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diff --git a/web/core/tests/Drupal/Tests/UiHelperTrait.php b/web/core/tests/Drupal/Tests/UiHelperTrait.php
new file mode 100644
index 000000000..d0817f607
--- /dev/null
+++ b/web/core/tests/Drupal/Tests/UiHelperTrait.php
@@ -0,0 +1,566 @@
+<?php
+
+namespace Drupal\Tests;
+
+use Behat\Mink\Driver\GoutteDriver;
+use Drupal\Component\Render\FormattableMarkup;
+use Drupal\Component\Utility\Html;
+use Drupal\Component\Utility\UrlHelper;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Session\AnonymousUserSession;
+use Drupal\Core\Test\RefreshVariablesTrait;
+use Drupal\Core\Url;
+
+/**
+ * Provides UI helper methods.
+ */
+trait UiHelperTrait {
+
+  use BrowserHtmlDebugTrait;
+  use AssertHelperTrait;
+  use RefreshVariablesTrait;
+
+  /**
+   * The current user logged in using the Mink controlled browser.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $loggedInUser = FALSE;
+
+  /**
+   * The number of meta refresh redirects to follow, or NULL if unlimited.
+   *
+   * @var null|int
+   */
+  protected $maximumMetaRefreshCount = NULL;
+
+  /**
+   * The number of meta refresh redirects followed during ::drupalGet().
+   *
+   * @var int
+   */
+  protected $metaRefreshCount = 0;
+
+  /**
+   * Fills and submits a form.
+   *
+   * @param array $edit
+   *   Field data in an associative array. Changes the current input fields
+   *   (where possible) to the values indicated.
+   *
+   *   A checkbox can be set to TRUE to be checked and should be set to FALSE to
+   *   be unchecked.
+   * @param string $submit
+   *   Value of the submit button whose click is to be emulated. For example,
+   *   'Save'. The processing of the request depends on this value. For example,
+   *   a form may have one button with the value 'Save' and another button with
+   *   the value 'Delete', and execute different code depending on which one is
+   *   clicked.
+   * @param string $form_html_id
+   *   (optional) HTML ID of the form to be submitted. On some pages
+   *   there are many identical forms, so just using the value of the submit
+   *   button is not enough. For example: 'trigger-node-presave-assign-form'.
+   *   Note that this is not the Drupal $form_id, but rather the HTML ID of the
+   *   form, which is typically the same thing but with hyphens replacing the
+   *   underscores.
+   */
+  protected function submitForm(array $edit, $submit, $form_html_id = NULL) {
+    $assert_session = $this->assertSession();
+
+    // Get the form.
+    if (isset($form_html_id)) {
+      $form = $assert_session->elementExists('xpath', "//form[@id='$form_html_id']");
+      $submit_button = $assert_session->buttonExists($submit, $form);
+      $action = $form->getAttribute('action');
+    }
+    else {
+      $submit_button = $assert_session->buttonExists($submit);
+      $form = $assert_session->elementExists('xpath', './ancestor::form', $submit_button);
+      $action = $form->getAttribute('action');
+    }
+
+    // Edit the form values.
+    foreach ($edit as $name => $value) {
+      $field = $assert_session->fieldExists($name, $form);
+
+      // Provide support for the values '1' and '0' for checkboxes instead of
+      // TRUE and FALSE.
+      // @todo Get rid of supporting 1/0 by converting all tests cases using
+      // this to boolean values.
+      $field_type = $field->getAttribute('type');
+      if ($field_type === 'checkbox') {
+        $value = (bool) $value;
+      }
+
+      $field->setValue($value);
+    }
+
+    // Submit form.
+    $this->prepareRequest();
+    $submit_button->press();
+
+    // Ensure that any changes to variables in the other thread are picked up.
+    $this->refreshVariables();
+
+    // Check if there are any meta refresh redirects (like Batch API pages).
+    if ($this->checkForMetaRefresh()) {
+      // We are finished with all meta refresh redirects, so reset the counter.
+      $this->metaRefreshCount = 0;
+    }
+
+    // Log only for JavascriptTestBase tests because for Goutte we log with
+    // ::getResponseLogHandler.
+    if ($this->htmlOutputEnabled && !($this->getSession()->getDriver() instanceof GoutteDriver)) {
+      $out = $this->getSession()->getPage()->getContent();
+      $html_output = 'POST request to: ' . $action .
