diff --git a/core/modules/update/src/Tests/UpdateViaAuthorizeTest.php b/core/modules/update/src/Tests/UpdateViaAuthorizeTest.php
index 7f7fe6e..cffb786 100644
--- a/core/modules/update/src/Tests/UpdateViaAuthorizeTest.php
+++ b/core/modules/update/src/Tests/UpdateViaAuthorizeTest.php
@@ -20,6 +20,11 @@ protected function setUp() {
     parent::setUp();
     $admin_user = $this->drupalCreateUser(array('administer modules', 'administer software updates', 'administer site configuration'));
     $this->drupalLogin($admin_user);
+
+    // Create a local cache so the module is not downloaded from drupal.org.
+    $cache_directory = _update_manager_cache_directory(TRUE);
+    $validArchiveFile = __DIR__ . '/../../tests/update_test_new_module/8.x-1.0/update_test_new_module.tar.gz';
+    copy($validArchiveFile, $cache_directory . '/update_test_new_module.tar.gz');
   }
 
   /**
@@ -29,16 +34,25 @@ public function testViaAuthorize() {
     // Ensure the that we can select which file transfer backend to use.
     \Drupal::state()->set('test_uploaders_via_prompt', TRUE);
 
+    // Ensure the module does not already exist.
+    $this->drupalGet('admin/modules');
+    $this->assertNoText('Update test new module');
+
     $edit = [
-      'project_url' => 'https://ftp.drupal.org/files/projects/config_inspector-8.x-1.0-beta1.tar.gz',
+      // This project has been cached in the test's setUp() method.
+      'project_url' => 'https://ftp.drupal.org/files/projects/update_test_new_module.tar.gz',
     ];
-    $this->drupalPostForm('http://drupal8alt.dev/admin/modules/install', $edit, t('Install'));
+    $this->drupalPostForm('admin/modules/install', $edit, t('Install'));
     $edit = [
       'connection_settings[authorize_filetransfer_default]' => 'system_test',
       'connection_settings[system_test][update_test_username]' => $this->randomMachineName(),
     ];
     $this->drupalPostForm(NULL, $edit, t('Continue'));
     $this->assertText(t('Installation was completed successfully.'));
+
+    // Ensure the module is available to install.
+    $this->drupalGet('admin/modules');
+    $this->assertText('Update test new module');
   }
 
 }