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diff --git a/web/core/modules/layout_builder/tests/src/Unit/SectionRenderTest.php b/web/core/modules/layout_builder/tests/src/Unit/SectionRenderTest.php
new file mode 100644
index 000000000..079a220a4
--- /dev/null
+++ b/web/core/modules/layout_builder/tests/src/Unit/SectionRenderTest.php
@@ -0,0 +1,284 @@
+<?php
+
+namespace Drupal\Tests\layout_builder\Unit;
+
+use Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher;
+use Drupal\Component\Plugin\Exception\PluginException;
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Block\BlockManagerInterface;
+use Drupal\Core\Block\BlockPluginInterface;
+use Drupal\Core\Cache\Cache;
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\Layout\LayoutDefinition;
+use Drupal\Core\Layout\LayoutInterface;
+use Drupal\Core\Layout\LayoutPluginManagerInterface;
+use Drupal\Core\Plugin\Context\ContextHandlerInterface;
+use Drupal\Core\Plugin\Context\ContextRepositoryInterface;
+use Drupal\Core\Plugin\ContextAwarePluginInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\layout_builder\EventSubscriber\BlockComponentRenderArray;
+use Drupal\layout_builder\Section;
+use Drupal\layout_builder\SectionComponent;
+use Drupal\Tests\UnitTestCase;
+use Prophecy\Argument;
+
+/**
+ * @coversDefaultClass \Drupal\layout_builder\Section
+ * @group layout_builder
+ */
+class SectionRenderTest extends UnitTestCase {
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $account;
+
+  /**
+   * The block plugin manager.
+   *
+   * @var \Drupal\Core\Block\BlockManagerInterface
+   */
+  protected $blockManager;
+
+  /**
+   * The plugin context handler.
+   *
+   * @var \Drupal\Core\Plugin\Context\ContextHandlerInterface
+   */
+  protected $contextHandler;
+
+  /**
+   * The context manager service.
+   *
+   * @var \Drupal\Core\Plugin\Context\ContextRepositoryInterface
+   */
+  protected $contextRepository;
+
+  /**
+   * The event dispatcher.
+   *
+   * @var \Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher
+   */
+  protected $eventDispatcher;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    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());
+    $container->set('context.handler', $this->contextHandler->reveal());
+    $container->set('context.repository', $this->contextRepository->reveal());
+    $container->set('event_dispatcher', $this->eventDispatcher);
+    \Drupal::setContainer($container);
+  }
+
+  /**
+   * @covers ::toRenderArray
+   */
+  public function testToRenderArray() {
+    $block_content = ['#markup' => 'The block content.'];
+    $render_array = [
+      '#theme' => 'block',
+      '#weight' => 0,
+      '#configuration' => [],
+      '#plugin_id' => 'block_plugin_id',
+      '#base_plugin_id' => 'block_plugin_id',
+      '#derivative_plugin_id' => NULL,
+      'content' => $block_content,
+      '#cache' => [
+        'contexts' => [],
+        'tags' => [],
+        'max-age' => -1,
+      ],
+    ];
+
+    $block = $this->prophesize(BlockPluginInterface::class);
+    $this->blockManager->createInstance('block_plugin_id', ['id' => 'block_plugin_id'])->willReturn($block->reveal());
+
+    $access_result = AccessResult::allowed();
+    $block->access($this->account->reveal(), TRUE)->willReturn($access_result);
+    $block->build()->willReturn($block_content);
+    $block->getCacheContexts()->willReturn([]);
+    $block->getCacheTags()->willReturn([]);
+    $block->getCacheMaxAge()->willReturn(Cache::PERMANENT);
+    $block->getPluginId()->willReturn('block_plugin_id');
+    $block->getBaseId()->willReturn('block_plugin_id');
+    $block->getDerivativeId()->willReturn(NULL);
+    $block->getConfiguration()->willReturn([]);
+
+    $section = [
+      new SectionComponent('some_uuid', 'content', ['id' => 'block_plugin_id']),
+    ];
+    $expected = [
+      'content' => [
+        'some_uuid' => $render_array,
+      ],
+    ];
+    $result = (new Section('layout_onecol', [], $section))->toRenderArray();
+    $this->assertEquals($expected, $result);
+  }
+
+  /**
+   * @covers ::toRenderArray
+   */
+  public function testToRenderArrayAccessDenied() {
+    $block = $this->prophesize(BlockPluginInterface::class);
+    $this->blockManager->createInstance('block_plugin_id', ['id' => 'block_plugin_id'])->willReturn($block->reveal());
+
+    $access_result = AccessResult::forbidden();
+    $block->access($this->account->reveal(), TRUE)->willReturn($access_result);