+        '<hr />Ending URL: ' . $this->getSession()->getCurrentUrl();
+      $html_output .= '<hr />' . $out;
+      $html_output .= $this->getHtmlOutputHeaders();
+      $this->htmlOutput($html_output);
+    }
+
+  }
+
+  /**
+   * Executes a form submission.
+   *
+   * It will be done as usual submit form with Mink.
+   *
+   * @param \Drupal\Core\Url|string $path
+   *   Location of the post form. Either a Drupal path or an absolute path or
+   *   NULL to post to the current page. For multi-stage forms you can set the
+   *   path to NULL and have it post to the last received page. Example:
+   *
+   *   @code
+   *   // First step in form.
+   *   $edit = array(...);
+   *   $this->drupalPostForm('some_url', $edit, 'Save');
+   *
+   *   // Second step in form.
+   *   $edit = array(...);
+   *   $this->drupalPostForm(NULL, $edit, 'Save');
+   *   @endcode
+   * @param array $edit
+   *   Field data in an associative array. Changes the current input fields
+   *   (where possible) to the values indicated.
+   *
+   *   When working with form tests, the keys for an $edit element should match
+   *   the 'name' parameter of the HTML of the form. For example, the 'body'
+   *   field for a node has the following HTML:
+   *   @code
+   *   <textarea id="edit-body-und-0-value" class="text-full form-textarea
+   *    resize-vertical" placeholder="" cols="60" rows="9"
+   *    name="body[0][value]"></textarea>
+   *   @endcode
+   *   When testing this field using an $edit parameter, the code becomes:
+   *   @code
+   *   $edit["body[0][value]"] = 'My test value';
+   *   @endcode
+   *
+   *   A checkbox can be set to TRUE to be checked and should be set to FALSE to
+   *   be unchecked. Multiple select fields can be tested using 'name[]' and
+   *   setting each of the desired values in an array:
+   *   @code
+   *   $edit = array();
+   *   $edit['name[]'] = array('value1', 'value2');
+   *   @endcode
+   *   @todo change $edit to disallow NULL as a value for Drupal 9.
+   *     https://www.drupal.org/node/2802401
+   * @param string $submit
+   *   Value of the submit button whose click is to be emulated. For example,
+   *   'Save'. The processing of the request depends on this value. For example,
+   *   a form may have one button with the value 'Save' and another button with
+   *   the value 'Delete', and execute different code depending on which one is
+   *   clicked.
+   *
+   *   This function can also be called to emulate an Ajax submission. In this
+   *   case, this value needs to be an array with the following keys:
+   *   - path: A path to submit the form values to for Ajax-specific processing.
+   *   - triggering_element: If the value for the 'path' key is a generic Ajax
+   *     processing path, this needs to be set to the name of the element. If
+   *     the name doesn't identify the element uniquely, then this should
+   *     instead be an array with a single key/value pair, corresponding to the
+   *     element name and value. The \Drupal\Core\Form\FormAjaxResponseBuilder
+   *     uses this to find the #ajax information for the element, including
+   *     which specific callback to use for processing the request.
+   *
+   *   This can also be set to NULL in order to emulate an Internet Explorer
+   *   submission of a form with a single text field, and pressing ENTER in that
+   *   textfield: under these conditions, no button information is added to the
+   *   POST data.
+   * @param array $options
+   *   Options to be forwarded to the url generator.
+   * @param string|null $form_html_id
+   *   (optional) HTML ID of the form to be submitted. On some pages
+   *   there are many identical forms, so just using the value of the submit
+   *   button is not enough. For example: 'trigger-node-presave-assign-form'.
+   *   Note that this is not the Drupal $form_id, but rather the HTML ID of the
+   *   form, which is typically the same thing but with hyphens replacing the
+   *   underscores.
+   *
+   * @return string
+   *   (deprecated) The response content after submit form. It is necessary for
+   *   backwards compatibility and will be removed before Drupal 9.0. You should
+   *   just use the webAssert object for your assertions.
+   */
+  protected function drupalPostForm($path, $edit, $submit, array $options = [], $form_html_id = NULL) {
+    if (is_object($submit)) {
+      // Cast MarkupInterface objects to string.
