class NoHelpTest

class NoHelpTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * Use one of the test modules that do not implement hook_help().
     *
     * @var array
     */
    protected static $modules = [
        'help',
        'menu_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * The user who will be created.
     */
    protected $adminUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->adminUser = $this->drupalCreateUser([
            'access administration pages',
        ]);
    }
    
    /**
     * Ensures modules not implementing help do not appear on admin/help.
     */
    public function testMainPageNoHelp() {
        $this->drupalLogin($this->adminUser);
        $this->drupalGet('admin/help');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->pageTextContains('Module overviews are provided by modules');
        $this->assertFalse(\Drupal::moduleHandler()->hasImplementations('help', 'menu_test'), 'The menu_test module does not implement hook_help');
        // Make sure the test module menu_test does not display a help link on
        // admin/help.
        $this->assertSession()
            ->pageTextNotContains(\Drupal::moduleHandler()->getName('menu_test'));
        // Ensure that the module overview help page for a module that does not
        // implement hook_help() results in a 404.
        $this->drupalGet('admin/help/menu_test');
        $this->assertSession()
            ->statusCodeEquals(404);
    }

}