class CheckboxTest

class CheckboxTest extends BrowserTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'form_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  public function testFormCheckbox() {
    // Ensure that the checked state is determined and rendered correctly for
    // tricky combinations of default and return values.
    foreach ([
      FALSE,
      NULL,
      TRUE,
      0,
      '0',
      '',
      1,
      '1',
      'foobar',
      '1foobar',
    ] as $default_value) {
      // Only values that can be used for array indices are supported for
      // #return_value, with the exception of integer 0, which is not supported.
      // @see \Drupal\Core\Render\Element\Checkbox::processCheckbox().
      foreach ([
        '0',
        '',
        1,
        '1',
        'foobar',
        '1foobar',
      ] as $return_value) {
        $form_array = \Drupal::formBuilder()->getForm('\\Drupal\\form_test\\Form\\FormTestCheckboxTypeJugglingForm', $default_value, $return_value);
        $form = \Drupal::service('renderer')->renderRoot($form_array);
        if ($default_value === TRUE) {
          $checked = TRUE;
        }
        elseif ($return_value === '0') {
          $checked = $default_value === '0';
        }
        elseif ($return_value === '') {
          $checked = $default_value === '';
        }
        elseif ($return_value === 1 || $return_value === '1') {
          $checked = $default_value === 1 || $default_value === '1';
        }
        elseif ($return_value === 'foobar') {
          $checked = $default_value === 'foobar';
        }
        elseif ($return_value === '1foobar') {
          $checked = $default_value === '1foobar';
        }
        $checked_in_html = strpos($form, 'checked') !== FALSE;
        $message = new FormattableMarkup('#default_value is %default_value #return_value is %return_value.', [
          '%default_value' => var_export($default_value, TRUE),
          '%return_value' => var_export($return_value, TRUE),
        ]);
        $this->assertSame($checked, $checked_in_html, $message);
      }
    }
    // Ensure that $form_state->getValues() is populated correctly for a
    // checkboxes group that includes a 0-indexed array of options.
    $this->drupalGet('form-test/checkboxes-zero/1');
    $this->submitForm([], 'Save');
    $results = json_decode($this->getSession()
      ->getPage()
      ->getContent());
    $this->assertSame([
      0,
      0,
      0,
    ], $results->checkbox_off, 'All three in checkbox_off are zeroes: off.');
    $this->assertSame([
      '0',
      0,
      0,
    ], $results->checkbox_zero_default, 'The first choice is on in checkbox_zero_default');
    $this->assertSame([
      '0',
      0,
      0,
    ], $results->checkbox_string_zero_default, 'The first choice is on in checkbox_string_zero_default');
    // Due to Mink driver differences, we cannot submit an empty checkbox value
    // to submitForm(), even if that empty value is the 'true' value for
    // the checkbox.
    $this->drupalGet('form-test/checkboxes-zero/1');
    $this->assertSession()
      ->fieldExists('checkbox_off[0]')
      ->check();
    $this->submitForm([], 'Save');
    $results = json_decode($this->getSession()
      ->getPage()
      ->getContent());
    $this->assertSame([
      '0',
      0,
      0,
    ], $results->checkbox_off, 'The first choice is on in checkbox_off but the rest is not');
    // Ensure that each checkbox is rendered correctly for a checkboxes group
    // that includes a 0-indexed array of options.
    $this->drupalGet('form-test/checkboxes-zero/0');
    $this->submitForm([], 'Save');
    $checkboxes = $this->xpath('//input[@type="checkbox"]');
    $this->assertCount(9, $checkboxes, 'Correct number of checkboxes found.');
    foreach ($checkboxes as $checkbox) {
      $checked = $checkbox->isChecked();
      $name = $checkbox->getAttribute('name');
      $this->assertSame($checked, $name == 'checkbox_zero_default[0]' || $name == 'checkbox_string_zero_default[0]', new FormattableMarkup('Checkbox %name correctly checked', [
        '%name' => $name,
      ]));
    }
    // Due to Mink driver differences, we cannot submit an empty checkbox value
    // to submitForm(), even if that empty value is the 'true' value for
    // the checkbox.
    $this->drupalGet('form-test/checkboxes-zero/0');
    $this->assertSession()
      ->fieldExists('checkbox_off[0]')
      ->check();
    $this->submitForm([], 'Save');
    $checkboxes = $this->xpath('//input[@type="checkbox"]');
    $this->assertCount(9, $checkboxes, 'Correct number of checkboxes found.');
    foreach ($checkboxes as $checkbox) {
      $checked = $checkbox->isChecked();
      $name = (string) $checkbox->getAttribute('name');
      $this->assertSame($checked, $name == 'checkbox_off[0]' || $name == 'checkbox_zero_default[0]' || $name == 'checkbox_string_zero_default[0]', new FormattableMarkup('Checkbox %name correctly checked', [
        '%name' => $name,
      ]));
    }
  }

}