ReflectionMethod($class, $method);
+      $caller = [
+        'file' => $method_info->getFileName(),
+        'line' => $method_info->getStartLine(),
+        'function' => $class . '->' . $method . '()',
+      ];
+      $test_completion_check_id = TestBase::insertAssert($this->testId, $class, FALSE, 'The test did not complete due to a fatal error.', 'Completion check', $caller);
+
+      try {
+        $this->prepareEnvironment();
+      }
+      catch (\Exception $e) {
+        $this->exceptionHandler($e);
+        // The prepareEnvironment() method isolates the test from the parent
+        // Drupal site by creating a random database prefix and test site
+        // directory. If this fails, a test would possibly operate in the
+        // parent site. Therefore, the entire test run for this test class
+        // has to be aborted.
+        // restoreEnvironment() cannot be called, because we do not know
+        // where exactly the environment setup failed.
+        break;
+      }
+
+      try {
+        $this->setUp();
+      }
+      catch (\Exception $e) {
+        $this->exceptionHandler($e);
+        // Abort if setUp() fails, since all test methods will fail.
+        // But ensure to clean up and restore the environment, since
+        // prepareEnvironment() succeeded.
+        $this->restoreEnvironment();
+        break;
+      }
+      try {
+        $this->$method();
+      }
+      catch (\Exception $e) {
+        $this->exceptionHandler($e);
+      }
+      try {
+        $this->tearDown();
+      }
+      catch (\Exception $e) {
+        $this->exceptionHandler($e);
+        // If a test fails to tear down, abort the entire test class, since
+        // it is likely that all tests will fail in the same way and a
+        // failure here only results in additional test artifacts that have
+        // to be manually deleted.
+        $this->restoreEnvironment();
+        break;
+      }
+
+      $this->restoreEnvironment();
+      // Remove the test method completion check record.
+      TestBase::deleteAssert($test_completion_check_id);
+    }
+
+    TestServiceProvider::$currentTest = NULL;
+    // Clear out the error messages and restore error handler.
+    drupal_get_messages();
+    restore_error_handler();
+  }
+
+  /**
+   * Generates a database prefix for running tests.
+   *
+   * The database prefix is used by prepareEnvironment() to setup a public files
+   * directory for the test to be run, which also contains the PHP error log,
+   * which is written to in case of a fatal error. Since that directory is based
+   * on the database prefix, all tests (even unit tests) need to have one, in
+   * order to access and read the error log.
+   *
+   * @see TestBase::prepareEnvironment()
+   *
+   * The generated database table prefix is used for the Drupal installation
+   * being performed for the test. It is also used as user agent HTTP header
+   * value by the cURL-based browser of WebTestBase, which is sent to the Drupal
+   * installation of the test. During early Drupal bootstrap, the user agent
+   * HTTP header is parsed, and if it matches, all database queries use the
+   * database table prefix that has been generated here.
+   *
+   * @see WebTestBase::curlInitialize()
+   * @see drupal_valid_test_ua()
+   */
+  private function prepareDatabasePrefix() {
+    $test_db = new TestDatabase();
+    $this->siteDirectory = $test_db->getTestSitePath();
+    $this->databasePrefix = $test_db->getDatabasePrefix();
+
+    // As soon as the database prefix is set, the test might start to execute.
+    // All assertions as well as the SimpleTest batch operations are associated
+    // with the testId, so the database prefix has to be associated with it.
+    $affected_rows = self::getDatabaseConnection()->update('simpletest_test_id')
+      ->fields(['last_prefix' => $this->databasePrefix])
+      ->condition('test_id', $this->testId)
+      ->execute();
+    if (!$affected_rows) {
+      throw new \RuntimeException('Failed to set up database prefix.');
+    }
+  }
+
+  /**
+   * Act on global state information before the environment is altered for a test.
+   *
+   * Allows e.g. KernelTestBase to prime system/extension info from the
+   * parent site (and inject it into the test environment so as to improve
+   * performance).
+   */
+  protected function beforePrepareEnvironment() {
+  }
+
+  /**
+   * Prepares the current environment for running the test.
+   *
+   * Backups various current environment variables and resets them, so they do
+   * not interfere with the Drupal site installation in which tests are executed
+   * and can be restored in TestBase::restoreEnvironment().
+   *
+   * Also sets up new resources for the testing environment, such as the public
+   * filesystem and configuration directories.
