FormCacheTest.php

<?php

namespace Drupal\KernelTests\Core\Form;

use Drupal\Core\Form\FormState;
use Drupal\Core\Session\AnonymousUserSession;
use Drupal\Core\Session\UserSession;
use Drupal\Core\Site\Settings;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests FormBuilder caching.
 *
 * @covers \Drupal\Core\Form\FormBuilder::getCache
 * @covers \Drupal\Core\Form\FormBuilder::setCache
 *
 * @group Form
 */
class FormCacheTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'system',
        'user',
    ];
    
    /**
     * @var string
     */
    protected $formBuildId;
    
    /**
     * @var array
     */
    protected $form;
    
    /**
     * @var array
     */
    protected $formState;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->formBuildId = $this->randomMachineName();
        $this->form = [
            '#property' => $this->randomMachineName(),
        ];
        $this->formState = new FormState();
        $this->formState
            ->set('example', $this->randomMachineName());
    }
    
    /**
     * Tests the form cache with a logged-in user.
     */
    public function testCacheToken() {
        \Drupal::currentUser()->setAccount(new UserSession([
            'uid' => 1,
        ]));
        \Drupal::formBuilder()->setCache($this->formBuildId, $this->form, $this->formState);
        $cached_form_state = new FormState();
        $cached_form = \Drupal::formBuilder()->getCache($this->formBuildId, $cached_form_state);
        $this->assertEquals($this->form['#property'], $cached_form['#property']);
        $this->assertNotEmpty($cached_form['#cache_token'], 'Form has a cache token');
        $this->assertEquals($this->formState
            ->get('example'), $cached_form_state->get('example'));
        // Test that the form cache isn't loaded when the session/token has changed.
        // Change the private key. (We cannot change the session ID because this
        // will break the parent site test runner batch.)
        \Drupal::state()->set('system.private_key', 'invalid');
        $cached_form_state = new FormState();
        $cached_form = \Drupal::formBuilder()->getCache($this->formBuildId, $cached_form_state);
        $this->assertNull($cached_form, 'No form returned from cache');
        $cached_form_state_example = $cached_form_state->get('example');
        $this->assertEmpty($cached_form_state_example);
        // Test that loading the cache with a different form_id fails.
        $wrong_form_build_id = $this->randomMachineName(9);
        $cached_form_state = new FormState();
        $this->assertNull(\Drupal::formBuilder()->getCache($wrong_form_build_id, $cached_form_state), 'No form returned from cache');
        $cached_form_state_example = $cached_form_state->get('example');
        $this->assertEmpty($cached_form_state_example, 'Cached form state was not loaded');
    }
    
    /**
     * Tests the form cache without a logged-in user.
     */
    public function testNoCacheToken() {
        // Switch to an anonymous user account.
        $account_switcher = \Drupal::service('account_switcher');
        $account_switcher->switchTo(new AnonymousUserSession());
        $this->formState
            ->set('example', $this->randomMachineName());
        \Drupal::formBuilder()->setCache($this->formBuildId, $this->form, $this->formState);
        $cached_form_state = new FormState();
        $cached_form = \Drupal::formBuilder()->getCache($this->formBuildId, $cached_form_state);
        $this->assertEquals($this->form['#property'], $cached_form['#property']);
        $this->assertArrayNotHasKey('#cache_token', $cached_form, 'Form has no cache token');
        $this->assertEquals($this->formState
            ->get('example'), $cached_form_state->get('example'));
        // Restore user account.
        $account_switcher->switchBack();
    }
    
    /**
     * Tests the form cache with an overridden cache expiration.
     */
    public function testCacheCustomExpiration() {
        // Override form cache expiration so that the cached form expired yesterday.
        new Settings([
            'form_cache_expiration' => -1 * (24 * 60 * 60),
            'hash_salt' => $this->randomMachineName(),
        ]);
        \Drupal::formBuilder()->setCache($this->formBuildId, $this->form, $this->formState);
        $cached_form_state = new FormState();
        $this->assertNull(\Drupal::formBuilder()->getCache($this->formBuildId, $cached_form_state), 'Expired form not returned from cache');
    }

}