diff --git a/core/modules/link/src/Tests/LinkFieldUiHelptextTest.php b/core/modules/link/src/Tests/LinkFieldUiHelptextTest.php
new file mode 100644
index 0000000..730b32f
--- /dev/null
+++ b/core/modules/link/src/Tests/LinkFieldUiHelptextTest.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ * Contains Drupal\link\Tests\LinkFieldUiHelptextTest.
+ */
+
+namespace Drupal\link\Tests;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\field_ui\Tests\FieldUiTestTrait;
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests link field UI helptexts display.
+ *
+ * @group link
+ */
+class LinkFieldUiHelptextTest extends WebTestBase {
+
+  use FieldUiTestTrait;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['node', 'link', 'field_ui'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalLogin($this->drupalCreateUser(['administer content types', 'administer node fields', 'administer node display']));
+  }
+
+  /**
+   * Tests external only help text displays.
+   */
+  function testFieldUiHelptext() {
+    // Add a content type.
+    $type = $this->drupalCreateContentType();
+    $type_path = 'admin/structure/types/manage/' . $type->id();
+    $add_path = 'node/add/' . $type->id();
+
+    // Add a link field to the newly-created type.
+    $label = $this->randomMachineName();
+    $field_name = Unicode::strtolower($label);
+    $this->fieldUIAddNewField($type_path, $field_name, $label, 'link');
+
+    $this->drupalLogin($this->drupalCreateUser(['create ' . $type->id() . ' content']));
+    $this->drupalGet($add_path);
+    $this->assertRaw('You can also enter an internal path such as <em class="placeholder">/node/add</em> or an external URL such as <em class="placeholder">http://example.com</em>.');
+  }
+
+}