class RebuildTest

class RebuildTest extends BrowserTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'node',
    'form_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * A user for testing.
   *
   * @var \Drupal\user\UserInterface
   */
  protected $webUser;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalCreateContentType([
      'type' => 'page',
      'name' => 'Basic page',
    ]);
    $this->webUser = $this->drupalCreateUser([
      'access content',
    ]);
    $this->drupalLogin($this->webUser);
  }
  
  /**
   * Tests preservation of values.
   */
  public function testRebuildPreservesValues() {
    $edit = [
      'checkbox_1_default_off' => TRUE,
      'checkbox_1_default_on' => FALSE,
      'text_1' => 'foo',
    ];
    $this->drupalGet('form-test/form-rebuild-preserve-values');
    $this->submitForm($edit, 'Add more');
    $assert_session = $this->assertSession();
    // Verify that initial elements retained their submitted values.
    $assert_session->checkboxChecked('edit-checkbox-1-default-off');
    $assert_session->checkboxNotChecked('edit-checkbox-1-default-on');
    $assert_session->fieldValueEquals('edit-text-1', 'foo');
    // Verify that newly added elements were initialized with their default values.
    $assert_session->checkboxChecked('edit-checkbox-2-default-on');
    $assert_session->checkboxNotChecked('edit-checkbox-2-default-off');
    $assert_session->fieldValueEquals('edit-text-2', 'DEFAULT 2');
  }

}