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
@@ -12,6 +12,9 @@
 use Drupal\Core\Url;
 use Drupal\link\LinkItemInterface;
 use Drupal\simpletest\WebTestBase;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\Core\Entity\Entity\EntityFormDisplay;
 
 /**
  * Tests link field widgets and formatters.
@@ -57,13 +60,13 @@
   function testURLValidation() {
     $field_name = Unicode::strtolower($this->randomMachineName());
     // Create a field with settings to validate.
-    $this->fieldStorage = entity_create('field_storage_config', array(
+    $this->fieldStorage = FieldStorageConfig::create(['field_storage_config', array(
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => 'link',
-    ));
+    )]);
     $this->fieldStorage->save();
-    $this->field = entity_create('field_config', array(
+    $this->field = FieldConfig::create('field_config', array(
       'field_storage' => $this->fieldStorage,
       'bundle' => 'entity_test',
       'settings' => array(
@@ -72,7 +75,7 @@
       ),
     ));
     $this->field->save();
-    entity_get_form_display('entity_test', 'entity_test', 'default')
+    EntityFormDisplay::load('entity_test', 'entity_test', 'default')
       ->setComponent($field_name, array(
         'type' => 'link_default',
         'settings' => array(
@@ -218,13 +221,13 @@
   function testLinkTitle() {
     $field_name = Unicode::strtolower($this->randomMachineName());
     // Create a field with settings to validate.
-    $this->fieldStorage = entity_create('field_storage_config', array(
+    $this->fieldStorage = FieldStorageConfig::create(['field_storage_config', array(
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => 'link',
-    ));
+    )]);
     $this->fieldStorage->save();
-    $this->field = entity_create('field_config', array(
+    $this->field = FieldConfig::create('field_config', array(
       'field_storage' => $this->fieldStorage,
       'bundle' => 'entity_test',
       'label' => 'Read more about this entity',
@@ -234,7 +237,7 @@
       ),
     ));
     $this->field->save();
-    entity_get_form_display('entity_test', 'entity_test', 'default')
+    EntityFormDisplay::load('entity_test', 'entity_test', 'default')
       ->setComponent($field_name, array(
         'type' => 'link_default',
         'settings' => array(
@@ -332,14 +335,14 @@
   function testLinkFormatter() {
     $field_name = Unicode::strtolower($this->randomMachineName());
     // Create a field with settings to validate.
-    $this->fieldStorage = entity_create('field_storage_config', array(
+    $this->fieldStorage = FieldStorageConfig::create(['field_storage_config', array(
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => 'link',
       'cardinality' => 2,
-    ));
+    )]);
     $this->fieldStorage->save();
-    entity_create('field_config', array(
+    FieldConfig::create('field_config', array(
       'field_storage' => $this->fieldStorage,
       'label' => 'Read more about this entity',
       'bundle' => 'entity_test',
@@ -348,7 +351,7 @@
         'link_type' => LinkItemInterface::LINK_GENERIC,
       ),
     ))->save();
-    entity_get_form_display('entity_test', 'entity_test', 'default')
+    EntityFormDisplay::load('entity_test', 'entity_test', 'default')
       ->setComponent($field_name, array(
         'type' => 'link_default',
       ))
@@ -472,14 +475,14 @@
   function testLinkSeparateFormatter() {
     $field_name = Unicode::strtolower($this->randomMachineName());
     // Create a field with settings to validate.
-    $this->fieldStorage = entity_create('field_storage_config', array(
+    $this->fieldStorage = FieldStorageConfig::create(['field_storage_config', array(
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => 'link',
       'cardinality' => 2,
-    ));
+    )]);
     $this->fieldStorage->save();
-    entity_create('field_config', array(
+    FieldConfig::create('field_config', array(
       'field_storage' => $this->fieldStorage,
       'bundle' => 'entity_test',
       'settings' => array(
@@ -491,7 +494,7 @@
       'type' => 'link_separate',
       'label' => 'hidden',
     );
-    entity_get_form_display('entity_test', 'entity_test', 'default')
+    EntityFormDisplay::load('entity_test', 'entity_test', 'default')
       ->setComponent($field_name, array(
         'type' => 'link_default',
       ))
@@ -593,16 +596,19 @@
     $this->verbose($output);
   }
 
+  /**
+   * Check link text is required.
+   */
   function testRequiredLinkText() {
     $field_name = Unicode::strtolower($this->randomMachineName());
     // Create a field with settings to validate.
-    $this->fieldStorage = entity_create('field_storage_config', array(
+    $this->fieldStorage = FieldStorageConfig::create(['field_storage_config', array(
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => 'link',
-    ));
+    )]);
     $this->fieldStorage->save();
-    $this->field = entity_create('field_config', array(
+    $this->field = FieldConfig::create('field_config', array(
       'field_storage' => $this->fieldStorage,
       'bundle' => 'entity_test',
       'label' => 'Read more about this entity',
@@ -613,7 +619,7 @@
       ),
     ));
     $this->field->save();
-    entity_get_form_display('entity_test', 'entity_test', 'default')
+    EntityFormDisplay::load('entity_test', 'entity_test', 'default')
       ->setComponent($field_name, array(
         'type' => 'link_default',
         'settings' => array(
@@ -625,7 +631,7 @@
 
     // Display creation form.
     $this->drupalGet('entity_test/add');
-    $this->drupalPostForm(NULL, array(), t('Save'));
+    $this->drupalPostForm(NULL, [], t('Save'));
 
     $result = $this->xpath('//label[contains(@class, :class) and contains(text(), :text)]', array(':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.");