+      $submit = (string) $submit;
+    }
+    if ($edit === NULL) {
+      $edit = [];
+    }
+    if (is_array($edit)) {
+      $edit = $this->castSafeStrings($edit);
+    }
+
+    if (isset($path)) {
+      $this->drupalGet($path, $options);
+    }
+
+    $this->submitForm($edit, $submit, $form_html_id);
+
+    return $this->getSession()->getPage()->getContent();
+  }
+
+  /**
+   * Logs in a user using the Mink controlled browser.
+   *
+   * If a user is already logged in, then the current user is logged out before
+   * logging in the specified user.
+   *
+   * Please note that neither the current user nor the passed-in user object is
+   * populated with data of the logged in user. If you need full access to the
+   * user object after logging in, it must be updated manually. If you also need
+   * access to the plain-text password of the user (set by drupalCreateUser()),
+   * e.g. to log in the same user again, then it must be re-assigned manually.
+   * For example:
+   * @code
+   *   // Create a user.
+   *   $account = $this->drupalCreateUser(array());
+   *   $this->drupalLogin($account);
+   *   // Load real user object.
+   *   $pass_raw = $account->passRaw;
+   *   $account = User::load($account->id());
+   *   $account->passRaw = $pass_raw;
+   * @endcode
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   User object representing the user to log in.
+   *
+   * @see drupalCreateUser()
+   */
+  protected function drupalLogin(AccountInterface $account) {
+    if ($this->loggedInUser) {
+      $this->drupalLogout();
+    }
+
+    $this->drupalGet('user/login');
+    $this->submitForm([
+      'name' => $account->getUsername(),
+      'pass' => $account->passRaw,
+    ], t('Log in'));
+
+    // @see ::drupalUserIsLoggedIn()
+    $account->sessionId = $this->getSession()->getCookie(\Drupal::service('session_configuration')->getOptions(\Drupal::request())['name']);
+    $this->assertTrue($this->drupalUserIsLoggedIn($account), new FormattableMarkup('User %name successfully logged in.', ['%name' => $account->getAccountName()]));
+
+    $this->loggedInUser = $account;
+    $this->container->get('current_user')->setAccount($account);
+  }
+
+  /**
+   * Logs a user out of the Mink controlled browser and confirms.
+   *
+   * Confirms logout by checking the login page.
+   */
+  protected function drupalLogout() {
+    // Make a request to the logout page, and redirect to the user page, the
+    // idea being if you were properly logged out you should be seeing a login
+    // screen.
+    $assert_session = $this->assertSession();
+    $this->drupalGet('user/logout', ['query' => ['destination' => 'user']]);
+    $assert_session->fieldExists('name');
+    $assert_session->fieldExists('pass');
+
+    // @see BrowserTestBase::drupalUserIsLoggedIn()
+    unset($this->loggedInUser->sessionId);
+    $this->loggedInUser = FALSE;
+    \Drupal::currentUser()->setAccount(new AnonymousUserSession());
+  }
+
+  /**
+   * Returns WebAssert object.
+   *
+   * @param string $name
+   *   (optional) Name of the session. Defaults to the active session.
+   *
+   * @return \Drupal\Tests\WebAssert
+   *   A new web-assert option for asserting the presence of elements with.
+   */
+  public function assertSession($name = NULL) {
+    $this->addToAssertionCount(1);
+    return new WebAssert($this->getSession($name), $this->baseUrl);
+  }
+
+  /**
+   * Retrieves a Drupal path or an absolute path.
+   *
+   * @param string|\Drupal\Core\Url $path
+   *   Drupal path or URL to load into Mink controlled browser.
+   * @param array $options
+   *   (optional) Options to be forwarded to the url generator.
+   * @param string[] $headers
+   *   An array containing additional HTTP request headers, the array keys are
+   *   the header names and the array values the header values. This is useful
+   *   to set for example the "Accept-Language" header for requesting the page
+   *   in a different language. Note that not all headers are supported, for
+   *   example the "Accept" header is always overridden by the browser. For
+   *   testing REST APIs it is recommended to obtain a separate HTTP client
+   *   using getHttpClient() and performing requests that way.
