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diff --git a/web/core/modules/book/tests/src/FunctionalJavascript/BookJavascriptTest.php b/web/core/modules/book/tests/src/FunctionalJavascript/BookJavascriptTest.php
new file mode 100644
index 000000000..d8d406b44
--- /dev/null
+++ b/web/core/modules/book/tests/src/FunctionalJavascript/BookJavascriptTest.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace Drupal\Tests\book\FunctionalJavascript;
+
+use Behat\Mink\Exception\ExpectationException;
+use Drupal\Component\Render\FormattableMarkup;
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
+use Drupal\node\Entity\Node;
+
+/**
+ * Tests Book javascript functionality.
+ *
+ * @group book
+ */
+class BookJavascriptTest extends JavascriptTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['book'];
+
+  /**
+   * Tests re-ordering of books.
+   */
+  public function testBookOrdering() {
+    $book = Node::create([
+      'type' => 'book',
+      'title' => 'Book',
+      'book' => ['bid' => 'new'],
+    ]);
+    $book->save();
+    $page1 = Node::create([
+      'type' => 'book',
+      'title' => '1st page',
+      'book' => ['bid' => $book->id(), 'pid' => $book->id(), 'weight' => 0],
+    ]);
+    $page1->save();
+    $page2 = Node::create([
+      'type' => 'book',
+      'title' => '2nd page',
+      'book' => ['bid' => $book->id(), 'pid' => $book->id(), 'weight' => 1],
+    ]);
+    $page2->save();
+
+    // Head to admin screen and attempt to re-order.
+    $this->drupalLogin($this->drupalCreateUser(['administer book outlines']));
+    $this->drupalGet('admin/structure/book/' . $book->id());
+
+    $page = $this->getSession()->getPage();
+
+    $weight_select1 = $page->findField("table[book-admin-{$page1->id()}][weight]");
+    $weight_select2 = $page->findField("table[book-admin-{$page2->id()}][weight]");
+
+    // Check that rows weight selects are hidden.
+    $this->assertFalse($weight_select1->isVisible());
+    $this->assertFalse($weight_select2->isVisible());
+
+    // Check that '2nd page' row is heavier than '1st page' row.
+    $this->assertGreaterThan($weight_select1->getValue(), $weight_select2->getValue());
+
+    // Check that '1st page' precedes the '2nd page'.
+    $this->assertOrderInPage(['1st page', '2nd page']);
+
+    // Check that the 'unsaved changes' text is not present in the message area.
+    $this->assertSession()->pageTextNotContains('You have unsaved changes.');
+
+    // Drag and drop the '1st page' row over the '2nd page' row.
+    // @todo: Test also the reverse, '2nd page' over '1st page', when
+    //   https://www.drupal.org/node/2769825 is fixed.
+    // @see https://www.drupal.org/node/2769825
+    $dragged = $this->xpath("//tr[@data-drupal-selector='edit-table-book-admin-{$page1->id()}']//a[@class='tabledrag-handle']")[0];
+    $target = $this->xpath("//tr[@data-drupal-selector='edit-table-book-admin-{$page2->id()}']//a[@class='tabledrag-handle']")[0];
+    $dragged->dragTo($target);
+
+    // Give javascript some time to manipulate the DOM.
+    $this->assertJsCondition('jQuery(".tabledrag-changed-warning").is(":visible")');
+
+    // Check that the 'unsaved changes' text appeared in the message area.
+    $this->assertSession()->pageTextContains('You have unsaved changes.');
+
+    // Check that '2nd page' page precedes the '1st page'.
+    $this->assertOrderInPage(['2nd page', '1st page']);
+
+    $this->submitForm([], 'Save book pages');
+    $this->assertSession()->pageTextContains(new FormattableMarkup('Updated book @book.', ['@book' => $book->getTitle()]));
+
+    // Check that page reordering was done in the backend for drag-n-drop.
+    $page1 = Node::load($page1->id());
+    $page2 = Node::load($page2->id());
+    $this->assertGreaterThan($page2->book['weight'], $page1->book['weight']);
+
+    // Check again that '2nd page' is on top after form submit in the UI.
+    $this->assertOrderInPage(['2nd page', '1st page']);
+
+    // Toggle row weight selects as visible.
+    $page->findButton('Show row weights')->click();
+
+    // Check that rows weight selects are visible.
+    $this->assertTrue($weight_select1->isVisible());
+    $this->assertTrue($weight_select2->isVisible());
+
+    // Check that '1st page' row became heavier than '2nd page' row.
+    $this->assertGreaterThan($weight_select2->getValue(), $weight_select1->getValue());
+
+    // Reverse again using the weight fields. Use the current values so the test
+    // doesn't rely on knowing the values in the select boxes.
+    $value1 = $weight_select1->getValue();
+    $value2 = $weight_select2->getValue();
+    $weight_select1->setValue($value2);
+    $weight_select2->setValue($value1);
+
+    // Toggle row weight selects back to hidden.
+    $page->findButton('Hide row weights')->click();
+
+    // Check that rows weight selects are hidden again.
+    $this->assertFalse($weight_select1->isVisible());
+    $this->assertFalse($weight_select2->isVisible());
+
+    $this->submitForm([], 'Save book pages');
+    $this->assertSession()->pageTextContains(new FormattableMarkup('Updated book @book.', ['@book' => $book->getTitle()]));
+
+    // Check that the '1st page' is first again.
+    $this->assertOrderInPage(['1st page', '2nd page']);
+
+    // Check that page reordering was done in the backend for manual weight
+    // field usage.
+    $page1 = Node::load($page1->id());
+    $page2 = Node::load($page2->id());
+    $this->assertGreaterThan($page2->book['weight'], $page1->book['weight']);
+  }
+
+  /**
+   * Asserts that several pieces of markup are in a given order in the page.
+   *
+   * @param string[] $items
+   *   An ordered list of strings.
+   *
+   * @throws \Behat\Mink\Exception\ExpectationException
+   *   When any of the given string is not found.
+   *
+   * @todo Remove this once https://www.drupal.org/node/2817657 is committed.
+   */
+  protected function assertOrderInPage(array $items) {
+    $session = $this->getSession();
+    $text = $session->getPage()->getHtml();
+    $strings = [];
+    foreach ($items as $item) {
+      if (($pos = strpos($text, $item)) === FALSE) {
+        throw new ExpectationException("Cannot find '$item' in the page", $session->getDriver());
+      }
+      $strings[$pos] = $item;
+    }
+    ksort($strings);
+    $ordered = implode(', ', array_map(function ($item) {
+      return "'$item'";
+    }, $items));
+    $this->assertSame($items, array_values($strings), "Found strings, ordered as: $ordered.");
+  }
+
+}