+   *
+   * This method is private as it must only be called once by TestBase::run()
+   * (multiple invocations for the same test would have unpredictable
+   * consequences) and it must not be callable or overridable by test classes.
+   *
+   * @see TestBase::beforePrepareEnvironment()
+   */
+  private function prepareEnvironment() {
+    $user = \Drupal::currentUser();
+    // Allow (base) test classes to backup global state information.
+    $this->beforePrepareEnvironment();
+
+    // Create the database prefix for this test.
+    $this->prepareDatabasePrefix();
+
+    $language_interface = \Drupal::languageManager()->getCurrentLanguage();
+
+    // When running the test runner within a test, back up the original database
+    // prefix.
+    if (DRUPAL_TEST_IN_CHILD_SITE) {
+      $this->originalPrefix = drupal_valid_test_ua();
+    }
+
+    // Backup current in-memory configuration.
+    $site_path = \Drupal::service('site.path');
+    $this->originalSite = $site_path;
+    $this->originalSettings = Settings::getAll();
+    $this->originalConfig = $GLOBALS['config'];
+    // @todo Remove all remnants of $GLOBALS['conf'].
+    // @see https://www.drupal.org/node/2183323
+    $this->originalConf = isset($GLOBALS['conf']) ? $GLOBALS['conf'] : NULL;
+
+    // Backup statics and globals.
+    $this->originalContainer = \Drupal::getContainer();
+    $this->originalLanguage = $language_interface;
+    $this->originalConfigDirectories = $GLOBALS['config_directories'];
+
+    // Save further contextual information.
+    // Use the original files directory to avoid nesting it within an existing
+    // simpletest directory if a test is executed within a test.
+    $this->originalFileDirectory = Settings::get('file_public_path', $site_path . '/files');
+    $this->originalProfile = drupal_get_profile();
+    $this->originalUser = isset($user) ? clone $user : NULL;
+
+    // Prevent that session data is leaked into the UI test runner by closing
+    // the session and then setting the session-name (i.e. the name of the
+    // session cookie) to a random value. If a test starts a new session, then
+    // it will be associated with a different session-name. After the test-run
+    // it can be safely destroyed.
+    // @see TestBase::restoreEnvironment()
+    if (PHP_SAPI !== 'cli' && session_status() === PHP_SESSION_ACTIVE) {
+      session_write_close();
+    }
+    $this->originalSessionName = session_name();
+    session_name('SIMPLETEST' . Crypt::randomBytesBase64());
+
+    // Save and clean the shutdown callbacks array because it is static cached
+    // and will be changed by the test run. Otherwise it will contain callbacks
+    // from both environments and the testing environment will try to call the
+    // handlers defined by the original one.
+    $callbacks = &drupal_register_shutdown_function();
+    $this->originalShutdownCallbacks = $callbacks;
+    $callbacks = [];
+
+    // Create test directory ahead of installation so fatal errors and debug
+    // information can be logged during installation process.
+    file_prepare_directory($this->siteDirectory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
+
+    // Prepare filesystem directory paths.
+    $this->publicFilesDirectory = $this->siteDirectory . '/files';
+    $this->privateFilesDirectory = $this->siteDirectory . '/private';
+    $this->tempFilesDirectory = $this->siteDirectory . '/temp';
+    $this->translationFilesDirectory = $this->siteDirectory . '/translations';
+
+    $this->generatedTestFiles = FALSE;
+
+    // Ensure the configImporter is refreshed for each test.
+    $this->configImporter = NULL;
+
+    // Unregister all custom stream wrappers of the parent site.
+    // Availability of Drupal stream wrappers varies by test base class:
+    // - KernelTestBase supports and maintains stream wrappers in a custom
+    //   way.
+    // - WebTestBase re-initializes Drupal stream wrappers after installation.
+    // The original stream wrappers are restored after the test run.
+    // @see TestBase::restoreEnvironment()
+    $this->originalContainer->get('stream_wrapper_manager')->unregister();
+
+    // Reset statics.
+    drupal_static_reset();
+
+    // Ensure there is no service container.
+    $this->container = NULL;
+    \Drupal::unsetContainer();
+
+    // Unset globals.
+    unset($GLOBALS['config_directories']);
+    unset($GLOBALS['config']);
+    unset($GLOBALS['conf']);
+
+    // Log fatal errors.
+    ini_set('log_errors', 1);
+    ini_set('error_log', DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log');
+
+    // Change the database prefix.
