class FormTestBase

abstract class FormTestBase extends UnitTestCase {
    
    /**
     * The form builder being tested.
     *
     * @var \Drupal\Core\Form\FormBuilderInterface
     */
    protected $formBuilder;
    
    /**
     * @var \Drupal\Core\Form\FormValidatorInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $formValidator;
    
    /**
     * @var \Drupal\Core\Form\FormSubmitterInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $formSubmitter;
    
    /**
     * The mocked URL generator.
     *
     * @var \Drupal\Core\Routing\UrlGeneratorInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $urlGenerator;
    
    /**
     * The mocked module handler.
     *
     * @var \Drupal\Core\Extension\ModuleHandlerInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $moduleHandler;
    
    /**
     * The form cache.
     *
     * @var \Drupal\Core\Form\FormCacheInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $formCache;
    
    /**
     * The cache backend to use.
     *
     * @var \Drupal\Core\Cache\CacheBackendInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $cache;
    
    /**
     * The current user.
     *
     * @var \Drupal\Core\Session\AccountInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $account;
    
    /**
     * The controller resolver.
     *
     * @var \Drupal\Core\Controller\ControllerResolverInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $controllerResolver;
    
    /**
     * The CSRF token generator.
     *
     * @var \Drupal\Core\Access\CsrfTokenGenerator|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $csrfToken;
    
    /**
     * The request.
     *
     * @var \Symfony\Component\HttpFoundation\Request
     */
    protected $request;
    
    /**
     * The request stack.
     *
     * @var \Symfony\Component\HttpFoundation\RequestStack
     */
    protected $requestStack;
    
    /**
     * The class results.
     *
     * @var \Drupal\Core\DependencyInjection\ClassResolverInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $classResolver;
    
    /**
     * The element info manager.
     *
     * @var \Drupal\Core\Render\ElementInfoManagerInterface
     */
    protected $elementInfo;
    
    /**
     * The event dispatcher.
     *
     * @var \Symfony\Contracts\EventDispatcher\EventDispatcherInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $eventDispatcher;
    
    /**
     * @var \Drupal\Core\StringTranslation\TranslationInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $translationManager;
    
    /**
     * @var \Drupal\Core\DrupalKernelInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $kernel;
    
    /**
     * @var \PHPUnit\Framework\MockObject\MockObject|\Psr\Log\LoggerInterface
     */
    protected $logger;
    
    /**
     * The mocked theme manager.
     *
     * @var \Drupal\Core\Theme\ThemeManagerInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $themeManager;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // Add functions to the global namespace for testing.
        require_once __DIR__ . '/fixtures/form_base_test.inc';
        $this->moduleHandler = $this->createMock('Drupal\\Core\\Extension\\ModuleHandlerInterface');
        $this->formCache = $this->createMock('Drupal\\Core\\Form\\FormCacheInterface');
        $this->cache = $this->createMock('Drupal\\Core\\Cache\\CacheBackendInterface');
        $this->urlGenerator = $this->createMock('Drupal\\Core\\Routing\\UrlGeneratorInterface');
        $this->classResolver = $this->getClassResolverStub();
        $this->elementInfo = $this->getMockBuilder('\\Drupal\\Core\\Render\\ElementInfoManagerInterface')
            ->disableOriginalConstructor()
            ->getMock();
        $this->elementInfo
            ->expects($this->any())
            ->method('getInfo')
            ->willReturnCallback([
            $this,
            'getInfo',
        ]);
        $this->csrfToken = $this->getMockBuilder('Drupal\\Core\\Access\\CsrfTokenGenerator')
            ->disableOriginalConstructor()
            ->getMock();
        $this->kernel = $this->getMockBuilder('\\Drupal\\Core\\DrupalKernel')
            ->disableOriginalConstructor()
            ->getMock();
        $this->account = $this->createMock('Drupal\\Core\\Session\\AccountInterface');
        $this->themeManager = $this->createMock('Drupal\\Core\\Theme\\ThemeManagerInterface');
        $this->request = Request::createFromGlobals();
        $this->eventDispatcher = $this->createMock('Symfony\\Contracts\\EventDispatcher\\EventDispatcherInterface');
        $this->requestStack = new RequestStack();
        $this->requestStack
            ->push($this->request);
        $this->logger = $this->createMock('Drupal\\Core\\Logger\\LoggerChannelInterface');
        $form_error_handler = $this->createMock('Drupal\\Core\\Form\\FormErrorHandlerInterface');
        $this->formValidator = new FormValidator($this->requestStack, $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $form_error_handler);
        $this->formSubmitter = $this->getMockBuilder('Drupal\\Core\\Form\\FormSubmitter')
            ->setConstructorArgs([
            $this->requestStack,
            $this->urlGenerator,
        ])
            ->onlyMethods([
            'batchGet',
        ])
            ->getMock();
        $this->root = dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)), 2);
        $this->formBuilder = new FormBuilder($this->formValidator, $this->formSubmitter, $this->formCache, $this->moduleHandler, $this->eventDispatcher, $this->requestStack, $this->classResolver, $this->elementInfo, $this->themeManager, $this->csrfToken);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function tearDown() {
        Html::resetSeenIds();
        (new FormState())->clearErrors();
    }
    
