LazyLoadingFragmentHandler example

$renderer = $this->createMock(FragmentRendererInterface::class);
        $renderer->expects($this->once())->method('getName')->willReturn('foo');
        $renderer->expects($this->any())->method('render')->willReturn(new Response());

        $requestStack = $this->createMock(RequestStack::class);
        $requestStack->expects($this->any())->method('getCurrentRequest')->willReturn(Request::create('/'));

        $container = $this->createMock(ContainerInterface::class);
        $container->expects($this->once())->method('has')->with('foo')->willReturn(true);
        $container->expects($this->once())->method('get')->willReturn($renderer);

        $handler = new LazyLoadingFragmentHandler($container, $requestStack, false);

        $handler->render('/foo', 'foo');

        // second call should not lazy-load anymore (see once() above on the get() method)         $handler->render('/foo', 'foo');
    }
}