diff -u b/drupalci.yml b/drupalci.yml
--- b/drupalci.yml
+++ b/drupalci.yml
@@ -13,6 +13,7 @@
         commands:
           - cd ${SOURCE_DIR} && sudo -u www-data curl https://www.drupal.org/files/issues/2019-10-07/3085728.patch | git apply -
           - cd ${SOURCE_DIR} && sudo -u www-data curl https://www.drupal.org/files/issues/2019-10-16/3088400-8_0.patch | git apply -
+          - cd ${SOURCE_DIR} && sudo -u www-data curl https://www.drupal.org/files/issues/2019-10-16/3088447.patch | git apply -
       # run_tests task is executed several times in order of performance speeds.
       # halt-on-fail can be set on the run_tests tasks in order to fail fast.
       # suppress-deprecations is false in order to be alerted to usages of
diff -u b/tests/src/Build/InPlaceUpdateTest.php b/tests/src/Build/InPlaceUpdateTest.php
--- b/tests/src/Build/InPlaceUpdateTest.php
+++ b/tests/src/Build/InPlaceUpdateTest.php
@@ -6,6 +6,7 @@
 use Drupal\Component\FileSystem\FileSystem as DrupalFilesystem;
 use Drupal\Component\Utility\Html;
 use Drupal\Tests\automatic_updates\Build\QuickStart\QuickStartTestBase;
+use Drupal\Tests\automatic_updates\Traits\InstallTestTrait;
 use GuzzleHttp\Client;
 use Symfony\Component\Filesystem\Filesystem as SymfonyFilesystem;
 use Symfony\Component\Finder\Finder;
@@ -22,6 +23,7 @@
  * @requires externalCommand tar
  */
 class InPlaceUpdateTest extends QuickStartTestBase {
+  use InstallTestTrait;
 
   /**
    * The files which are candidates for deletion during an upgrade.
@@ -66,14 +68,15 @@
     $this->installQuickStart('minimal');
 
     // Currently, this test has to use extension_discovery_scan_tests so we can
-    // enable test modules.
+    // install test modules.
     $fs->chmod($this->getWorkspaceDirectory() . '/sites/default/settings.php', 0640, 0000);
     file_put_contents($this->getWorkspaceDirectory() . '/sites/default/settings.php', '$settings[\'extension_discovery_scan_tests\'] = TRUE;' . PHP_EOL, FILE_APPEND);
 
     // Log in so that we can install modules.
     $this->formLogin($this->adminUsername, $this->adminPassword);
-    $this->moduleEnable('automatic_updates');
-    $this->moduleEnable('test_automatic_updates');
+    $this->moduleInstall('update');
+    $this->moduleInstall('automatic_updates');
+    $this->moduleInstall('test_automatic_updates');
 
     // Confirm we are running correct Drupal version.
     $finder = new Finder();
@@ -138,15 +141,16 @@
     }
 
     // Currently, this test has to use extension_discovery_scan_tests so we can
-    // enable test modules.
+    // install test modules.
     $fs->chmod($this->getWorkspaceDirectory() . '/sites/default/settings.php', 0640, 0000);
     file_put_contents($this->getWorkspaceDirectory() . '/sites/default/settings.php', '$settings[\'extension_discovery_scan_tests\'] = TRUE;' . PHP_EOL, FILE_APPEND);
 
     // Log in so that we can install projects.
     $this->formLogin($this->adminUsername, $this->adminPassword);
-    $this->moduleEnable('automatic_updates');
-    $this->moduleEnable('test_automatic_updates');
-    $this->{"{$project_type}Enable"}($project);
+    $this->moduleInstall('update');
+    $this->moduleInstall('automatic_updates');
+    $this->moduleInstall('test_automatic_updates');
+    $this->{"{$project_type}Install"}($project);
 
     // Assert that the site is functional before updating.
     $this->visit();
@@ -258,31 +262,2 @@
 
