FormErrorHandlerTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\Core\Form;

use Drupal\Core\Form\FormState;
use Drupal\Core\Messenger\MessengerInterface;
use Drupal\Tests\UnitTestCase;

/**
 * @coversDefaultClass \Drupal\Core\Form\FormErrorHandler
 * @group Form
 */
class FormErrorHandlerTest extends UnitTestCase {
    
    /**
     * The form error handler.
     *
     * @var \Drupal\Core\Form\FormErrorHandler|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $formErrorHandler;
    
    /**
     * The messenger.
     *
     * @var \Drupal\Core\Messenger\MessengerInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $messenger;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->messenger = $this->createMock(MessengerInterface::class);
        $this->formErrorHandler = $this->getMockBuilder('Drupal\\Core\\Form\\FormErrorHandler')
            ->onlyMethods([
            'messenger',
        ])
            ->getMock();
        $this->formErrorHandler
            ->expects($this->atLeastOnce())
            ->method('messenger')
            ->willReturn($this->messenger);
    }
    
    /**
     * @covers ::handleFormErrors
     * @covers ::displayErrorMessages
     */
    public function testDisplayErrorMessages() : void {
        $messages = [
            'invalid',
            'invalid',
            'invalid',
            'no title given',
            'element is invisible',
            'this missing element is invalid',
        ];
        $this->messenger
            ->expects($this->exactly(count($messages)))
            ->method('addMessage')
            ->with($this->callback(function (string $message) use (&$messages) : bool {
            return array_shift($messages) === $message;
        }), 'error');
        $form = [
            '#parents' => [],
            '#array_parents' => [],
        ];
        $form['test1'] = [
            '#type' => 'textfield',
            '#title' => 'Test 1',
            '#parents' => [
                'test1',
            ],
            '#array_parents' => [
                'test1',
            ],
            '#id' => 'edit-test1',
        ];
        $form['test2'] = [
            '#type' => 'textfield',
            '#title' => 'Test 2 & a half',
            '#parents' => [
                'test2',
            ],
            '#array_parents' => [
                'test2',
            ],
            '#id' => 'edit-test2',
        ];
        $form['fieldset'] = [
            '#parents' => [
                'fieldset',
            ],
            '#array_parents' => [
                'fieldset',
            ],
            'test3' => [
                '#type' => 'textfield',
                '#title' => 'Test 3',
                '#parents' => [
                    'fieldset',
                    'test3',
                ],
                '#array_parents' => [
                    'fieldset',
                    'test3',
                ],
                '#id' => 'edit-test3',
            ],
        ];
        $form['test5'] = [
            '#type' => 'textfield',
            '#parents' => [
                'test5',
            ],
            '#array_parents' => [
                'test5',
            ],
            '#id' => 'edit-test5',
        ];
        $form['test6'] = [
            '#type' => 'value',
            '#title' => 'Test 6',
            '#parents' => [
                'test6',
            ],
            '#array_parents' => [
                'test6',
            ],
            '#id' => 'edit-test6',
        ];
        $form_state = new FormState();
        $form_state->setErrorByName('test1', 'invalid');
        $form_state->setErrorByName('test2', 'invalid');
        $form_state->setErrorByName('fieldset][test3', 'invalid');
        $form_state->setErrorByName('test5', 'no title given');
        $form_state->setErrorByName('test6', 'element is invisible');
        $form_state->setErrorByName('missing_element', 'this missing element is invalid');
        $this->formErrorHandler
            ->handleFormErrors($form, $form_state);
        $this->assertSame('invalid', $form['test1']['#errors']);
    }
    
    /**
     * @covers ::handleFormErrors
     * @covers ::setElementErrorsFromFormState
     */
    public function testSetElementErrorsFromFormState() : void {
        $form = [
            '#parents' => [],
            '#array_parents' => [],
        ];
        $form['test'] = [
            '#type' => 'textfield',
            '#title' => 'Test',
            '#parents' => [
                'test',
            ],
            '#array_parents' => [
                'test',
            ],
            '#id' => 'edit-test',
        ];
        $form['details'] = [
            '#type' => 'details',
            '#title' => 'Details grouping test',
            '#parents' => [
                'details',
            ],
            '#array_parents' => [
                'details',
            ],
            '#id' => 'edit-details',
        ];
        $form['grouping_test'] = [
            '#type' => 'textfield',
            '#title' => 'Grouping test',
            '#parents' => [
                'grouping_test',
            ],
            '#array_parents' => [
                'grouping_test',
            ],
            '#id' => 'edit-grouping-test',
            '#group' => 'details',
        ];
        $form['grouping_test2'] = [
            '#type' => 'textfield',
            '#title' => 'Grouping test 2',
            '#parents' => [
                'grouping_test2',
            ],
            '#array_parents' => [
                'grouping_test2',
            ],
            '#id' => 'edit-grouping-test2',
            '#group' => 'details',
        ];
        $form['details2'] = [
            '#type' => 'details',
            '#title' => 'Details grouping test 2',
            '#parents' => [
                'details2',
            ],
            '#array_parents' => [
                'details2',
            ],
            '#id' => 'edit-details2',
        ];
        $form['grouping_test3'] = [
            '#type' => 'textfield',
            '#title' => 'Grouping test 3',
            '#parents' => [
                'grouping_test3',
            ],
            '#array_parents' => [
                'grouping_test3',
            ],
            '#id' => 'edit-grouping-test3',
            '#group' => 'details2',
        ];
        $form['fieldset'] = [
            '#type' => 'fieldset',
            '#parents' => [
                'fieldset',
            ],
            '#array_parents' => [
                'fieldset',
            ],
            '#id' => 'edit-fieldset',
            'nested_test' => [
                '#type' => 'textfield',
                '#title' => 'Nested test',
                '#parents' => [
                    'fieldset',
                    'nested_test',
                ],
                '#array_parents' => [
                    'fieldset',
                    'nested_test',
                ],
                '#id' => 'edit-nested_test',
            ],
            'nested_test2' => [
                '#type' => 'textfield',
                '#title' => 'Nested test2',
                '#parents' => [
                    'fieldset',
                    'nested_test2',
                ],
                '#array_parents' => [
                    'fieldset',
                    'nested_test2',
                ],
                '#id' => 'edit-nested_test2',
            ],
        ];
        $form_state = new FormState();
        $form_state->setErrorByName('test', 'invalid');
        $form_state->setErrorByName('grouping_test', 'invalid');
        $form_state->setErrorByName('grouping_test2', 'invalid');
        $form_state->setErrorByName('fieldset][nested_test', 'invalid');
        $form_state->setErrorByName('fieldset][nested_test2', 'invalid2');
        $this->formErrorHandler
            ->handleFormErrors($form, $form_state);
        $this->assertSame('invalid', $form['test']['#errors']);
        $this->assertSame([
            'grouping_test' => 'invalid',
            'grouping_test2' => 'invalid',
        ], $form['details']['#children_errors']);
        $this->assertSame([
            'fieldset][nested_test' => 'invalid',
            'fieldset][nested_test2' => 'invalid2',
        ], $form['fieldset']['#children_errors']);
        $this->assertEmpty($form['details2']['#children_errors'], 'Children errors are empty for grouping element.');
        $this->assertCount(5, $form['#children_errors']);
    }

}