diff -u b/core/modules/link/src/Tests/LinkFieldTest.php b/core/modules/link/src/Tests/LinkFieldTest.php
--- b/core/modules/link/src/Tests/LinkFieldTest.php
+++ b/core/modules/link/src/Tests/LinkFieldTest.php
@@ -602,14 +602,14 @@
   function testRequiredLinkText() {
     $field_name = Unicode::strtolower($this->randomMachineName());
     // Create a field with settings to validate.
-    $this->fieldStorage = FieldStorageConfig::create([
+    FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => 'link',
-    ]);
-    $this->fieldStorage->save();
-    $this->field = FieldConfig::create([
-      'field_storage' => $this->fieldStorage,
+    ])->save();
+    FieldConfig::create([
+      'field_name' => $field_name,
+      'entity_type' => 'entity_test',
       'bundle' => 'entity_test',
       'label' => 'Read more about this entity',
       'required' => TRUE,
@@ -618,24 +618,22 @@
         'link_type' => LinkItemInterface::LINK_GENERIC,
       ],
-    ]);
-    $this->field->save();
+    ])->save();
     EntityFormDisplay::load('entity_test.entity_test.default')
-      ->setComponent($field_name, array(
+      ->setComponent($field_name, [
         'type' => 'link_default',
         'settings' => [
           'placeholder_url' => 'http://example.com',
           'placeholder_title' => 'Enter the text for this link',
         ],
-      ))
+      ])
       ->save();
 
     // Display creation form.
-    $this->drupalGet('entity_test/add');
-    $this->drupalPostForm(NULL, [], t('Save'));
+    $this->drupalPostForm('entity_test/add', [], t('Save'));
 
-    $result = $this->xpath('//label[contains(@class, :class) and contains(text(), :text)]', array(':class' => 'form-required', ':text' => 'Link text'));
+    $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.");
-    $this->assertText(t('@url field is required.', array('@url' => t('URL'))));
-    $this->assertText(t('@name field is required.', array('@name' => t('Link text'))));
+    $this->assertText(t('@url field is required.', ['@url' => t('URL')]));
+    $this->assertText(t('@name field is required.', ['@name' => t('Link text')]));
   }
 }