class AjaxRendererTest

class AjaxRendererTest extends UnitTestCase {
    
    /**
     * The tested ajax controller.
     *
     * @var \Drupal\Core\Render\MainContent\AjaxRenderer
     */
    protected $ajaxRenderer;
    
    /**
     * The renderer.
     *
     * @var \Drupal\Core\Render\RendererInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $renderer;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $element_info_manager = $this->createMock('Drupal\\Core\\Render\\ElementInfoManagerInterface');
        $element_info_manager->expects($this->any())
            ->method('getInfo')
            ->with('ajax')
            ->willReturn([
            '#header' => TRUE,
            '#commands' => [],
            '#error' => NULL,
        ]);
        $renderer = $this->createMock(RendererInterface::class);
        $renderer->expects($this->any())
            ->method('renderRoot')
            ->willReturnCallback(function (&$elements, $is_root_call = FALSE) {
            $elements += [
                '#attached' => [],
            ];
            if (isset($elements['#markup'])) {
                return $elements['#markup'];
            }
            elseif (isset($elements['#type'])) {
                return $elements['#type'];
            }
            else {
                return 'Markup';
            }
        });
        $this->ajaxRenderer = new AjaxRenderer($element_info_manager, $renderer);
    }
    
    /**
     * Tests the content method.
     *
     * @covers ::renderResponse
     */
    public function testRenderWithFragmentObject() : void {
        $main_content = [
            '#markup' => 'example content',
        ];
        $request = new Request();
        $route_match = $this->createMock('Drupal\\Core\\Routing\\RouteMatchInterface');
        
        /** @var \Drupal\Core\Ajax\AjaxResponse $result */
        $result = $this->ajaxRenderer
            ->renderResponse($main_content, $request, $route_match);
        $this->assertInstanceOf('Drupal\\Core\\Ajax\\AjaxResponse', $result);
        $commands = $result->getCommands();
        $this->assertEquals('insert', $commands[0]['command']);
        $this->assertEquals('example content', $commands[0]['data']);
        $this->assertEquals('insert', $commands[1]['command']);
        $this->assertEquals('status_messages', $commands[1]['data']);
    }

}