+    $block->build()->shouldNotBeCalled();
+    $block->getCacheContexts()->willReturn([]);
+    $block->getCacheTags()->willReturn([]);
+    $block->getCacheMaxAge()->willReturn(Cache::PERMANENT);
+
+    $section = [
+      new SectionComponent('some_uuid', 'content', ['id' => 'block_plugin_id']),
+    ];
+    $expected = [
+      'content' => [
+        'some_uuid' => [
+          '#cache' => [
+            'contexts' => [],
+            'tags' => [],
+            'max-age' => -1,
+          ],
+        ],
+      ],
+    ];
+    $result = (new Section('layout_onecol', [], $section))->toRenderArray();
+    $this->assertEquals($expected, $result);
+  }
+
+  /**
+   * @covers ::toRenderArray
+   */
+  public function testToRenderArrayPreview() {
+    $block_content = ['#markup' => 'The block content.'];
+    $render_array = [
+      '#theme' => 'block',
+      '#weight' => 0,
+      '#configuration' => [],
+      '#plugin_id' => 'block_plugin_id',
+      '#base_plugin_id' => 'block_plugin_id',
+      '#derivative_plugin_id' => NULL,
+      'content' => $block_content,
+      '#cache' => [
+        'contexts' => [],
+        'tags' => [],
+        'max-age' => 0,
+      ],
+    ];
+    $block = $this->prophesize(BlockPluginInterface::class);
+    $this->blockManager->createInstance('block_plugin_id', ['id' => 'block_plugin_id'])->willReturn($block->reveal());
+
+    $block->access($this->account->reveal(), TRUE)->shouldNotBeCalled();
+    $block->build()->willReturn($block_content);
+    $block->getCacheContexts()->willReturn([]);
+    $block->getCacheTags()->willReturn([]);
+    $block->getCacheMaxAge()->willReturn(Cache::PERMANENT);
+    $block->getConfiguration()->willReturn([]);
+    $block->getPluginId()->willReturn('block_plugin_id');
+    $block->getBaseId()->willReturn('block_plugin_id');
+    $block->getDerivativeId()->willReturn(NULL);
+
+    $section = [
+      new SectionComponent('some_uuid', 'content', ['id' => 'block_plugin_id']),
+    ];
+    $expected = [
+      'content' => [
+        'some_uuid' => $render_array,
+      ],
+    ];
+    $result = (new Section('layout_onecol', [], $section))->toRenderArray([], TRUE);
+    $this->assertEquals($expected, $result);
+  }
+
+  /**
+   * @covers ::toRenderArray
+   */
+  public function testToRenderArrayEmpty() {
+    $section = [];
+    $expected = [];
+    $result = (new Section('layout_onecol', [], $section))->toRenderArray();
+    $this->assertEquals($expected, $result);
+  }
+
+  /**
+   * @covers ::toRenderArray
+   */
+  public function testContextAwareBlock() {
+    $render_array = [
+      '#theme' => 'block',
+      '#weight' => 0,
+      '#configuration' => [],
+      '#plugin_id' => 'block_plugin_id',
+      '#base_plugin_id' => 'block_plugin_id',
+      '#derivative_plugin_id' => NULL,
+      'content' => [],
+      '#cache' => [
+        'contexts' => [],
+        'tags' => [],
+        'max-age' => -1,
+      ],
+    ];
+
+    $block = $this->prophesize(BlockPluginInterface::class)->willImplement(ContextAwarePluginInterface::class);
+    $this->blockManager->createInstance('block_plugin_id', ['id' => 'block_plugin_id'])->willReturn($block->reveal());
+
+    $access_result = AccessResult::allowed();
+    $block->access($this->account->reveal(), TRUE)->willReturn($access_result);
+    $block->build()->willReturn([]);
+    $block->getCacheContexts()->willReturn([]);
+    $block->getCacheTags()->willReturn([]);
+    $block->getCacheMaxAge()->willReturn(Cache::PERMANENT);
+    $block->getContextMapping()->willReturn([]);
+    $block->getPluginId()->willReturn('block_plugin_id');
+    $block->getBaseId()->willReturn('block_plugin_id');
+    $block->getDerivativeId()->willReturn(NULL);
+    $block->getConfiguration()->willReturn([]);
+
+    $section = [
+      new SectionComponent('some_uuid', 'content', ['id' => 'block_plugin_id']),
+    ];
+    $expected = [
+      'content' => [
+        'some_uuid' => $render_array,
+      ],
+    ];
+    $result = (new Section('layout_onecol', [], $section))->toRenderArray();
+    $this->assertEquals($expected, $result);
+  }
+
+  /**
+   * @covers ::toRenderArray
+   */
+  public function testToRenderArrayMissingPluginId() {
+    $this->setExpectedException(PluginException::class, 'No plugin ID specified for component with "some_uuid" UUID');
+    (new Section('layout_onecol', [], [new SectionComponent('some_uuid', 'content')]))->toRenderArray();
+  }
+
+}