class HelpBlockTest

class HelpBlockTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'help',
        'help_page_test',
        'block',
        'more_help_page_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * The help block instance.
     *
     * @var \Drupal\block\Entity\Block
     */
    protected $helpBlock;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->helpBlock = $this->placeBlock('help_block');
    }
    
    /**
     * Logs in users, tests help pages.
     */
    public function testHelp() {
        $this->drupalGet('help_page_test/has_help');
        $this->assertSession()
            ->pageTextContains('I have help!');
        $this->assertSession()
            ->pageTextContains($this->helpBlock
            ->label());
        $this->drupalGet('help_page_test/no_help');
        // The help block should not appear when there is no help.
        $this->assertSession()
            ->pageTextNotContains($this->helpBlock
            ->label());
        // Ensure that if two hook_help() implementations both return a render array
        // the output is as expected.
        $this->drupalGet('help_page_test/test_array');
        $this->assertSession()
            ->pageTextContains('Help text from more_help_page_test_help module.');
        $this->assertSession()
            ->pageTextContains('Help text from help_page_test_help module.');
    }

}