class UITestBase

abstract class UITestBase extends ViewTestBase {
    
    /**
     * An admin user with the 'administer views' permission.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * An admin user with administrative permissions for views, blocks, and nodes.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $fullAdminUser;
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'node',
        'views_ui',
        'block',
        'taxonomy',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp($import_test_views = TRUE, $modules = [
        'views_test_config',
    ]) {
        parent::setUp($import_test_views, $modules);
        $this->enableViewsTestModule();
        $this->adminUser = $this->drupalCreateUser([
            'administer views',
        ]);
        $this->fullAdminUser = $this->drupalCreateUser([
            'administer views',
            'administer blocks',
            'bypass node access',
            'access user profiles',
            'view all revisions',
            'administer permissions',
        ]);
        $this->drupalLogin($this->fullAdminUser);
    }
    
    /**
     * A helper method which creates a random view.
     */
    public function randomView(array $view = []) {
        // Create a new view in the UI.
        $default = [];
        $default['label'] = $this->randomMachineName(16);
        $default['id'] = strtolower($this->randomMachineName(16));
        $default['description'] = $this->randomMachineName(16);
        $default['page[create]'] = TRUE;
        $default['page[path]'] = $default['id'];
        $view += $default;
        $this->drupalGet('admin/structure/views/add');
        $this->submitForm($view, 'Save and edit');
        return $default;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function drupalGet($path, array $options = [], array $headers = []) {
        $url = $this->buildUrl($path, $options);
        // Ensure that each nojs page is accessible via ajax as well.
        if (strpos($url, '/nojs/') !== FALSE) {
            $url = preg_replace('|/nojs/|', '/ajax/', $url, 1);
            $result = $this->drupalGet($url, $options);
            $this->assertSession()
                ->statusCodeEquals(200);
            $this->assertSession()
                ->responseHeaderEquals('Content-Type', 'application/json');
            $this->assertNotEmpty(json_decode($result), 'Ensure that the AJAX request returned valid content.');
        }
        return parent::drupalGet($path, $options, $headers);
    }

}