+   *
+   * @return string
+   *   The retrieved HTML string, also available as $this->getRawContent()
+   *
+   * @see \Drupal\Tests\BrowserTestBase::getHttpClient()
+   */
+  protected function drupalGet($path, array $options = [], array $headers = []) {
+    $options['absolute'] = TRUE;
+    $url = $this->buildUrl($path, $options);
+
+    $session = $this->getSession();
+
+    $this->prepareRequest();
+    foreach ($headers as $header_name => $header_value) {
+      $session->setRequestHeader($header_name, $header_value);
+    }
+
+    $session->visit($url);
+    $out = $session->getPage()->getContent();
+
+    // Ensure that any changes to variables in the other thread are picked up.
+    $this->refreshVariables();
+
+    // Replace original page output with new output from redirected page(s).
+    if ($new = $this->checkForMetaRefresh()) {
+      $out = $new;
+      // We are finished with all meta refresh redirects, so reset the counter.
+      $this->metaRefreshCount = 0;
+    }
+
+    // Log only for JavascriptTestBase tests because for Goutte we log with
+    // ::getResponseLogHandler.
+    if ($this->htmlOutputEnabled && !($this->getSession()->getDriver() instanceof GoutteDriver)) {
+      $html_output = 'GET request to: ' . $url .
+        '<hr />Ending URL: ' . $this->getSession()->getCurrentUrl();
+      $html_output .= '<hr />' . $out;
+      $html_output .= $this->getHtmlOutputHeaders();
+      $this->htmlOutput($html_output);
+    }
+
+    return $out;
+  }
+
+  /**
+   * Builds an a absolute URL from a system path or a URL object.
+   *
+   * @param string|\Drupal\Core\Url $path
+   *   A system path or a URL.
+   * @param array $options
+   *   Options to be passed to Url::fromUri().
+   *
+   * @return string
+   *   An absolute URL string.
+   */
+  protected function buildUrl($path, array $options = []) {
+    if ($path instanceof Url) {
+      $url_options = $path->getOptions();
+      $options = $url_options + $options;
+      $path->setOptions($options);
+      return $path->setAbsolute()->toString();
+    }
+    // The URL generator service is not necessarily available yet; e.g., in
+    // interactive installer tests.
+    elseif (\Drupal::hasService('url_generator')) {
+      $force_internal = isset($options['external']) && $options['external'] == FALSE;
+      if (!$force_internal && UrlHelper::isExternal($path)) {
+        return Url::fromUri($path, $options)->toString();
+      }
+      else {
+        $uri = $path === '<front>' ? 'base:/' : 'base:/' . $path;
+        // Path processing is needed for language prefixing.  Skip it when a
+        // path that may look like an external URL is being used as internal.
+        $options['path_processing'] = !$force_internal;
+        return Url::fromUri($uri, $options)
+          ->setAbsolute()
+          ->toString();
+      }
+    }
+    else {
+      return $this->getAbsoluteUrl($path);
+    }
+  }
+
+  /**
+   * Takes a path and returns an absolute path.
+   *
+   * @param string $path
+   *   A path from the Mink controlled browser content.
+   *
+   * @return string
+   *   The $path with $base_url prepended, if necessary.
+   */
+  protected function getAbsoluteUrl($path) {
+    global $base_url, $base_path;
+
+    $parts = parse_url($path);
+    if (empty($parts['host'])) {
+      // Ensure that we have a string (and no xpath object).
+      $path = (string) $path;
+      // Strip $base_path, if existent.
+      $length = strlen($base_path);
+      if (substr($path, 0, $length) === $base_path) {
+        $path = substr($path, $length);
+      }
+      // Ensure that we have an absolute path.
+      if (empty($path) || $path[0] !== '/') {
+        $path = '/' . $path;
+      }
+      // Finally, prepend the $base_url.
+      $path = $base_url . $path;
+    }
+    return $path;
+  }
+
+  /**
+   * Prepare for a request to testing site.
+   *
+   * The testing site is protected via a SIMPLETEST_USER_AGENT cookie that is
+   * checked by drupal_valid_test_ua().
+   *
+   * @see drupal_valid_test_ua()
+   */
+  protected function prepareRequest() {
+    $session = $this->getSession();
+    $session->setCookie('SIMPLETEST_USER_AGENT', drupal_generate_test_ua($this->databasePrefix));
+  }
+
+  /**
+   * Returns whether a given user account is logged in.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The user account object to check.
