class ExperimentalHelpTest

class ExperimentalHelpTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * The experimental_module_test module implements hook_help() and is in the
     * Core (Experimental) package.
     *
     * @var array
     */
    protected static $modules = [
        'help',
        'experimental_module_test',
        'help_page_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * The admin user.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->adminUser = $this->drupalCreateUser([
            'access administration pages',
        ]);
    }
    
    /**
     * Verifies that a warning message is displayed for experimental modules.
     */
    public function testExperimentalHelp() {
        $this->drupalLogin($this->adminUser);
        $this->drupalGet('admin/help/experimental_module_test');
        $this->assertSession()
            ->statusMessageContains('This module is experimental.', 'warning');
        // Regular modules should not display the message.
        $this->drupalGet('admin/help/help_page_test');
        $this->assertSession()
            ->statusMessageNotContains('This module is experimental.');
        // Ensure the actual help page is displayed to avoid a false positive.
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->pageTextContains('online documentation for the Help Page Test module');
    }

}