MDL-50110 mod_book: Added Behat test to automate MDLQA-7646

mod/book/tests/behat/edit_navigation_options.feature

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+@mod @mod_book
+Feature: In a book, change the navigation options
+  In order to change the way a book's chapters can be traversed
+  As a teacher
+  I need to change navigation options on a book
+
+  Background:
+    Given the following "courses" exist:
+      | fullname | shortname | category | groupmode |
+      | Course 1 | C1 | 0 | 1 |
+    And the following "users" exist:
+      | username | firstname | lastname | email |
+      | teacher1 | Teacher | 1 | teacher1@example.com |
+    And the following "course enrolments" exist:
+      | user | course | role |
+      | teacher1 | C1 | editingteacher |
+    And I log in as "teacher1"
+    And I follow "Course 1"
+    And I turn editing mode on
+
+  Scenario: Change navigation options
+    Given I add a "Book" to section "1" and I fill the form with:
+      | Name | Test book |
+      | Description | A book about lorem ipsum |
+      | Style of navigation | TOC Only         |
+    And I follow "Test book"
+    And I should see "Add new chapter"
+    And I set the following fields to these values:
+      | Chapter title | Test chapter 1 |
+      | Content | Lorem ipsum dolor sit amet |
+    And I press "Save changes"
+    And I should see "Test book"
+    And I should see "1 Test chapter 1"
+    And I click on "Add new chapter" "link" in the "Table of contents" "block"
+    And I set the following fields to these values:
+      | Chapter title | Test chapter 2 |
+      | Content | consectetur adipiscing elit |
+    And I press "Save changes"
+    And I should see "Test book"
+    And I should see "2 Test chapter 2"
+    And I click on "1 Test chapter 1" "link" in the "Table of contents" "block"
+    And "Next" "link" should not exist
+    And I click on "2 Test chapter 2" "link" in the "Table of contents" "block"
+    And "Previous" "link" should not exist
+    And I click on "Edit settings" "link" in the "Administration" "block"
+    And I set the field "Style of navigation" to "Images"
+    And I press "Save and display"
+    And "//a/child::img[contains(@src, 'nav_next')]" "xpath_element" should exist
+    And I click on "2 Test chapter 2" "link" in the "Table of contents" "block"
+    And "//a/child::img[contains(@src, 'nav_prev')]" "xpath_element" should exist
+    When I click on "Edit settings" "link" in the "Administration" "block"
+    And I set the field "Style of navigation" to "Text"
+    And I press "Save and display"
+    Then "Next" "link" should exist
+    And I click on "2 Test chapter 2" "link" in the "Table of contents" "block"
+    And "Previous" "link" should exist