    /**
     * Provides a mocked form object.
     *
     * @param string $form_id
     *   The form ID to be used.
     * @param mixed $expected_form
     *   (optional) If provided, the expected form response for buildForm() to
     *   return. Defaults to NULL.
     * @param int $count
     *   (optional) The number of times the form is expected to be built. Defaults
     *   to 1.
     *
     * @return \PHPUnit\Framework\MockObject\MockObject|\Drupal\Core\Form\FormInterface
     *   The mocked form object.
     */
    protected function getMockForm($form_id, $expected_form = NULL, $count = 1) {
        $form = $this->createMock('Drupal\\Core\\Form\\FormInterface');
        $form->expects($this->once())
            ->method('getFormId')
            ->willReturn($form_id);
        if ($expected_form) {
            $form->expects($this->exactly($count))
                ->method('buildForm')
                ->willReturn($expected_form);
        }
        return $form;
    }
    
    /**
     * Simulates a form submission within a request, bypassing submitForm().
     *
     * Calling submitForm() will reset the form builder, if two forms were on the
     * same page, they will be submitted simultaneously.
     *
     * @param string $form_id
     *   The unique string identifying the form.
     * @param \Drupal\Core\Form\FormInterface $form_arg
     *   The form object.
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The current state of the form.
     * @param bool $programmed
     *   Whether $form_state->setProgrammed() should be passed TRUE or not. If it
     *   is not set to TRUE, you must provide additional data in $form_state for
     *   the submission to take place.
     *
     * @return array
     *   The built form.
     */
    protected function simulateFormSubmission($form_id, FormInterface $form_arg, FormStateInterface $form_state, $programmed = TRUE) {
        $input = $form_state->getUserInput();
        $input['op'] = 'Submit';
        $form_state->setUserInput($input)
            ->setProgrammed($programmed)
            ->setSubmitted();
        return $this->formBuilder
            ->buildForm($form_arg, $form_state);
    }
    
    /**
     * Asserts that the expected form structure is found in a form for a given key.
     *
     * @param array $expected_form
     *   The expected form structure.
     * @param array $actual_form
     *   The actual form.
     * @param string|null $form_key
     *   (optional) The form key to look in. Otherwise the entire form will be
     *   compared.
     */
    protected function assertFormElement(array $expected_form, array $actual_form, $form_key = NULL) {
        $expected_element = $form_key ? $expected_form[$form_key] : $expected_form;
        $actual_element = $form_key ? $actual_form[$form_key] : $actual_form;
        $this->assertSame(array_intersect_key($expected_element, $actual_element), $expected_element);
    }
    
    /**
     * A stub method returning properties for the defined element type.
     *
     * @param string $type
     *   The machine name of an element type plugin.
     *
     * @return array
     *   An array with dummy values to be used in tests. Defaults to an empty
     *   array.
     */
    public function getInfo($type) {
        $types['hidden'] = [
            '#input' => TRUE,
        ];
        $types['token'] = [
            '#input' => TRUE,
        ];
        $types['value'] = [
            '#input' => TRUE,
        ];
        $types['radios'] = [
            '#input' => TRUE,
        ];
        $types['textfield'] = [
            '#input' => TRUE,
        ];
        $types['submit'] = [
            '#input' => TRUE,
            '#name' => 'op',
            '#is_button' => TRUE,
        ];
        if (!isset($types[$type])) {
            $types[$type] = [];
        }
        return $types[$type];
    }

}