class EmailFieldTest

class EmailFieldTest extends BrowserTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'node',
    'entity_test',
    'field_ui',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * A field storage to use in this test class.
   *
   * @var \Drupal\field\Entity\FieldStorageConfig
   */
  protected $fieldStorage;
  
  /**
   * The field used in this test class.
   *
   * @var \Drupal\field\Entity\FieldConfig
   */
  protected $field;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalLogin($this->drupalCreateUser([
      'view test entity',
      'administer entity_test content',
      'administer content types',
    ]));
  }
  
  /**
   * Tests email field.
   */
  public function testEmailField() {
    // Create a field with settings to validate.
    $field_name = mb_strtolower($this->randomMachineName());
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'email',
    ]);
    $this->fieldStorage
      ->save();
    $this->field = FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'bundle' => 'entity_test',
    ]);
    $this->field
      ->save();
    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
    $display_repository = \Drupal::service('entity_display.repository');
    // Create a form display for the default form mode.
    $display_repository->getFormDisplay('entity_test', 'entity_test')
      ->setComponent($field_name, [
      'type' => 'email_default',
      'settings' => [
        'placeholder' => 'example@example.com',
      ],
    ])
      ->save();
    // Create a display for the full view mode.
    $display_repository->getViewDisplay('entity_test', 'entity_test', 'full')
      ->setComponent($field_name, [
      'type' => 'email_mailto',
    ])
      ->save();
    // Display creation form.
    $this->drupalGet('entity_test/add');
    $this->assertSession()
      ->fieldValueEquals("{$field_name}[0][value]", '');
    $this->assertSession()
      ->responseContains('placeholder="example@example.com"');
    // Submit a valid email address and ensure it is accepted.
    $value = 'test@example.com';
    $edit = [
      "{$field_name}[0][value]" => $value,
    ];
    $this->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this->getUrl(), $match);
    $id = $match[1];
    $this->assertSession()
      ->pageTextContains('entity_test ' . $id . ' has been created.');
    $this->assertSession()
      ->responseContains($value);
    // Verify that a mailto link is displayed.
    $entity = EntityTest::load($id);
    $display = $display_repository->getViewDisplay($entity->getEntityTypeId(), $entity->bundle(), 'full');
    $content = $display->build($entity);
    $rendered_content = (string) \Drupal::service('renderer')->renderRoot($content);
    $this->assertStringContainsString('href="mailto:test@example.com"', $rendered_content);
  }

}