Tests re-ordering of books.
public function testBookOrdering() {
// Create new book.
$nodes = $this
->createBook();
$book = $this->book;
$this
->drupalLogin($this->admin_user);
$node1 = $this
->createBookNode($book->nid);
$node2 = $this
->createBookNode($book->nid);
$plid = $node1->book['mlid'];
// Head to admin screen and attempt to re-order.
$this
->drupalGet('admin/structure/book/' . $book->nid);
$edit = array(
"table[book-admin-{$node1->nid}][weight]" => 1,
"table[book-admin-{$node2->nid}][weight]" => 2,
// Put node 2 under node 1.
"table[book-admin-{$node2->nid}][plid]" => $plid,
);
$this
->drupalPost(NULL, $edit, t('Save book pages'));
// Verify weight was updated.
$this
->assertFieldByName("table[book-admin-{$node1->nid}][weight]", 1);
$this
->assertFieldByName("table[book-admin-{$node2->nid}][weight]", 2);
$this
->assertFieldByName("table[book-admin-{$node2->nid}][plid]", $plid);
}