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diff --git a/web/core/modules/settings_tray/tests/src/FunctionalJavascript/SettingsTrayJavascriptTestBase.php b/web/core/modules/settings_tray/tests/src/FunctionalJavascript/SettingsTrayJavascriptTestBase.php
new file mode 100644
index 000000000..6dd026c5c
--- /dev/null
+++ b/web/core/modules/settings_tray/tests/src/FunctionalJavascript/SettingsTrayJavascriptTestBase.php
@@ -0,0 +1,126 @@
+<?php
+
+namespace Drupal\Tests\settings_tray\FunctionalJavascript;
+
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
+
+/**
+ * Base class contains common test functionality for the Settings Tray module.
+ */
+abstract class SettingsTrayJavascriptTestBase extends JavascriptTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function drupalGet($path, array $options = [], array $headers = []) {
+    $return = parent::drupalGet($path, $options, $headers);
+    $this->assertPageLoadComplete();
+    return $return;
+  }
+
+  /**
+   * Assert the page is completely loaded.
+   *
+   * Ajax requests may happen after page loads. Also for users who have access
+   * to contextual links the contextual link placeholders will be filled after
+   * the page is received.
+   */
+  protected function assertPageLoadComplete() {
+    $this->assertSession()->assertWaitOnAjaxRequest();
+    if ($this->loggedInUser && $this->loggedInUser->hasPermission('access contextual links')) {
+      $this->assertAllContextualLinksLoaded();
+    }
+  }
+
+  /**
+   * Assert all contextual link areas have be loaded.
+   *
+   * Contextual link placeholders will be filled after
+   * the page is received.
+   *
+   * @todo Move this function to https://www.drupal.org/node/2821724.
+   */
+  protected function assertAllContextualLinksLoaded() {
+    $this->waitForNoElement('[data-contextual-id]:empty');
+  }
+
+  /**
+   * Enables a theme.
+   *
+   * @param string $theme
+   *   The theme.
+   */
+  protected function enableTheme($theme) {
+    // Enable the theme.
+    \Drupal::service('theme_installer')->install([$theme]);
+    $theme_config = \Drupal::configFactory()->getEditable('system.theme');
+    $theme_config->set('default', $theme);
+    $theme_config->save();
+  }
+
+  /**
+   * Waits for off-canvas dialog to open.
+   */
+  protected function waitForOffCanvasToOpen() {
+    $web_assert = $this->assertSession();
+    $web_assert->assertWaitOnAjaxRequest();
+    $this->assertElementVisibleAfterWait('css', '#drupal-off-canvas');
+  }
+
+  /**
+   * Waits for off-canvas dialog to close.
+   */
+  protected function waitForOffCanvasToClose() {
+    $this->waitForNoElement('#drupal-off-canvas');
+  }
+
+  /**
+   * Gets the off-canvas dialog element.
+   *
+   * @return \Behat\Mink\Element\NodeElement|null
+   */
+  protected function getTray() {
+    $tray = $this->getSession()->getPage()->find('css', '.ui-dialog[aria-describedby="drupal-off-canvas"]');
+    $this->assertEquals(FALSE, empty($tray), 'The tray was found.');
+    return $tray;
+  }
+
+  /**
+   * Waits for an element to be removed from the page.
+   *
+   * @param string $selector
+   *   CSS selector.
+   * @param int $timeout
+   *   (optional) Timeout in milliseconds, defaults to 10000.
+   */
+  protected function waitForNoElement($selector, $timeout = 10000) {
+    $condition = "(typeof jQuery !== 'undefined' && jQuery('$selector').length === 0)";
+    $this->assertJsCondition($condition, $timeout);
+  }
+
+  /**
+   * Get themes to test.
+   *
+   * @return string[]
+   *   Theme names to test.
+   */
+  protected function getTestThemes() {
+    return ['bartik', 'stark', 'classy', 'stable'];
+  }
+
+  /**
+   * Asserts the specified selector is visible after a wait.
+   *
+   * @param string $selector
+   *   The selector engine name. See ElementInterface::findAll() for the
+   *   supported selectors.
+   * @param string|array $locator
+   *   The selector locator.
+   * @param int $timeout
+   *   (Optional) Timeout in milliseconds, defaults to 10000.
+   */
+  protected function assertElementVisibleAfterWait($selector, $locator, $timeout = 10000) {
+    $this->assertNotEmpty($this->assertSession()->waitForElementVisible($selector, $locator, $timeout));
+  }
+
+}