diff --git a/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentJsonAnonTest.php b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentJsonAnonTest.php
new file mode 100644
index 0000000..16688cb
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentJsonAnonTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\BlockContent;
+
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+
+/**
+ * @group rest
+ */
+class BlockContentJsonAnonTest extends BlockContentResourceTestBase {
+
+  use AnonResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentJsonCookieTest.php b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentJsonCookieTest.php
new file mode 100644
index 0000000..b53efc7
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentJsonCookieTest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\BlockContent;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * @group rest
+ */
+class BlockContentJsonCookieTest extends BlockContentResourceTestBase {
+
+  use CookieResourceTestTrait {
+    assertResponseWhenMissingAuthentication as traitassertResponseWhenMissingAuthentication;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function assertResponseWhenMissingAuthentication(ResponseInterface $response) {
+    // BlockContent entities are accessible even when not authenticated.
+    // As a result this is a 200 instead of 403.
+    // @todo https://www.drupal.org/node/2851905
+    $this->assertResourceErrorResponse(200, FALSE, $response);
+  }
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php
new file mode 100644
index 0000000..f5d8889
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php
@@ -0,0 +1,147 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\BlockContent;
+
+use Drupal\block_content\Entity\BlockContent;
+use Drupal\block_content\Entity\BlockContentType;
+use Drupal\Tests\rest\Functional\EntityResource\EntityResourceTestBase;
+
+/**
+ * ResourceTestBase for BlockContent entity.
+ */
+abstract class BlockContentResourceTestBase extends EntityResourceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['block_content'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $entityTypeId = 'block_content';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $patchProtectedFieldNames = [
+    'id',
+    'revision_id',
+    'changed'
+  ];
+
+  /**
+   * @var \Drupal\block_content\BlockContentInterface
+   */
+  protected $entity;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthorization($method) {
+    $this->grantPermissionsToTestedRole(['administer blocks']);
+  }
+
+  /**
+   * @return mixed
+   */
+  protected function createEntity() {
+    $block_content_type = BlockContentType::create(array(
+      'id' => 'basic',
+      'label' => 'basic',
+      'revision' => FALSE
+    ));
+    $block_content_type->save();
+    block_content_add_body_field($block_content_type->id());
+
+    // Create a "Llama" custom block.
+    $block_content = BlockContent::create(array(
+      'info' => 'Llama',
+      'type' => 'basic',
+      'body' => array(
+        'value' => 'The name "llama" was adopted by European settlers from native Peruvians.',
+        'format' => 'plain_text',
+      ),
+    ));
+    $block_content->setChangedTime(123456789)
+      ->setRevisionCreationTime(123456789)
+      ->save();
+
+    return $block_content;
+  }
+
+  /**
+   * @return mixed
+   */
+  protected function getExpectedNormalizedEntity() {
+    return [
+      'id' => [
+        [
+          'value' => '1'
+        ],
+      ],
+      'uuid' => [
+        [
+          'value' => $this->entity->uuid()
+        ],
+      ],
+      'langcode' => [
+        [
+          'value' => 'en',
+        ],
+      ],
+      'type' => [
+        [
+          'target_id' => 'basic',
+          'target_type' => 'block_content_type',
+          'target_uuid' => BlockContentType::load('basic')->uuid()
+        ],
+      ],
+      'info' => [
+        [
+          'value' => 'Llama'
+        ],
+      ],
+      'revision_log' => [
+
+      ],
+      'changed' => [
+        [
+          'value' => '123456789'
+        ],
+      ],
+      'revision_created' => [
+        [
+          'value' => '123456789'
+        ],
+      ],
+      'revision_user' => [
+
+      ],
+      'revision_translation_affected' => [
+        [
+          'value' => 1
+        ],
+      ],
+      'default_langcode' => [
+        [
+          'value' => TRUE,
+        ],
+      ],
+      'body' => [
+        [
+          'value' => 'The name "llama" was adopted by European settlers from native Peruvians.',
+          'format' => 'plain_text',
+        ]
+      ]
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getNormalizedPostEntity() {
+    return [];
+  }
+
+}