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() : void {
        // Create a field with settings to validate.
        $field_name = $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);
        // Test Email validation message.
        $this->drupalGet('entity_test/add');
        $value = 'abc.@in';
        $edit = [
            "{$field_name}[0][value]" => $value,
        ];
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->statusMessageContains("The email address {$value} is not valid. Use the format user@example.com.", 'error');
    }

}