--- /dev/null
+<?php
+
+namespace Drupal\Tests\block_content\Kernel;
+
+use Drupal\block_content\Entity\BlockContent;
+use Drupal\block_content\Entity\BlockContentType;
+use Drupal\Component\Plugin\PluginBase;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests block content plugin deriver.
+ *
+ * @group block_content
+ */
+class BlockContentDeriverTest extends KernelTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['block', 'block_content', 'system', 'user'];
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setUp() {
+ parent::setUp();
+ $this->installSchema('system', ['sequence']);
+ $this->installEntitySchema('user');
+ $this->installEntitySchema('block_content');
+ }
+
+ /**
+ * Tests that only reusable blocks are derived.
+ */
+ public function testReusableBlocksOnlyAreDerived() {
+ // Create a block content type.
+ $block_content_type = BlockContentType::create([
+ 'id' => 'spiffy',
+ 'label' => 'Mucho spiffy',
+ 'description' => "Provides a block type that increases your site's spiffiness by up to 11%",
+ ]);
+ $block_content_type->save();
+ // And a block content entity.
+ $block_content = BlockContent::create([
+ 'info' => 'Spiffy prototype',
+ 'type' => 'spiffy',
+ ]);
+ $block_content->save();
+
+ // Ensure the reusable block content is provided as a derivative block
+ // plugin.
+ /** @var \Drupal\Core\Block\BlockManagerInterface $block_manager */
+ $block_manager = $this->container->get('plugin.manager.block');
+ $plugin_id = 'block_content' . PluginBase::DERIVATIVE_SEPARATOR . $block_content->uuid();
+ $this->assertTrue($block_manager->hasDefinition($plugin_id));
+
+ // Set the block not to be reusable.
+ $block_content->setNonReusable();
+ $block_content->save();
+
+ // Ensure the non-reusable block content is not provided a derivative block
+ // plugin.
+ $this->assertFalse($block_manager->hasDefinition($plugin_id));
+ }
+
+}