class StateValuesCleanTest

class StateValuesCleanTest extends BrowserTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'form_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Tests \Drupal\Core\Form\FormState::cleanValues().
   */
  public function testFormStateValuesClean() {
    $this->drupalGet('form_test/form-state-values-clean');
    $this->submitForm([], 'Submit');
    $values = Json::decode($this->getSession()
      ->getPage()
      ->getContent());
    // Setup the expected result.
    $result = [
      'beer' => 1000,
      'baz' => [
        'beer' => 2000,
      ],
    ];
    // Verify that all internal Form API elements were removed.
    $this->assertFalse(isset($values['form_id']), new FormattableMarkup('%element was removed.', [
      '%element' => 'form_id',
    ]));
    $this->assertFalse(isset($values['form_token']), new FormattableMarkup('%element was removed.', [
      '%element' => 'form_token',
    ]));
    $this->assertFalse(isset($values['form_build_id']), new FormattableMarkup('%element was removed.', [
      '%element' => 'form_build_id',
    ]));
    $this->assertFalse(isset($values['op']), new FormattableMarkup('%element was removed.', [
      '%element' => 'op',
    ]));
    // Verify that all buttons were removed.
    $this->assertFalse(isset($values['foo']), new FormattableMarkup('%element was removed.', [
      '%element' => 'foo',
    ]));
    $this->assertFalse(isset($values['bar']), new FormattableMarkup('%element was removed.', [
      '%element' => 'bar',
    ]));
    $this->assertFalse(isset($values['baz']['foo']), new FormattableMarkup('%element was removed.', [
      '%element' => 'foo',
    ]));
    $this->assertFalse(isset($values['baz']['baz']), new FormattableMarkup('%element was removed.', [
      '%element' => 'baz',
    ]));
    // Verify values manually added for cleaning were removed.
    $this->assertFalse(isset($values['wine']), new FormattableMarkup('%element was removed.', [
      '%element' => 'wine',
    ]));
    // Verify that nested form value still exists.
    $this->assertTrue(isset($values['baz']['beer']), 'Nested form value still exists.');
    // Verify that actual form values equal resulting form values.
    $this->assertEquals($result, $values, 'Expected form values equal actual form values.');
  }

}