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diff --git a/web/core/modules/update/tests/src/Functional/UpdateTestBase.php b/web/core/modules/update/tests/src/Functional/UpdateTestBase.php
new file mode 100644
index 000000000..a4d07d0b6
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+++ b/web/core/modules/update/tests/src/Functional/UpdateTestBase.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace Drupal\Tests\update\Functional;
+
+use Drupal\Core\DrupalKernel;
+use Drupal\Core\Url;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Defines some shared functions used by all update tests.
+ *
+ * The overarching methodology of these tests is we need to compare a given
+ * state of installed modules and themes (e.g., version, project grouping,
+ * timestamps, etc) against a current state of what the release history XML
+ * files we fetch say is available. We have dummy XML files (in the
+ * core/modules/update/tests directory) that describe various scenarios of
+ * what's available for different test projects, and we have dummy .info file
+ * data (specified via hook_system_info_alter() in the update_test helper
+ * module) describing what's currently installed. Each test case defines a set
+ * of projects to install, their current state (via the
+ * 'update_test_system_info' variable) and the desired available update data
+ * (via the 'update_test_xml_map' variable), and then performs a series of
+ * assertions that the report matches our expectations given the specific
+ * initial state and availability scenario.
+ */
+abstract class UpdateTestBase extends BrowserTestBase {
+
+  protected function setUp() {
+    parent::setUp();
+
+    // Change the root path which Update Manager uses to install and update
+    // projects to be inside the testing site directory. See
+    // \Drupal\update\UpdateRootFactory::get() for equivalent changes to the
+    // test child site.
+    $request = \Drupal::request();
+    $update_root = $this->container->get('update.root') . '/' . DrupalKernel::findSitePath($request);
+    $this->container->set('update.root', $update_root);
+    \Drupal::setContainer($this->container);
+
+    // Create the directories within the root path within which the Update
+    // Manager will install projects.
+    foreach (drupal_get_updaters() as $updater_info) {
+      $updater = $updater_info['class'];
+      $install_directory = $update_root . '/' . $updater::getRootDirectoryRelativePath();
+      if (!is_dir($install_directory)) {
+        mkdir($install_directory);
+      }
+    }
+  }
+
+  /**
+   * Refreshes the update status based on the desired available update scenario.
+   *
+   * @param $xml_map
+   *   Array that maps project names to availability scenarios to fetch. The key
+   *   '#all' is used if a project-specific mapping is not defined.
+   * @param $url
+   *   (optional) A string containing the URL to fetch update data from.
+   *   Defaults to 'update-test'.
+   *
+   * @see \Drupal\update_test\Controller\UpdateTestController::updateTest()
+   */
+  protected function refreshUpdateStatus($xml_map, $url = 'update-test') {
+    // Tell the Update Manager module to fetch from the URL provided by
+    // update_test module.
+    $this->config('update.settings')->set('fetch.url', Url::fromUri('base:' . $url, ['absolute' => TRUE])->toString())->save();
+    // Save the map for UpdateTestController::updateTest() to use.
+    $this->config('update_test.settings')->set('xml_map', $xml_map)->save();
+    // Manually check the update status.
+    $this->drupalGet('admin/reports/updates');
+    $this->clickLink(t('Check manually'));
+    $this->checkForMetaRefresh();
+  }
+
+  /**
+   * Runs a series of assertions that are applicable to all update statuses.
+   */
+  protected function standardTests() {
+    $this->assertRaw('<h3>' . t('Drupal core') . '</h3>');
+    $this->assertRaw(\Drupal::l(t('Drupal'), Url::fromUri('http://example.com/project/drupal')), 'Link to the Drupal project appears.');
+    $this->assertNoText(t('No available releases found'));
+  }
+
+}