diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index 92bdb80..598fa9e 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -344,7 +344,7 @@ public function uninstall(array $module_list, $uninstall_dependents = TRUE) {
       foreach ($reasons as $reason) {
         $reason_message[] = implode(', ', $reason);
       }
-      throw new ModuleUninstallValidatorException('The following reasons prevents the modules from being uninstalled: ' . implode('; ', $reason_message));
+      throw new ModuleUninstallValidatorException('The following reasons that prevents the modules from being uninstalled: ' . implode('; ', $reason_message));
     }
     // Set the actual module weights.
     $module_list = array_map(function ($module) use ($module_data) {
diff --git a/core/modules/book/src/Tests/BookTest.php b/core/modules/book/src/Tests/BookTest.php
index b1c9fa3..e1d8552 100644
--- a/core/modules/book/src/Tests/BookTest.php
+++ b/core/modules/book/src/Tests/BookTest.php
@@ -188,6 +188,9 @@ function testBook() {
     $this->drupalLogout();
     $this->drupalLogin($this->bookAuthor);
 
+    // Check that the "Add child page" link exists.
+    $this->checkBookNode($book, array($nodes[0], $nodes[3], $nodes[4]), FALSE, FALSE, $nodes[0], array());
+
     // Check the presence of expected cache tags.
     $this->drupalGet('node/add/book');
     $this->assertCacheTag('config:book.settings');
@@ -288,6 +291,24 @@ function checkBookNode(EntityInterface $node, $nodes, $previous = FALSE, $up = F
       $this->assertRaw(\Drupal::l($text, $url), 'Next page link found.');
     }
 
+    if ($this->loggedInUser->hasPermission('add content to books')) {
+      $this->assertLink('Add child page', 0, 'The add child page link appears on the page');      
+      // Suppose we have int value for $node->id() = 10;    
+      // Create the following URL: 'node/add/book?parent=10;      
+      $url = \Drupal::url('node.add', array('node_type' => 'book'), array(
+        'query' => array('parent' => $node->id())
+      ));
+      
+      $this->assertLinkByHref($url, 0, 'The add child page link exists with the correct querystring.');
+    }
+
+    if ($this->loggedInUser->hasPermission('access printer-friendly version')) {
+      $this->assertLink('Printer-friendly version', 0, 'The Printer-friendly version link appears on the page.');
+      // Create the following URL: 'node/add/book?parent=' . $node->id();
+      $url = \Drupal::url('book.export', array('type' => 'html', 'node' => $node->id()));
+      $this->assertLinkByHref($url, 0, 'The Printer-friendly version link exists with the correct path.');
+    }
+
     // Compute the expected breadcrumb.
     $expected_breadcrumb = array();
     $expected_breadcrumb[] = \Drupal::url('<front>');
@@ -305,10 +326,12 @@ function checkBookNode(EntityInterface $node, $nodes, $previous = FALSE, $up = F
     // Compare expected and got breadcrumbs.
     $this->assertIdentical($expected_breadcrumb, $got_breadcrumb, 'The breadcrumb is correctly displayed on the page.');
 
-    // Check printer friendly version.
-    $this->drupalGet('book/export/html/' . $node->id());
-    $this->assertText($node->label(), 'Printer friendly title found.');
-    $this->assertRaw($node->body->processed, 'Printer friendly body found.');
+    if ($this->loggedInUser->hasPermission('access printer-friendly version')) {
+      // Check printer friendly version.
+      $this->drupalGet('book/export/html/' . $node->id());
+      $this->assertText($node->label(), 'Printer friendly title found.');
+      $this->assertRaw($node->body->processed, 'Printer friendly body found.');
+    }
 
     $number++;
   }
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index 896c4f8..08d2e48 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -878,12 +878,15 @@ function node_form_system_themes_admin_form_submit($form, FormStateInterface $fo
  * default home page at path 'node', an RSS feed, a recent content block, etc.),
  * the process above is followed except that hook_node_access() is not called on
  * each node for performance reasons and for proper functioning of the pager
- * system. When adding a node listing to your module, be sure to use an entity
- * query, which will add a tag of "node_access". This will allow modules dealing
- * with node access to ensure only nodes to which the user has access are
- * retrieved, through the use of hook_query_TAG_alter(). See the
- * @link entity_api Entity API topic @endlink for more information on entity
- * queries.
+ * system.So for node listing we can use db_select() query with tag of 
+ * "node_access" having a check for published/unpublished status of the nodes 
+ * with node access. See the @link entity_api Entity API topic @endlink for more
+ * information on entity queries. This will make sure that your base query does
+ * not allow for the display of unpublished nodes to users who should not have
+ * access to the node. Conditions need to be added to check the published status
+ * of the node. Tagging a query with "node_access" does not automatically check
+ * the published/unpublished status of nodes, so your base query is responsible
+ * for ensuring that unpublished nodes are not displayed to inappropriate users.
  *
  * Note: Even a single module returning an AccessResultInterface object from
  * hook_node_access() whose isForbidden() method equals TRUE will block access
diff --git a/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php b/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php
index 3720321..dec3651 100644
--- a/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php
+++ b/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php
@@ -83,7 +83,7 @@ public function testUninstallingModule() {
     }
     catch (ModuleUninstallValidatorException $e) {
       $this->pass($message);
-      $this->assertEqual($e->getMessage(), 'The following reasons prevents the modules from being uninstalled: There is data for the field extra_base_field on entity type Test entity');
+      $this->assertEqual($e->getMessage(), 'The following reasons that prevents the modules from being uninstalled: There is data for the field extra_base_field on entity type Test entity');
     }
 
     // Verify uninstalling entity_test is not possible when there is content for