diff --git a/core/modules/datetime/lib/Drupal/datetime/Tests/DateTimeFieldTest.php b/core/modules/datetime/lib/Drupal/datetime/Tests/DateTimeFieldTest.php
index 76b4cb9..ec62ca3 100644
--- a/core/modules/datetime/lib/Drupal/datetime/Tests/DateTimeFieldTest.php
+++ b/core/modules/datetime/lib/Drupal/datetime/Tests/DateTimeFieldTest.php
@@ -69,6 +69,7 @@ function setUp() {
       'field_name' => $this->field->name,
       'entity_type' => 'entity_test',
       'bundle' => 'entity_test',
+      'required' => TRUE,
     ));
     $this->instance->save();
 
@@ -97,6 +98,7 @@ function testDateField() {
     // Display creation form.
     $this->drupalGet('entity_test/add');
     $this->assertFieldByName("{$field_name}[0][value][date]", '', 'Date element found.');
+    $this->assertFieldByXPath('//*[@id="' . $field_name . '-add-more-wrapper"]/h4/span', '*', 'Required markup found');
     $this->assertNoFieldByName("{$field_name}[0][value][time]", '', 'Time element not found.');
 
     // Submit a valid date and ensure it is accepted.