FormDefaultHandlersTest.php

<?php

namespace Drupal\KernelTests\Core\Form;

use Drupal\Core\Form\FormInterface;
use Drupal\Core\Form\FormState;
use Drupal\Core\Form\FormStateInterface;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests automatically added form handlers.
 *
 * @group Form
 */
class FormDefaultHandlersTest extends KernelTestBase implements FormInterface {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'system',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->installSchema('system', [
            'key_value_expire',
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'test_form_handlers';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['#validate'][] = '::customValidateForm';
        $form['#submit'][] = '::customSubmitForm';
        $form['submit'] = [
            '#type' => 'submit',
            '#value' => 'Save',
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function customValidateForm(array &$form, FormStateInterface $form_state) {
        $test_handlers = $form_state->get('test_handlers');
        $test_handlers['validate'][] = __FUNCTION__;
        $form_state->set('test_handlers', $test_handlers);
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
        $test_handlers = $form_state->get('test_handlers');
        $test_handlers['validate'][] = __FUNCTION__;
        $form_state->set('test_handlers', $test_handlers);
    }
    
    /**
     * {@inheritdoc}
     */
    public function customSubmitForm(array &$form, FormStateInterface $form_state) {
        $test_handlers = $form_state->get('test_handlers');
        $test_handlers['submit'][] = __FUNCTION__;
        $form_state->set('test_handlers', $test_handlers);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $test_handlers = $form_state->get('test_handlers');
        $test_handlers['submit'][] = __FUNCTION__;
        $form_state->set('test_handlers', $test_handlers);
    }
    
    /**
     * Tests that default handlers are added even if custom are specified.
     */
    public function testDefaultAndCustomHandlers() {
        $form_state = new FormState();
        $form_builder = $this->container
            ->get('form_builder');
        $form_builder->submitForm($this, $form_state);
        $handlers = $form_state->get('test_handlers');
        $this->assertCount(2, $handlers['validate']);
        $this->assertIdentical($handlers['validate'][0], 'customValidateForm');
        $this->assertIdentical($handlers['validate'][1], 'validateForm');
        $this->assertCount(2, $handlers['submit']);
        $this->assertIdentical($handlers['submit'][0], 'customSubmitForm');
        $this->assertIdentical($handlers['submit'][1], 'submitForm');
    }

}