diff --git a/core/modules/field_sql_storage/lib/Drupal/field_sql_storage/Tests/FieldSqlStorageTest.php b/core/modules/field_sql_storage/lib/Drupal/field_sql_storage/Tests/FieldSqlStorageTest.php
index 3598446..d12b334 100644
--- a/core/modules/field_sql_storage/lib/Drupal/field_sql_storage/Tests/FieldSqlStorageTest.php
+++ b/core/modules/field_sql_storage/lib/Drupal/field_sql_storage/Tests/FieldSqlStorageTest.php
@@ -41,14 +41,18 @@ function setUp() {
     $this->installSchema('field_test', array('test_entity', 'test_entity_revision', 'test_entity_bundle'));
 
     $this->field_name = strtolower($this->randomName());
-    $this->field = array('field_name' => $this->field_name, 'type' => 'test_field', 'cardinality' => 4);
-    $this->field = field_create_field($this->field);
-    $this->instance = array(
+    $this->field = entity_create('field_entity', array(
+      'field_name' => $this->field_name,
+      'type' => 'test_field',
+      'cardinality' => 4,
+    ));
+    $this->field->save();
+    $this->instance = entity_create('field_instance', array(
       'field_name' => $this->field_name,
       'entity_type' => 'test_entity',
       'bundle' => 'test_bundle'
-    );
-    $this->instance = field_create_instance($this->instance);
+    ));
+    $this->instance->save();
     $this->table = _field_sql_storage_tablename($this->field);
     $this->revision_table = _field_sql_storage_revision_tablename($this->field);
 
@@ -305,10 +309,18 @@ function testFieldAttachSaveMissingData() {
    */
   function testUpdateFieldSchemaWithData() {
     // Create a decimal 5.2 field and add some data.
-    $field = array('field_name' => 'decimal52', 'type' => 'number_decimal', 'settings' => array('precision' => 5, 'scale' => 2));
-    $field = field_create_field($field);
-    $instance = array('field_name' => 'decimal52', 'entity_type' => 'test_entity', 'bundle' => 'test_bundle');
-    $instance = field_create_instance($instance);
+    $field = entity_create('field_entity', array(
+      'field_name' => 'decimal52',
+      'type' => 'number_decimal',
+      'settings' => array('precision' => 5, 'scale' => 2),
+    ));
+    $field->save();
+    $instance = entity_create('field_instance', array(
+      'field_name' => 'decimal52',
+      'entity_type' => 'test_entity',
+      'bundle' => 'test_bundle',
+    ));
+    $instance->save();
     $entity = field_test_create_entity(0, 0, $instance['bundle']);
     $entity->decimal52[Language::LANGCODE_NOT_SPECIFIED][0]['value'] = '1.235';
     $entity->save();
@@ -316,7 +328,7 @@ function testUpdateFieldSchemaWithData() {
     // Attempt to update the field in a way that would work without data.
     $field['settings']['scale'] = 3;
     try {
-      field_update_field($field);
+      $field->save();
       $this->fail(t('Cannot update field schema with data.'));
     }
     catch (FieldException $e) {
@@ -329,14 +341,18 @@ function testUpdateFieldSchemaWithData() {
    */
   function testFieldUpdateFailure() {
     // Create a text field.
-    $field = array('field_name' => 'test_text', 'type' => 'text', 'settings' => array('max_length' => 255));
-    $field = field_create_field($field);
+    $field = entity_create('field_entity', array(
+      'field_name' => 'test_text',
+      'type' => 'text',
+      'settings' => array('max_length' => 255),
+    ));
+    $field->save();
 
     // Attempt to update the field in a way that would break the storage.
     $prior_field = $field;
     $field['settings']['max_length'] = -1;
     try {
-      field_update_field($field);
+      $field->save();
       $this->fail(t('Update succeeded.'));
     }
     catch (\Exception $e) {
@@ -356,10 +372,14 @@ function testFieldUpdateIndexesWithData() {
 
     // Create a decimal field.
     $field_name = 'testfield';
-    $field = array('field_name' => $field_name, 'type' => 'text');
-    $field = field_create_field($field);
-    $instance = array('field_name' => $field_name, 'entity_type' => 'test_entity', 'bundle' => 'test_bundle');
-    $instance = field_create_instance($instance);
+    $field = entity_create('field_entity', array('field_name' => $field_name, 'type' => 'text'));
+    $field->save();
+    $instance = entity_create('field_instance', array(
+      'field_name' => $field_name,
+      'entity_type' => 'test_entity',
+      'bundle' => 'test_bundle',
+    ));
+    $instance->save();
     $tables = array(_field_sql_storage_tablename($field), _field_sql_storage_revision_tablename($field));
 
     // Verify the indexes we will create do not exist yet.
@@ -373,16 +393,16 @@ function testFieldUpdateIndexesWithData() {
     $entity->{$field_name}[Language::LANGCODE_NOT_SPECIFIED][0]['value'] = 'field data';
     $entity->save();
 
