class DateTimeFormInjectionTest

class DateTimeFormInjectionTest extends KernelTestBase implements FormInterface {
    use DependencySerializationTrait;
    
    /**
     * A Dblog logger instance.
     *
     * @var \Psr\Log\LoggerInterface
     */
    protected $logger;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
        'datetime',
    ];
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'datetime_test_injection_form';
    }
    
    /**
     * Process callback.
     *
     * @param array $element
     *   Form element.
     *
     * @return array
     *   Processed element.
     */
    public function process($element) {
        return $element;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['datelist_element'] = [
            '#title' => 'datelist test',
            '#type' => 'datelist',
            '#default_value' => new DrupalDateTime('2000-01-01 00:00:00'),
            '#date_part_order' => [
                'month',
                'day',
                'year',
                'hour',
                'minute',
                'ampm',
            ],
            '#date_text_parts' => [
                'year',
            ],
            '#date_year_range' => '2010:2020',
            '#date_increment' => 15,
        ];
        $form['#process'][] = [
            $this,
            'process',
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->assertTrue(TRUE);
        $form_state->setRebuild();
    }
    
    /**
     * Tests custom string injection serialization.
     */
    public function testDatetimeSerialization() : void {
        $form_state = new FormState();
        $form_state->setRequestMethod('POST');
        $form_state->setCached();
        $form_builder = $this->container
            ->get('form_builder');
        $form_id = $form_builder->getFormId($this, $form_state);
        $form = $form_builder->retrieveForm($form_id, $form_state);
        $form_builder->prepareForm($form_id, $form, $form_state);
        // Set up $form_state so that the form is properly submitted.
        $form_state->setUserInput([
            'form_id' => $form_id,
        ]);
        $form_state->setProgrammed();
        $form_state->setSubmitted();
        $form_builder->processForm($form_id, $form, $form_state);
    }

}