diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/UriItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/UriItem.php
index 1574059..1481d88 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/UriItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/UriItem.php
@@ -33,6 +33,7 @@ class UriItem extends StringItem {
    */
   public static function defaultStorageSettings() {
     $storage_settings = parent::defaultStorageSettings();
+    // is_ascii doesn't make sense for URIs.
     unset($storage_settings['is_ascii']);
     $storage_settings['max_length'] = 2048;
     return $storage_settings;
diff --git a/core/modules/field/src/Tests/Uri/UriFieldTest.php b/core/modules/field/src/Tests/Uri/UriItemTest.php
similarity index 87%
rename from core/modules/field/src/Tests/Uri/UriFieldTest.php
rename to core/modules/field/src/Tests/Uri/UriItemTest.php
index bf2b704..46ffe0a 100644
--- a/core/modules/field/src/Tests/Uri/UriFieldTest.php
+++ b/core/modules/field/src/Tests/Uri/UriItemTest.php
@@ -2,18 +2,15 @@
 
 /**
  * @file
- * Contains \Drupal\field\Tests\Uri\UriFieldTest.
+ * Contains \Drupal\field\Tests\Uri\UriItemTest.
  */
 
 namespace Drupal\field\Tests\Uri;
 
 use Drupal\Component\Utility\Unicode;
-use Drupal\Core\Entity\Entity\EntityFormDisplay;
-use Drupal\Core\Entity\Entity\EntityViewDisplay;
 use Drupal\field\Entity\FieldConfig;
 use Drupal\field\Entity\FieldStorageConfig;
 use Drupal\field\Tests\FieldUnitTestBase;
-use Drupal\simpletest\WebTestBase;
 
 /**
  * Tests URI field functionality.
@@ -22,7 +19,7 @@
  *
  * @group field
  */
-class UriFieldTest extends FieldUnitTestBase {
+class UriItemTest extends FieldUnitTestBase {
 
   /**
    * A field to use in this test class.