diff --git a/core/modules/link/src/Tests/LinkFieldTest.php b/core/modules/link/src/Tests/LinkFieldTest.php
index bfca381..c369716 100644
--- a/core/modules/link/src/Tests/LinkFieldTest.php
+++ b/core/modules/link/src/Tests/LinkFieldTest.php
@@ -597,9 +597,9 @@ protected function renderTestEntity($id, $view_mode = 'full', $reset = TRUE) {
   }
 
   /**
-   * Tests if the link text is required.
+   * Tests if the URL and the link text are both required.
    */
-  function testRequiredLinkText() {
+  function testRequiredURLAndLinkText() {
     $field_name = Unicode::strtolower($this->randomMachineName());
     // Create a field with settings to validate.
     FieldStorageConfig::create([
@@ -635,4 +635,44 @@ function testRequiredLinkText() {
     $this->assertEqual(count($result), 1, "Link text is marked as required when the link field is set to required.");
   }
 
+  /**
+   * Tests if the URL is not required, but link text is required.
+   */
+  function testRequiredLinkTextOnly() {
+    $field_name = Unicode::strtolower($this->randomMachineName());
+    // Create a field with settings to validate.
+    FieldStorageConfig::create([
+      'field_name' => $field_name,
+      'entity_type' => 'entity_test',
+      'type' => 'link',
+    ])->save();
+    FieldConfig::create([
+      'field_name' => $field_name,
+      'entity_type' => 'entity_test',
+      'bundle' => 'entity_test',
+      'label' => 'Read more about this entity',
+      'required' => FALSE,
+      'settings' => [
+        'title' => DRUPAL_REQUIRED,
+        'link_type' => LinkItemInterface::LINK_GENERIC,
+      ],
+    ])->save();
+    EntityFormDisplay::load('entity_test.entity_test.default')
+      ->setComponent($field_name, [
+        'type' => 'link_default',
+        'settings' => [
+          'placeholder_url' => 'http://example.com',
+          'placeholder_title' => 'Enter the text for this link',
+        ],
+      ])
+      ->save();
+
+    // Display creation form.
+    $edit = ["{$field_name}[0][uri]" => 'http://www.example.com'];
+    $this->drupalPostForm('entity_test/add', $edit, t('Save'));
+
+    $result = $this->xpath('//label[contains(@class, :class) and contains(text(), :text)]', [':class' => 'form-required', ':text' => 'Link text']);
+    $this->assertEqual(count($result), 1, "Link text is marked as required when the link field is set to required.");
+  }
+
 }