diff --git a/core/modules/update/src/Tests/UpdateUploadTest.php b/core/modules/update/src/Tests/UpdateUploadTest.php
index 0565ff0..61a8480 100644
--- a/core/modules/update/src/Tests/UpdateUploadTest.php
+++ b/core/modules/update/src/Tests/UpdateUploadTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\update\Tests;
 
+use Drupal\Core\Updater\Updater;
 use Drupal\Core\Url;
 
 /**
@@ -111,4 +112,18 @@ function testUpdateManagerCoreSecurityUpdateMessages() {
     $this->drupalGet('admin/update/ready');
     $this->assertNoText(t('There is a security update available for your version of Drupal.'));
   }
+
+  /**
+   * Tests that modules with only module info.yml files are detected without
+   * a module file.
+   * @covers Module::canUpdateDirectory().
+   */
+  function testUpdateDirectory() {
+    $type = Updater::getUpdaterFromDirectory(\Drupal::root() . '/core/modules/update/tests/modules/aaa_update_test');
+    $this->assertEqual($type, 'Drupal\\Core\\Updater\\Module', 'Detected a Module');
+
+    $type = Updater::getUpdaterFromDirectory(\Drupal::root() . '/core/modules/update/tests/themes/update_test_basetheme');
+    $this->assertEqual($type, 'Drupal\\Core\\Updater\\Theme', 'Detected a Theme.');
+  }
+
 }