--- /dev/null
+<?php
+
+namespace Drupal\Tests\book\Kernel\Migrate\d7;
+
+use Drupal\Tests\migrate_drupal\Kernel\d7\MigrateDrupal7TestBase;
+use Drupal\node\Entity\Node;
+
+/**
+ * Tests migration of book structures from Drupal 7.
+ *
+ * @group migrate_drupal_7
+ */
+class MigrateBookTest extends MigrateDrupal7TestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = [
+ 'book',
+ 'menu_ui',
+ 'node',
+ 'taxonomy',
+ 'text',
+ ];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ $this->installEntitySchema('node');
+ $this->installEntitySchema('taxonomy_term');
+ $this->installConfig(['node']);
+ $this->installSchema('book', ['book']);
+ $this->installSchema('node', ['node_access']);
+ $this->executeMigrations([
+ 'd7_user_role',
+ 'd7_user',
+ 'd7_node_type',
+ 'd7_node',
+ 'd7_book',
+ ]);
+ }
+
+ /**
+ * Tests the Drupal 7 book structure to Drupal 8 migration.
+ */
+ public function testBook() {
+ $nodes = Node::loadMultiple([1, 2, 4, 6]);
+ $this->assertSame('8', $nodes[1]->book['bid']);
+ $this->assertSame('6', $nodes[1]->book['pid']);
+
+ $this->assertSame('4', $nodes[2]->book['bid']);
+ $this->assertSame('6', $nodes[2]->book['pid']);
+
+ $this->assertSame('4', $nodes[4]->book['bid']);
+ $this->assertSame('0', $nodes[4]->book['pid']);
+
+ $this->assertSame('4', $nodes[6]->book['bid']);
+ $this->assertSame('4', $nodes[6]->book['pid']);
+
+ $tree = \Drupal::service('book.manager')->bookTreeAllData(4);
+ $this->assertSame('4', $tree['49990 is - The thing about Firefly 4']['link']['nid']);
+ $this->assertSame('6', $tree['49990 is - The thing about Firefly 4']['below']['50000 Comments are closed :-( 6']['link']['nid']);
+ $this->assertSame('2', $tree['49990 is - The thing about Firefly 4']['below']['50000 Comments are closed :-( 6']['below']['50000 The thing about Deep Space 9 2']['link']['nid']);
+ $this->assertSame([], $tree['49990 is - The thing about Firefly 4']['below']['50000 Comments are closed :-( 6']['below']['50000 The thing about Deep Space 9 2']['below']);
+ }
+
+}