class HelpTest

class HelpTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * The help_test module implements hook_help() but does not provide a module
     * overview page. The help_page_test module has a page section plugin that
     * returns no links.
     *
     * @var array
     */
    public static $modules = [
        'help_test',
        'help_page_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Use the Standard profile to test help implementations of many core modules.
     *
     * @var string
     */
    protected $profile = 'standard';
    
    /**
     * The admin user that will be created.
     */
    protected $adminUser;
    
    /**
     * The anonymous user that will be created.
     */
    protected $anyUser;
    protected function setUp() {
        parent::setUp();
        // Create users.
        $this->adminUser = $this->drupalCreateUser([
            'access administration pages',
            'view the administration theme',
            'administer permissions',
        ]);
        $this->anyUser = $this->drupalCreateUser([]);
    }
    
    /**
     * Logs in users, tests help pages.
     */
    public function testHelp() {
        // Log in the root user to ensure as many admin links appear as possible on
        // the module overview pages.
        $this->drupalLogin($this->rootUser);
        $this->verifyHelp();
        // Log in the regular user.
        $this->drupalLogin($this->anyUser);
        $this->verifyHelp(403);
        // Verify that introductory help text exists, goes for 100% module coverage.
        $this->drupalLogin($this->adminUser);
        $this->drupalGet('admin/help');
        $this->assertRaw(t('For more information, refer to the help listed on this page or to the <a href=":docs">online documentation</a> and <a href=":support">support</a> pages at <a href=":drupal">drupal.org</a>.', [
            ':docs' => 'https://www.drupal.org/documentation',
            ':support' => 'https://www.drupal.org/support',
            ':drupal' => 'https://www.drupal.org',
        ]));
        // Verify that hook_help() section title and description appear.
        $this->assertRaw('<h2>' . t('Module overviews') . '</h2>');
        $this->assertRaw('<p>' . t('Module overviews are provided by modules. Overviews available for your installed modules:'), '</p>');
        // Verify that an empty section is handled correctly.
        $this->assertRaw('<h2>' . t('Empty section') . '</h2>');
        $this->assertRaw('<p>' . t('This description should appear.'), '</p>');
        $this->assertText(t('There is currently nothing in this section.'));
        // Make sure links are properly added for modules implementing hook_help().
        foreach ($this->getModuleList() as $module => $name) {
            $this->assertSession()
                ->linkExists($name, 0, new FormattableMarkup('Link properly added to @name (admin/help/@module)', [
                '@module' => $module,
                '@name' => $name,
            ]));
        }
        // Ensure that module which does not provide an module overview page is
        // handled correctly.
        $this->clickLink(\Drupal::moduleHandler()->getName('help_test'));
        $this->assertRaw(t('No help is available for module %module.', [
            '%module' => \Drupal::moduleHandler()->getName('help_test'),
        ]));
        // Verify that the order of topics is alphabetical by displayed module
        // name, by checking the order of some modules, including some that would
        // have a different order if it was done by machine name instead.
        $this->drupalGet('admin/help');
        $page_text = $this->getTextContent();
        $start = strpos($page_text, 'Module overviews');
        $pos = $start;
        $list = [
            'Block',
            'Color',
            'Custom Block',
            'History',
            'Text Editor',
        ];
        foreach ($list as $name) {
            $this->assertSession()
                ->linkExists($name);
            $new_pos = strpos($page_text, $name, $start);
            $this->assertTrue($new_pos > $pos, 'Order of ' . $name . ' is correct on page');
            $pos = $new_pos;
        }
    }
    
    /**
     * Verifies the logged in user has access to the various help pages.
     *
     * @param int $response
     *   (optional) An HTTP response code. Defaults to 200.
     */
    protected function verifyHelp($response = 200) {
        $this->drupalGet('admin/index');
        $this->assertSession()
            ->statusCodeEquals($response);
        if ($response == 200) {
            $this->assertText('This page shows you all available administration tasks for each module.');
        }
        else {
            $this->assertNoText('This page shows you all available administration tasks for each module.');
        }
        foreach ($this->getModuleList() as $module => $name) {
            // View module help page.
            $this->drupalGet('admin/help/' . $module);
            $this->assertSession()
                ->statusCodeEquals($response);
            if ($response == 200) {
                $this->assertTitle("{$name} | Drupal");
                $this->assertEquals($name, $this->cssSelect('h1.page-title')[0]
                    ->getText(), "{$module} heading was displayed");
                $info = \Drupal::service('extension.list.module')->getExtensionInfo($module);
                $admin_tasks = system_get_module_admin_tasks($module, $info);
                if (!empty($admin_tasks)) {
                    $this->assertText(t('@module administration pages', [
                        '@module' => $name,
                    ]));
                }
                foreach ($admin_tasks as $task) {
                    $this->assertSession()
                        ->linkExists($task['title']);
                    // Ensure there are no double escaped '&' or '<' characters.
                    $this->assertNoEscaped('&amp;');
                    $this->assertNoEscaped('&lt;');
                    // Ensure there are no escaped '<' characters.
                    $this->assertNoEscaped('<');
                }
                // Ensure there are no double escaped '&' or '<' characters.
                $this->assertNoEscaped('&amp;');
                $this->assertNoEscaped('&lt;');
                // Ensure there are no escaped '<' characters.
                $this->assertNoEscaped('<');
            }
        }
    }
    
    /**
     * Gets the list of enabled modules that implement hook_help().
     *
     * @return array
     *   A list of enabled modules.
     */
    protected function getModuleList() {
        $modules = [];
        $module_data = $this->container
            ->get('extension.list.module')
            ->getList();
        foreach (\Drupal::moduleHandler()->getImplementations('help') as $module) {
            $modules[$module] = $module_data[$module]->info['name'];
        }
        return $modules;
    }

}