+    $this->changeDatabasePrefix();
+
+    // After preparing the environment and changing the database prefix, we are
+    // in a valid test environment.
+    drupal_valid_test_ua($this->databasePrefix);
+
+    // Reset settings.
+    new Settings([
+      // For performance, simply use the database prefix as hash salt.
+      'hash_salt' => $this->databasePrefix,
+      'container_yamls' => [],
+    ]);
+
+    drupal_set_time_limit($this->timeLimit);
+  }
+
+  /**
+   * Performs cleanup tasks after each individual test method has been run.
+   */
+  protected function tearDown() {
+  }
+
+  /**
+   * Cleans up the test environment and restores the original environment.
+   *
+   * Deletes created files, database tables, and reverts environment changes.
+   *
+   * This method needs to be invoked for both unit and integration tests.
+   *
+   * @see TestBase::prepareDatabasePrefix()
+   * @see TestBase::changeDatabasePrefix()
+   * @see TestBase::prepareEnvironment()
+   */
+  private function restoreEnvironment() {
+    // Destroy the session if one was started during the test-run.
+    $_SESSION = [];
+    if (PHP_SAPI !== 'cli' && session_status() === PHP_SESSION_ACTIVE) {
+      session_destroy();
+      $params = session_get_cookie_params();
+      setcookie(session_name(), '', REQUEST_TIME - 3600, $params['path'], $params['domain'], $params['secure'], $params['httponly']);
+    }
+    session_name($this->originalSessionName);
+
+    // Reset all static variables.
+    // Unsetting static variables will potentially invoke destruct methods,
+    // which might call into functions that prime statics and caches again.
+    // In that case, all functions are still operating on the test environment,
+    // which means they may need to access its filesystem and database.
+    drupal_static_reset();
+
+    if ($this->container && $this->container->has('state') && $state = $this->container->get('state')) {
+      $captured_emails = $state->get('system.test_mail_collector') ?: [];
+      $emailCount = count($captured_emails);
+      if ($emailCount) {
+        $message = $emailCount == 1 ? '1 email was sent during this test.' : $emailCount . ' emails were sent during this test.';
+        $this->pass($message, 'Email');
+      }
+    }
+
+    // Sleep for 50ms to allow shutdown functions and terminate events to
+    // complete. Further information: https://www.drupal.org/node/2194357.
+    usleep(50000);
+
+    // Remove all prefixed tables.
+    $original_connection_info = Database::getConnectionInfo('simpletest_original_default');
+    $original_prefix = $original_connection_info['default']['prefix']['default'];
+    $test_connection_info = Database::getConnectionInfo('default');
+    $test_prefix = $test_connection_info['default']['prefix']['default'];
+    if ($original_prefix != $test_prefix) {
+      $tables = Database::getConnection()->schema()->findTables('%');
+      foreach ($tables as $table) {
+        if (Database::getConnection()->schema()->dropTable($table)) {
+          unset($tables[$table]);
+        }
+      }
+    }
+
+    // In case a fatal error occurred that was not in the test process read the
+    // log to pick up any fatal errors.
+    simpletest_log_read($this->testId, $this->databasePrefix, get_class($this));
+
+    // Restore original dependency injection container.
+    $this->container = $this->originalContainer;
+    \Drupal::setContainer($this->originalContainer);
+
+    // Delete test site directory.
+    file_unmanaged_delete_recursive($this->siteDirectory, [$this, 'filePreDeleteCallback']);
+
+    // Restore original database connection.
+    Database::removeConnection('default');
+    Database::renameConnection('simpletest_original_default', 'default');
+
+    // Reset all static variables.
+    // All destructors of statically cached objects have been invoked above;
+    // this second reset is guaranteed to reset everything to nothing.
+    drupal_static_reset();
+
+    // Restore original in-memory configuration.
+    $GLOBALS['config'] = $this->originalConfig;
+    $GLOBALS['conf'] = $this->originalConf;
+    new Settings($this->originalSettings);
+
+    // Restore original statics and globals.
+    $GLOBALS['config_directories'] = $this->originalConfigDirectories;
+
+    // Re-initialize original stream wrappers of the parent site.
+    // This must happen after static variables have been reset and the original
+    // container and $config_directories are restored, as simpletest_log_read()
+    // uses the public stream wrapper to locate the error.log.
