Issue #1588156 by aspilicious: Convert book tests to PSR-0.

core/modules/book/book.info

@@ -4,6 +4,5 @@ package = Core
 version = VERSION
 core = 8.x
 dependencies[] = node
-files[] = book.test
 configure = admin/content/book/settings
 stylesheets[all][] = book.theme.css

core/modules/book/lib/Drupal/book/Tests/BookTest.php

@@ -2,13 +2,15 @@
 
 /**
  * @file
- * Tests for book.module.
+ * Definition of Drupal\book\Tests\BookTest.
  */
 
+namespace Drupal\book\Tests;
+
 use Drupal\node\Node;
 use Drupal\simpletest\WebTestBase;
 
-class BookTestCase extends WebTestBase {
+class BookTest extends WebTestBase {
   protected $book;
   // $book_author is a user with permission to create and edit books.
   protected $book_author;