--- /dev/null
+<?php
+
+namespace Drupal\Tests\field\Kernel;
+
+use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\Field\FieldItemInterface;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+
+/**
+ * Tests the new entity API for the test field type.
+ *
+ * @group field
+ */
+class TestItemTest extends FieldKernelTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['field_test'];
+
+ /**
+ * The name of the field to use in this test.
+ *
+ * @var string
+ */
+ protected $fieldName = 'field_test';
+
+ protected function setUp() {
+ parent::setUp();
+
+ // Create a 'test_field' field and storage for validation.
+ FieldStorageConfig::create([
+ 'field_name' => $this->fieldName,
+ 'entity_type' => 'entity_test',
+ 'type' => 'test_field',
+ ])->save();
+ FieldConfig::create([
+ 'entity_type' => 'entity_test',
+ 'field_name' => $this->fieldName,
+ 'bundle' => 'entity_test',
+ ])->save();
+ }
+
+ /**
+ * Tests using entity fields of the field field type.
+ */
+ public function testTestItem() {
+ // Verify entity creation.
+ $entity = EntityTest::create();
+ $value = rand(1, 10);
+ $entity->field_test = $value;
+ $entity->name->value = $this->randomMachineName();
+ $entity->save();
+
+ // Verify entity has been created properly.
+ $id = $entity->id();
+ $entity = EntityTest::load($id);
+ $this->assertTrue($entity->{$this->fieldName} instanceof FieldItemListInterface, 'Field implements interface.');
+ $this->assertTrue($entity->{$this->fieldName}[0] instanceof FieldItemInterface, 'Field item implements interface.');
+ $this->assertEqual($entity->{$this->fieldName}->value, $value);
+ $this->assertEqual($entity->{$this->fieldName}[0]->value, $value);
+
+ // Verify changing the field value.
+ $new_value = rand(1, 10);
+ $entity->field_test->value = $new_value;
+ $this->assertEqual($entity->{$this->fieldName}->value, $new_value);
+
+ // Read changed entity and assert changed values.
+ $entity->save();
+ $entity = EntityTest::load($id);
+ $this->assertEqual($entity->{$this->fieldName}->value, $new_value);
+
+ // Test the schema for this field type.
+ $expected_schema = [
+ 'columns' => [
+ 'value' => [
+ 'type' => 'int',
+ 'size' => 'medium',
+ ],
+ ],
+ 'unique keys' => [],
+ 'indexes' => [
+ 'value' => ['value'],
+ ],
+ 'foreign keys' => [],
+ ];
+ $field_schema = BaseFieldDefinition::create('test_field')->getSchema();
+ $this->assertEqual($field_schema, $expected_schema);
+ }
+
+}