class HelpTopicTwigTest

class HelpTopicTwigTest extends UnitTestCase {
    
    /**
     * The help topic instance to test.
     *
     * @var \Drupal\help\HelpTopicTwig
     */
    protected $helpTopic;
    
    /**
     * The plugin information to use for setting up a test topic.
     *
     * @var array
     */
    const PLUGIN_INFORMATION = [
        'id' => 'test.topic',
        'provider' => 'test',
        'label' => 'This is the topic label',
        'top_level' => TRUE,
        'related' => [
            'something',
        ],
        'body' => '<p>This is the topic body</p>',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->helpTopic = new HelpTopicTwig([], self::PLUGIN_INFORMATION['id'], self::PLUGIN_INFORMATION, $this->getTwigMock());
    }
    
    /**
     * @covers ::getBody
     * @covers ::getLabel
     */
    public function testText() : void {
        $this->assertEquals($this->helpTopic
            ->getBody(), [
            '#markup' => self::PLUGIN_INFORMATION['body'],
        ]);
        $this->assertEquals($this->helpTopic
            ->getLabel(), self::PLUGIN_INFORMATION['label']);
    }
    
    /**
     * @covers ::getProvider
     * @covers ::isTopLevel
     * @covers ::getRelated
     */
    public function testDefinition() : void {
        $this->assertEquals($this->helpTopic
            ->getProvider(), self::PLUGIN_INFORMATION['provider']);
        $this->assertEquals($this->helpTopic
            ->isTopLevel(), self::PLUGIN_INFORMATION['top_level']);
        $this->assertEquals($this->helpTopic
            ->getRelated(), self::PLUGIN_INFORMATION['related']);
    }
    
    /**
     * @covers ::getCacheContexts
     * @covers ::getCacheTags
     * @covers ::getCacheMaxAge
     */
    public function testCacheInfo() : void {
        $this->assertEquals([], $this->helpTopic
            ->getCacheContexts());
        $this->assertEquals([
            'core.extension',
        ], $this->helpTopic
            ->getCacheTags());
        $this->assertEquals(Cache::PERMANENT, $this->helpTopic
            ->getCacheMaxAge());
    }
    
    /**
     * Creates a mock Twig loader class for the test.
     */
    protected function getTwigMock() {
        $twig = $this->getMockBuilder('Drupal\\Core\\Template\\TwigEnvironment')
            ->disableOriginalConstructor()
            ->getMock();
        $template = $this->getMockForAbstractClass(Template::class, [
            $twig,
        ], '', TRUE, TRUE, TRUE, [
            'render',
        ]);
        $template->method('render')
            ->willReturn(self::PLUGIN_INFORMATION['body']);
        $twig->method('load')
            ->willReturn(new TemplateWrapper($twig, $template));
        return $twig;
    }

}