+   *
+   * @return bool
+   *   Return TRUE if the user is logged in, FALSE otherwise.
+   */
+  protected function drupalUserIsLoggedIn(AccountInterface $account) {
+    $logged_in = FALSE;
+
+    if (isset($account->sessionId)) {
+      $session_handler = \Drupal::service('session_handler.storage');
+      $logged_in = (bool) $session_handler->read($account->sessionId);
+    }
+
+    return $logged_in;
+  }
+
+  /**
+   * Clicks the element with the given CSS selector.
+   *
+   * @param string $css_selector
+   *   The CSS selector identifying the element to click.
+   */
+  protected function click($css_selector) {
+    $starting_url = $this->getSession()->getCurrentUrl();
+    $this->getSession()->getDriver()->click($this->cssSelectToXpath($css_selector));
+    // Log only for JavascriptTestBase tests because for Goutte we log with
+    // ::getResponseLogHandler.
+    if ($this->htmlOutputEnabled && !($this->getSession()->getDriver() instanceof GoutteDriver)) {
+      $out = $this->getSession()->getPage()->getContent();
+      $html_output =
+        'Clicked element with CSS selector: ' . $css_selector .
+        '<hr />Starting URL: ' . $starting_url .
+        '<hr />Ending URL: ' . $this->getSession()->getCurrentUrl();
+      $html_output .= '<hr />' . $out;
+      $html_output .= $this->getHtmlOutputHeaders();
+      $this->htmlOutput($html_output);
+    }
+  }
+
+  /**
+   * Follows a link by complete name.
+   *
+   * Will click the first link found with this link text.
+   *
+   * If the link is discovered and clicked, the test passes. Fail otherwise.
+   *
+   * @param string|\Drupal\Component\Render\MarkupInterface $label
+   *   Text between the anchor tags.
+   * @param int $index
+   *   (optional) The index number for cases where multiple links have the same
+   *   text. Defaults to 0.
+   */
+  protected function clickLink($label, $index = 0) {
+    $label = (string) $label;
+    $links = $this->getSession()->getPage()->findAll('named', ['link', $label]);
+    $this->assertArrayHasKey($index, $links, 'The link ' . $label . ' was not found on the page.');
+    $links[$index]->click();
+  }
+
+  /**
+   * Retrieves the plain-text content from the current page.
+   */
+  protected function getTextContent() {
+    return $this->getSession()->getPage()->getText();
+  }
+
+  /**
+   * Get the current URL from the browser.
+   *
+   * @return string
+   *   The current URL.
+   */
+  protected function getUrl() {
+    return $this->getSession()->getCurrentUrl();
+  }
+
+  /**
+   * Checks for meta refresh tag and if found call drupalGet() recursively.
+   *
+   * This function looks for the http-equiv attribute to be set to "Refresh" and
+   * is case-insensitive.
+   *
+   * @return string|false
+   *   Either the new page content or FALSE.
+   */
+  protected function checkForMetaRefresh() {
+    $refresh = $this->cssSelect('meta[http-equiv="Refresh"], meta[http-equiv="refresh"]');
+    if (!empty($refresh) && (!isset($this->maximumMetaRefreshCount) || $this->metaRefreshCount < $this->maximumMetaRefreshCount)) {
+      // Parse the content attribute of the meta tag for the format:
+      // "[delay]: URL=[page_to_redirect_to]".
+      if (preg_match('/\d+;\s*URL=(?<url>.*)/i', $refresh[0]->getAttribute('content'), $match)) {
+        $this->metaRefreshCount++;
+        return $this->drupalGet($this->getAbsoluteUrl(Html::decodeEntities($match['url'])));
+      }
+    }
+    return FALSE;
+  }
+
+  /**
+   * Searches elements using a CSS selector in the raw content.
+   *
+   * The search is relative to the root element (HTML tag normally) of the page.
+   *
+   * @param string $selector
+   *   CSS selector to use in the search.
+   *
+   * @return \Behat\Mink\Element\NodeElement[]
+   *   The list of elements on the page that match the selector.
+   */
+  protected function cssSelect($selector) {
+    return $this->getSession()->getPage()->findAll('css', $selector);
+  }
+
+}