AjaxRenderer example

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() {
    $main_content = ['#markup' => 'example content'];
    $request = new Request();
    $route_match = $this->createMock('Drupal\Core\Routing\RouteMatchInterface');