-  /**
-   * Helper method that uses Drupal's module page to enable a module.
-   */
-  protected function moduleEnable($module_name) {
-    $assert = $this->visit('/admin/modules')
-      ->assertSession();
-    $field = Html::getClass("edit-modules $module_name enable");
-    // No need to enable a module if it is already enabled.
-    if ($this->getMink()->getSession()->getPage()->findField($field)->isChecked()) {
-      return;
-    }
-    $assert->fieldExists($field)->check();
-    $session = $this->getMink()->getSession();
-    $session->getPage()->findButton('Install')->submit();
-    $assert->fieldExists($field)->isChecked();
-    $assert->statusCodeEquals(200);
-  }
-
-  /**
-   * Helper method that uses Drupal's theme page to enable a theme.
-   */
-  protected function themeEnable($theme_name) {
-    $this->moduleEnable('test_automatic_updates');
-    $assert = $this->visit("/admin/appearance/default?theme=$theme_name")
-      ->assertSession();
-    $assert->pageTextNotContains('theme was not found');
-    $assert->statusCodeEquals(200);
-  }
-
 }
diff -u b/tests/src/Build/ModifiedFilesTest.php b/tests/src/Build/ModifiedFilesTest.php
--- b/tests/src/Build/ModifiedFilesTest.php
+++ b/tests/src/Build/ModifiedFilesTest.php
@@ -4,6 +4,7 @@
 
 use Drupal\Component\Utility\Html;
 use Drupal\Tests\automatic_updates\Build\QuickStart\QuickStartTestBase;
+use Drupal\Tests\automatic_updates\Traits\InstallTestTrait;
 use Symfony\Component\Filesystem\Filesystem as SymfonyFilesystem;
 
 /**
@@ -17,6 +18,7 @@
  * @requires externalCommand tar
  */
 class ModifiedFilesTest extends QuickStartTestBase {
+  use InstallTestTrait;
 
   /**
    * Symfony file system.
@@ -122,7 +124,7 @@
     $this->installQuickStart('minimal');
 
     // Currently, this test has to use extension_discovery_scan_tests so we can
-    // enable test modules.
+    // install test modules.
     $this->symfonyFileSystem->chmod($this->getWorkspaceDirectory() . '/sites/default', 0750, 0000);
     $this->symfonyFileSystem->chmod($this->getWorkspaceDirectory() . '/sites/default/settings.php', 0640, 0000);
     $settings_php = $this->getWorkspaceDirectory() . '/sites/default/settings.php';
@@ -136,9 +138,9 @@
 
     // Log in so that we can install modules.
     $this->formLogin($this->adminUsername, $this->adminPassword);
-    $this->moduleEnable('update');
-    $this->moduleEnable('automatic_updates');
-    $this->moduleEnable('test_automatic_updates');
+    $this->moduleInstall('update');
+    $this->moduleInstall('automatic_updates');
+    $this->moduleInstall('test_automatic_updates');
 
     // Assert that the site is functional.
     $this->visit();
@@ -166,19 +168,2 @@
 
-  /**
-   * Helper method that uses Drupal's module page to enable a module.
-   */
-  protected function moduleEnable($module_name) {
-    $this->visit('/admin/modules');
-    $field = Html::getClass("edit-modules $module_name enable");
-    // No need to enable a module if it is already enabled.
-    if ($this->getMink()->getSession()->getPage()->findField($field)->isChecked()) {
-      return;
-    }
-    $assert = $this->getMink()->assertSession();
-    $assert->fieldExists($field)->check();
-    $session = $this->getMink()->getSession();
-    $session->getPage()->findButton('Install')->submit();
-    $assert->fieldExists($field)->isChecked();
-  }
-
 }
only in patch2:
unchanged:
--- /dev/null
+++ b/tests/src/Traits/InstallTestTrait.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Drupal\Tests\automatic_updates\Traits;
+
+use Drupal\Component\Utility\Html;
+
+/**
+ * Provides common functionality for automatic update test classes.
+ */
+trait InstallTestTrait {
+
+  /**
+   * Helper method that uses Drupal's module page to install a module.
+   */
+  protected function moduleInstall($module_name) {
+    $assert = $this->visit('/admin/modules')
+      ->assertSession();
+    $field = Html::getClass("edit-modules $module_name enable");
+    // No need to install a module if it is already install.
+    if ($this->getMink()->getSession()->getPage()->findField($field)->isChecked()) {
+      return;
+    }
+    $assert->fieldExists($field)->check();
+    $session = $this->getMink()->getSession();
+    $session->getPage()->findButton('Install')->submit();
+    $assert->fieldExists($field)->isChecked();
+    $assert->statusCodeEquals(200);
+  }
+
+  /**
+   * Helper method that uses Drupal's theme page to install a theme.
+   */
+  protected function themeInstall($theme_name) {
+    $this->moduleInstall('test_automatic_updates');
+    $assert = $this->visit("/admin/appearance/default?theme=$theme_name")
+      ->assertSession();
+    $assert->pageTextNotContains('theme was not found');
+    $assert->statusCodeEquals(200);
+  }
+
+}