Update to Drupal 8.0.0 beta 14. For more information, see https://drupal.org/node/2544542

core/modules/block_content/src/BlockContentForm.php

@@ -224,7 +224,8 @@ class BlockContentForm extends ContentEntityForm {
    * {@inheritdoc}
    */
   public function validateForm(array &$form, FormStateInterface $form_state) {
-    if ($this->entity->isNew()) {
+    $entity = parent::validateForm($form, $form_state);
+    if ($entity->isNew()) {
       $exists = $this->blockContentStorage->loadByProperties(array('info' => $form_state->getValue(['info', 0, 'value'])));
       if (!empty($exists)) {
         $form_state->setErrorByName('info', $this->t('A block with description %name already exists.', array(
@@ -232,6 +233,7 @@ class BlockContentForm extends ContentEntityForm {
         )));
       }
     }
+    return $entity;
   }
 
 }

core/modules/block_content/src/BlockContentTypeListBuilder.php

@@ -7,7 +7,6 @@
 
 namespace Drupal\block_content;
 
-use Drupal\Component\Utility\Xss;
 use Drupal\Core\Config\Entity\ConfigEntityListBuilder;
 use Drupal\Core\Entity\EntityInterface;
 
@@ -45,7 +44,7 @@ class BlockContentTypeListBuilder extends ConfigEntityListBuilder {
    */
   public function buildRow(EntityInterface $entity) {
     $row['type'] = $entity->link();
-    $row['description'] = Xss::filterAdmin($entity->getDescription());
+    $row['description']['data']['#markup'] = $entity->getDescription();
     return $row + parent::buildRow($entity);
   }
 

core/modules/block_content/src/Plugin/migrate/source/d6/Box.php

@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\block_content\Plugin\migrate\source\d6\Box.
+ */
+
+namespace Drupal\block_content\Plugin\migrate\source\d6;
+
+use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
+
+/**
+ * Drupal 6 block source from database.
+ *
+ * @MigrateSource(
+ *   id = "d6_box"
+ * )
+ */
+class Box extends DrupalSqlBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+    $query = $this->select('boxes', 'b')
+      ->fields('b', array('bid', 'body', 'info', 'format'));
+    $query->orderBy('bid');
+
+    return $query;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    return array(
+      'bid' => $this->t('The numeric identifier of the block/box'),
+      'body' => $this->t('The block/box content'),
+      'info' => $this->t('Admin title of the block/box.'),
+      'format' => $this->t('Input format of the custom block/box content.'),
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    $ids['bid']['type'] = 'integer';
+    return $ids;
+  }
+
+}

core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php

@@ -90,13 +90,15 @@ class BlockContentCacheTagsTest extends EntityCacheTagsTestBase {
     // Expected keys, contexts, and tags for the block.
     // @see \Drupal\block\BlockViewBuilder::viewMultiple()
     $expected_block_cache_keys = ['entity_view', 'block', $block->id()];
-    $expected_block_cache_contexts = ['languages:' . LanguageInterface::TYPE_INTERFACE, 'theme'];
-    $expected_block_cache_tags = Cache::mergeTags(['block_view', 'rendered'], $block->getCacheTags(), $block->getPlugin()->getCacheTags());
+    $expected_block_cache_contexts = ['languages:' . LanguageInterface::TYPE_INTERFACE, 'theme', 'user.permissions'];
+    $expected_block_cache_tags = Cache::mergeTags(['block_view', 'rendered'], $block->getCacheTags());
+    $expected_block_cache_tags = Cache::mergeTags($expected_block_cache_tags, $block->getPlugin()->getCacheTags());
 
     // Expected contexts and tags for the BlockContent entity.
     // @see \Drupal\Core\Entity\EntityViewBuilder::getBuildDefaults().
     $expected_entity_cache_contexts = ['theme'];
-    $expected_entity_cache_tags = Cache::mergeTags(['block_content_view'], $this->entity->getCacheTags(), $this->getAdditionalCacheTagsForEntity($this->entity));
+    $expected_entity_cache_tags = Cache::mergeTags(['block_content_view'], $this->entity->getCacheTags());
+    $expected_entity_cache_tags = Cache::mergeTags($expected_entity_cache_tags, $this->getAdditionalCacheTagsForEntity($this->entity));
 
     // Verify that what was render cached matches the above expectations.
     $cid = $this->createCacheId($expected_block_cache_keys, $expected_block_cache_contexts);

core/modules/block_content/src/Tests/BlockContentTypeTest.php

@@ -189,6 +189,7 @@ class BlockContentTypeTest extends BlockContentTestBase {
         // block configure form.
         $path = $theme == $default_theme ? 'admin/structure/block' : "admin/structure/block/list/$theme";
         $this->drupalGet($path);
+        $this->clickLinkPartialName('Place block');
         $this->clickLink(t('Add custom block'));
         // The seven theme has markup inside the link, we cannot use clickLink().
         if ($default_theme == 'seven') {

core/modules/block_content/src/Tests/Migrate/d6/MigrateBlockContentTest.php

@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\block_content\Tests\Migrate\d6\MigrateBlockContentTest.
+ */
+
+namespace Drupal\block_content\Tests\Migrate\d6;
+
+use Drupal\block_content\Entity\BlockContent;
+use Drupal\migrate_drupal\Tests\d6\MigrateDrupal6TestBase;
+
+/**
+ * Upgrade custom blocks.
+ *
+ * @group block_content
+ */
+class MigrateBlockContentTest extends MigrateDrupal6TestBase {
+
+  static $modules = array('block', 'block_content', 'filter', 'text');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->installConfig(array('block_content'));
+    $this->installEntitySchema('block_content');
+
+    $this->executeMigration('d6_block_content_type');
+    $this->executeMigration('d6_block_content_body_field');
+
+    $this->prepareMigrations(array(
+      'd6_filter_format' => array(
+        array(array(2), array('full_html'))
+      )
+    ));
+    $this->loadDumps(['Boxes.php']);
+    $this->executeMigration('d6_custom_block');
+  }
+
+  /**
+   * Tests the Drupal 6 custom block to Drupal 8 migration.
+   */
+  public function testBlockMigration() {
+    /** @var BlockContent $block */
+    $block = BlockContent::load(1);
+    $this->assertIdentical('My block 1', $block->label());
+    $this->assertTrue(REQUEST_TIME <= $block->getChangedTime() && $block->getChangedTime() <= time());
+    $this->assertIdentical('en', $block->language()->getId());
+    $this->assertIdentical('<h3>My first custom block body</h3>', $block->body->value);
+    $this->assertIdentical('full_html', $block->body->format);
+
+    $block = BlockContent::load(2);
+    $this->assertIdentical('My block 2', $block->label());
+    $this->assertTrue(REQUEST_TIME <= $block->getChangedTime() && $block->getChangedTime() <= time());
+    $this->assertIdentical('en', $block->language()->getId());
+    $this->assertIdentical('<h3>My second custom block body</h3>', $block->body->value);
+    $this->assertIdentical('full_html', $block->body->format);
+  }
+
+}