+    $this->originalContainer->get('stream_wrapper_manager')->register();
+
+    if (isset($this->originalPrefix)) {
+      drupal_valid_test_ua($this->originalPrefix);
+    }
+    else {
+      drupal_valid_test_ua(FALSE);
+    }
+
+    // Restore original shutdown callbacks.
+    $callbacks = &drupal_register_shutdown_function();
+    $callbacks = $this->originalShutdownCallbacks;
+  }
+
+  /**
+   * Handle errors during test runs.
+   *
+   * Because this is registered in set_error_handler(), it has to be public.
+   *
+   * @see set_error_handler
+   */
+  public function errorHandler($severity, $message, $file = NULL, $line = NULL) {
+    if ($severity & error_reporting()) {
+      $error_map = [
+        E_STRICT => 'Run-time notice',
+        E_WARNING => 'Warning',
+        E_NOTICE => 'Notice',
+        E_CORE_ERROR => 'Core error',
+        E_CORE_WARNING => 'Core warning',
+        E_USER_ERROR => 'User error',
+        E_USER_WARNING => 'User warning',
+        E_USER_NOTICE => 'User notice',
+        E_RECOVERABLE_ERROR => 'Recoverable error',
+        E_DEPRECATED => 'Deprecated',
+        E_USER_DEPRECATED => 'User deprecated',
+      ];
+
+      $backtrace = debug_backtrace();
+
+      // Add verbose backtrace for errors, but not for debug() messages.
+      if ($severity !== E_USER_NOTICE) {
+        $verbose_backtrace = $backtrace;
+        array_shift($verbose_backtrace);
+        $message .= '<pre class="backtrace">' . Error::formatBacktrace($verbose_backtrace) . '</pre>';
+      }
+
+      $this->error($message, $error_map[$severity], Error::getLastCaller($backtrace));
+    }
+    return TRUE;
+  }
+
+  /**
+   * Handle exceptions.
+   *
+   * @see set_exception_handler
+   */
+  protected function exceptionHandler($exception) {
+    $backtrace = $exception->getTrace();
+    $verbose_backtrace = $backtrace;
+    // Push on top of the backtrace the call that generated the exception.
+    array_unshift($backtrace, [
+      'line' => $exception->getLine(),
+      'file' => $exception->getFile(),
+    ]);
+    $decoded_exception = Error::decodeException($exception);
+    unset($decoded_exception['backtrace']);
+    $message = SafeMarkup::format('%type: @message in %function (line %line of %file). <pre class="backtrace">@backtrace</pre>', $decoded_exception + [
+      '@backtrace' => Error::formatBacktrace($verbose_backtrace),
+    ]);
+    $this->error($message, 'Uncaught exception', Error::getLastCaller($backtrace));
+  }
+
+  /**
+   * Changes in memory settings.
+   *
+   * @param $name
+   *   The name of the setting to return.
+   * @param $value
+   *   The value of the setting.
+   *
+   * @see \Drupal\Core\Site\Settings::get()
+   */
+  protected function settingsSet($name, $value) {
+    $settings = Settings::getAll();
+    $settings[$name] = $value;
+    new Settings($settings);
+  }
+
+  /**
+   * Ensures test files are deletable within file_unmanaged_delete_recursive().
+   *
+   * Some tests chmod generated files to be read only. During
+   * TestBase::restoreEnvironment() and other cleanup operations, these files
+   * need to get deleted too.
+   */
+  public static function filePreDeleteCallback($path) {
+    // When the webserver runs with the same system user as the test runner, we
+    // can make read-only files writable again. If not, chmod will fail while
+    // the file deletion still works if file permissions have been configured
+    // correctly. Thus, we ignore any problems while running chmod.
+    @chmod($path, 0700);
+  }
+
+  /**
+   * Configuration accessor for tests. Returns non-overridden configuration.
+   *
+   * @param $name
+   *   Configuration name.
+   *
+   * @return \Drupal\Core\Config\Config
+   *   The configuration object with original configuration data.
+   */
+  protected function config($name) {
+    return \Drupal::configFactory()->getEditable($name);
+  }
+
+  /**
+   * Gets the database prefix.
+   *
+   * @return string
+   *   The database prefix
+   */
+  public function getDatabasePrefix() {
+    return $this->databasePrefix;
+  }
+
+  /**
+   * Gets the temporary files directory.
+   *
+   * @return string
+   *   The temporary files directory.
+   */
+  public function getTempFilesDirectory() {
+    return $this->tempFilesDirectory;
+  }
+
+}