-    // Add an index
-    $field = array('field_name' => $field_name, 'indexes' => array('value' => array(array('value', 255))));
-    field_update_field($field);
+    // Add an index.
+    $field['indexes'] = array('value' => array(array('value', 255)));
+    $field->save();
     foreach ($tables as $table) {
       $this->assertTrue(Database::getConnection()->schema()->indexExists($table, "{$field_name}_value"), t("Index on value created in $table"));
     }
 
     // Add a different index, removing the existing custom one.
-    $field = array('field_name' => $field_name, 'indexes' => array('value_format' => array(array('value', 127), array('format', 127))));
-    field_update_field($field);
+    $field['indexes'] = array('value_format' => array(array('value', 127), array('format', 127)));
+    $field->save();
     foreach ($tables as $table) {
       $this->assertTrue(Database::getConnection()->schema()->indexExists($table, "{$field_name}_value_format"), t("Index on value_format created in $table"));
       $this->assertFalse(Database::getConnection()->schema()->indexExists($table, "{$field_name}_value"), t("Index on value removed in $table"));
@@ -430,18 +450,21 @@ function testFieldSqlStorageForeignKeys() {
     // field_test_field_schema()).
     $field_name = 'testfield';
     $foreign_key_name = 'shape';
-    $field = array('field_name' => $field_name, 'type' => 'shape', 'settings' => array('foreign_key_name' => $foreign_key_name));
-    field_create_field($field);
+    $field = entity_create('field_entity', array(
+      'field_name' => $field_name,
+      'type' => 'shape',
+      'settings' => array('foreign_key_name' => $foreign_key_name),
+    ));
+    $field->save();
 
     // Retrieve the field definition and check that the foreign key is in place.
-    $field = field_info_field($field_name);
     $this->assertEqual($field['foreign keys'][$foreign_key_name]['table'], $foreign_key_name, 'Foreign key table name preserved through CRUD');
     $this->assertEqual($field['foreign keys'][$foreign_key_name]['columns'][$foreign_key_name], 'id', 'Foreign key column name preserved through CRUD');
 
     // Update the field settings, it should update the foreign key definition too.
     $foreign_key_name = 'color';
     $field['settings']['foreign_key_name'] = $foreign_key_name;
-    field_update_field($field);
+    $field->save();
 
     // Retrieve the field definition and check that the foreign key is in place.
     $field = field_info_field($field_name);
diff --git a/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php b/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php
index 51dc8b1..7c89cce 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageDisplayTest.php
@@ -207,7 +207,7 @@ function testNoFieldsDisplayOverview() {
     $this->drupalCreateContentType(array('type' => 'no_fields', 'name' => 'No fields'));
 
     // Remove the 'body' field.
-    field_delete_instance(field_info_instance('node', 'body', 'no_fields'));
+    field_info_instance('node', 'body', 'no_fields')->delete();
 
     $this->drupalGet('admin/structure/types/manage/no_fields/display');
     $this->assertRaw(t('There are no fields yet added. You can add new fields on the <a href="@link">Manage fields</a> page.', array('@link' => url('admin/structure/types/manage/no_fields/fields'))));
diff --git a/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageFieldsTest.php b/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageFieldsTest.php
index 3b49b57..c621ea1 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageFieldsTest.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageFieldsTest.php
@@ -45,7 +45,7 @@ function setUp() {
       'field_name' => 'field_' . $vocabulary->id(),
       'type' => 'taxonomy_term_reference',
     );
-    field_create_field($field);
+    entity_create('field_entity', $field)->save();
 
     $instance = array(
       'field_name' => 'field_' . $vocabulary->id(),
@@ -53,7 +53,7 @@ function setUp() {
       'label' => 'Tags',
       'bundle' => 'article',
     );
-    field_create_instance($instance);
+    entity_create('field_instance', $instance)->save();
 
     entity_get_form_display('node', 'article', 'default')
       ->setComponent('field_' . $vocabulary->id())
@@ -250,17 +250,15 @@ function assertFieldSettings($bundle, $field_name, $string = 'dummy test string'
   function testDefaultValue() {
     // Create a test field and instance.
     $field_name = 'test';
-    $field = array(
+    entity_create('field_entity', array(
       'field_name' => $field_name,
       'type' => 'test_field'
-    );
-    field_create_field($field);
-    $instance = array(
+    ))->save();
+    $instance = entity_create('field_instance', array(
       'field_name' => $field_name,
       'entity_type' => 'node',
       'bundle' => $this->type,
-    );
-    $instance = field_create_instance($instance);
+    ))->save();
 
     entity_get_form_display('node', $this->type, 'default')
       ->setComponent($field_name)
@@ -401,14 +399,14 @@ function testHiddenFields() {
 
     // Create a field and an instance programmatically.
     $field_name = 'hidden_test_field';
-    field_create_field(array('field_name' => $field_name, 'type' => $field_name));
+    entity_create('field_entity', array('field_name' => $field_name, 'type' => $field_name))->save();
     $instance = array(
       'field_name' => $field_name,
       'bundle' => $this->type,
       'entity_type' => 'node',
       'label' => t('Hidden field'),
     );
-    field_create_instance($instance);
+    entity_create('field_instance', $instance)->save();
     entity_get_form_display('node', $this->type, 'default')
       ->setComponent($field_name)
       ->save();