class TextFieldItemListTest

class TextFieldItemListTest extends UnitTestCase {
  
  /**
   * Tests ::defaultValuesFormValidate() if the field allows multiple values.
   *
   * Ensures that the add_more button is filtered out of the submitted values
   * before validation, preventing PHP warnings due to trying to access array
   * keys on a TranslatableMarkup object.
   */
  public function testDefaultValuesFormValidateWithMultipleCardinality() : void {
    $field_name = 'field_test_text';
    $definition = $this->createMock(FieldDefinitionInterface::class);
    $definition->expects($this->once())
      ->method('getName')
      ->willReturn($field_name);
    $definition->expects($this->once())
      ->method('getSetting')
      ->with('allowed_formats')
      ->willReturn([
      'restricted_html',
    ]);
    $form_state = $this->createMock(FormStateInterface::class);
    $form_state->expects($this->once())
      ->method('getValue')
      ->with([
      'default_value_input',
      $field_name,
    ])
      ->willReturn([
      'add_more' => new TranslatableMarkup('Add another item'),
    ]);
    $form_state->expects($this->once())
      ->method('has')
      ->with('default_value_widget')
      ->willReturn(TRUE);
    $form_state->expects($this->once())
      ->method('get')
      ->with('default_value_widget')
      ->willReturn([]);
    $item_list = new TextFieldItemList($definition);
    $form = [];
    $item_list->defaultValuesFormValidate([], $form, $form_state);
  }

}