diff --git a/config/schema/metatag.schema.yml b/config/schema/metatag.schema.yml
new file mode 100644
index 0000000..29c79e8
--- /dev/null
+++ b/config/schema/metatag.schema.yml
@@ -0,0 +1,8 @@
+# Schema for metatag
+field.value.metatag:
+  type: mapping
+  label: 'Default value'
+  mapping:
+    value:
+      type: string
+      label: 'Metatags'
diff --git a/src/Plugin/Field/FieldType/MetatagFieldItem.php b/src/Plugin/Field/FieldType/MetatagFieldItem.php
index a6fa392..4eb3c64 100644
--- a/src/Plugin/Field/FieldType/MetatagFieldItem.php
+++ b/src/Plugin/Field/FieldType/MetatagFieldItem.php
@@ -45,15 +45,6 @@ class MetatagFieldItem extends FieldItemBase {
   /**
    * {@inheritdoc}
    */
-  public static function defaultStorageSettings() {
-    return array(
-      'max_length' => 255,
-    ) + parent::defaultStorageSettings();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
     $properties['value'] = DataDefinition::create('string')
       ->setLabel(t('Metatag'))
diff --git a/src/Tests/MetatagTest.php b/src/Tests/MetatagTest.php
new file mode 100644
index 0000000..3fdd37c
--- /dev/null
+++ b/src/Tests/MetatagTest.php
@@ -0,0 +1,183 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\metatag\Tests\MetatagTest.
+ */
+
+namespace Drupal\metatag\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Ensures that the metatag field works correctly.
+ *
+ * @group metatag
+ */
+class MetatagTest extends WebTestBase {
+
+  /**
+   * Profile to use.
+   */
+  protected $profile = 'testing';
+
+  /**
+   * Admin user
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $adminUser;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = [
+    'field_ui',
+    'metatag',
+    'entity_test',
+  ];
+
+  /**
+   * Permissions to grant admin user.
+   *
+   * @var array
+   */
+  protected $permissions = [
+    'access administration pages',
+    'view test entity',
+    'administer entity_test fields',
+    'administer entity_test content',
+    'administer meta tags',
+  ];
+
+  /**
+   * Sets the test up.
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->adminUser = $this->drupalCreateUser($this->permissions);
+  }
+
+  /**
+   * Tests adding and editing values using metatag.
+   */
+  public function testMetatag() {
+    $this->drupalLogin($this->adminUser);
+    // Add a new metatag field.
+    $this->drupalGet('entity_test/structure/entity_test/fields/add-field');
+    $edit = [
+      'label' => 'Metatag',
+      'field_name' => 'metatag',
+      'new_storage_type' => 'metatag',
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save and continue'));
+    // Cardinality should not be editable.
+    $elements = $this->cssSelect('select[name=cardinality]');
+    $element = reset($elements);
+    $this->assertTrue(count($elements) === 1, 'Found cardinality field');
+    $this->assertEqual($element['disabled'], 'disabled', 'Cardinality is disabled');
+    $this->drupalPostForm(NULL, [], t('Save field settings'));
+
+    $this->drupalPostForm(NULL, [
+      'default_value_input[field_metatag][0][basic][keywords]' => 'Purple monkey dishwasher',
+    ], t('Save settings'));
+    $this->assertRaw(t('Saved %name configuration', ['%name' => 'Metatag']));
+
+    // Test the fields values/widget.
+    $this->drupalGet('entity_test/add');
+    $this->assertFieldByName('field_metatag[0][basic][keywords]', 'Purple monkey dishwasher', 'Found metatag field metatag');
+
+    // Submit with no metatags, should use defaults.
+    $default_entity = $this->doTestDefaultMetatags();
+
+    // Submit with specific metatags.
+    $this->drupalGet('entity_test/add');
+    $this->doTestOverriddenMetatags();
+
+    // Change defaults.
+    $this->drupalPostForm('entity_test/structure/entity_test/fields/entity_test.entity_test.field_metatag', [
+      'default_value_input[field_metatag][0][basic][keywords]' => "I don't own a gun let alone several",
+    ], t('Save settings'));
+
+    // Test new defaults applied.
+    $this->drupalGet('entity_test/' . $default_entity->id());
+    $elements = $this->cssSelect('meta[name=keywords]');
+    $this->assertTrue(count($elements) === 1, 'Found keywords metatag from defaults');
+    // @todo Uncomment in https://www.drupal.org/node/2581351.
+    // $this->assertEqual((string) $elements[0]['content'], "I don't own a gun let alone several", 'Default keywords applied');
+
+    // @todo Uncomment in https://www.drupal.org/node/2576695.
+    // $this->doTestUrlMetatags();
+  }
+
+  /**
+   * Tests default metatags are applied.
+   */
+  protected function doTestDefaultMetatags() {
+    $edit = [
+      'name[0][value]' => 'Barfoo',
+      'user_id[0][target_id]' => 'foo (' . $this->adminUser->id() . ')',
+    ];
+
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+    $entities = entity_load_multiple_by_properties('entity_test', [
+      'name' => 'Barfoo',
+    ]);
+    $this->assertEqual(1, count($entities), 'Entity was saved');
+    $entity = reset($entities);
+    $this->drupalGet('entity_test/' . $entity->id());
+    $elements = $this->cssSelect('meta[name=keywords]');
+    $this->assertTrue(count($elements) === 1, 'Found keywords metatag from defaults');
+    $this->assertEqual((string) $elements[0]['content'], 'Purple monkey dishwasher', 'Default keywords applied');
+    return $entity;
+  }
+
+  /**
+   * Tests overridden metatags are applied.
+   */
+  protected function doTestOverriddenMetatags() {
+    $edit = [
+      'name[0][value]' => 'Wizwang',
+      'user_id[0][target_id]' => 'foo (' . $this->adminUser->id() . ')',
+      'field_metatag[0][basic][keywords]' => 'She was like yes way and I was like no way and she was like shut-up',
+    ];
+
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+    $entities = entity_load_multiple_by_properties('entity_test', [
+      'name' => 'Wizwang',
+    ]);
+    $this->assertEqual(1, count($entities), 'Entity was saved');
+    $entity = reset($entities);
+    $this->drupalGet('entity_test/' . $entity->id());
+    $elements = $this->cssSelect('meta[name=keywords]');
+    $this->assertTrue(count($elements) === 1, 'Found keywords metatag from defaults');
+    $this->assertEqual((string) $elements[0]['content'], 'She was like yes way and I was like no way and she was like shut-up', 'Overridden keywords applied');
+    return $entity;
+  }
+
+  /**
+   * Tests metatags with urls work.
+   */
+  protected function doTestUrlMetatags() {
+    $edit = [
+      'name[0][value]' => 'UrlTags',
+      'user_id[0][target_id]' => 'foo (' . $this->adminUser->id() . ')',
+      'field_metatag[0][open_graph][og_url]' => 'http://example.com/foo.html',
+    ];
+
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+    $entities = entity_load_multiple_by_properties('entity_test', [
+      'name' => 'UrlTags',
+    ]);
+    $this->assertEqual(1, count($entities), 'Entity was saved');
+    $entity = reset($entities);
+    $this->drupalGet('entity_test/' . $entity->id());
+    $elements = $this->cssSelect("meta[property='og:url']");
+    $this->assertTrue(count($elements) === 1, 'Found keywords metatag from defaults');
+    $this->assertEqual((string) $elements[0]['content'], 'http://example.com/foo.html');
+    return $entity;
+  }
+
+}