BlockComponentRenderArray example

$block_content = [
      '#markup' => 'The block content.',
      '#cache' => ['tags' => ['build-tag']],
    ];
    $block->build()->willReturn($block_content);
    $this->blockManager->createInstance('some_block_id', ['id' => 'some_block_id'])->willReturn($block->reveal());

    $component = new SectionComponent('some-uuid', 'some-region', ['id' => 'some_block_id']);
    $in_preview = FALSE;
    $event = new SectionComponentBuildRenderArrayEvent($component, $contexts, $in_preview);

    $subscriber = new BlockComponentRenderArray($this->account->reveal());

    $expected_build = [
      '#theme' => 'block',
      '#weight' => 0,
      '#configuration' => [],
      '#plugin_id' => 'block_plugin_id',
      '#base_plugin_id' => 'block_plugin_id',
      '#derivative_plugin_id' => NULL,
      'content' => $block_content,
      '#in_preview' => FALSE,
    ];

    

protected function setUp(): void {
    parent::setUp();

    $layout_plugin_manager = $this->prophesize(LayoutPluginManagerInterface::class);
    $this->blockManager = $this->prophesize(BlockManagerInterface::class);
    $this->contextHandler = $this->prophesize(ContextHandlerInterface::class);
    $this->contextRepository = $this->prophesize(ContextRepositoryInterface::class);
    // @todo Refactor this into some better tests in https://www.drupal.org/node/2942605.     $this->eventDispatcher = (new \ReflectionClass(ContainerAwareEventDispatcher::class))->newInstanceWithoutConstructor();

    $this->account = $this->prophesize(AccountInterface::class);
    $subscriber = new BlockComponentRenderArray($this->account->reveal());
    $this->eventDispatcher->addSubscriber($subscriber);

    $layout = $this->prophesize(LayoutInterface::class);
    $layout->getPluginDefinition()->willReturn(new LayoutDefinition([]));
    $layout->build(Argument::type('array'))->willReturnArgument(0);
    $layout_plugin_manager->createInstance('layout_onecol', [])->willReturn($layout->reveal());

    $container = new ContainerBuilder();
    $container->set('current_user', $this->account->reveal());
    $container->set('plugin.manager.block', $this->blockManager->reveal());
    $container->set('plugin.manager.core.layout', $layout_plugin_manager->reveal());