MDL-38439 behat: New test

According to MDLQA-3, a teacher can
set one of 3 possible options for
tracking read forum posts.

mod/forum/tests/behat/track_read_posts.feature

@@ -0,0 +1,85 @@
+@mod_forum
+Feature: A teacher can set one of 3 possible options for tracking read forum posts
+  In order to ease the forum posts follow up
+  As a moodle user
+  I need to distinct the unread posts from the read ones
+
+  Background:
+    Given the following "users" exists:
+      | username | firstname | lastname | email | trackforums |
+      | student1 | Student | 1 | student1@asd.com | 1 |
+    And the following "courses" exists:
+      | fullname | shortname | category |
+      | Course 1 | C1 | 0 |
+    And the following "course enrolments" exists:
+      | user | course | role |
+      | student1 | C1 | student |
+    And I log in as "admin"
+    And I follow "Course 1"
+    And I turn editing mode on
+
+  @javascript
+  Scenario: Tracking forum posts on
+    Given I add a "forum" to section "1" and I fill the form with:
+      | Forum name | Test forum name |
+      | Forum type | Standard forum for general use |
+      | Description | Test forum description |
+      | Read tracking for this forum | On |
+    And I add a new discussion to "Test forum name" forum with:
+      | Subject | Test post subject |
+      | Message | Test post message |
+    And I wait "6" seconds
+    And I log out
+    When I log in as "student1"
+    And I follow "Course 1"
+    Then I should see "1 unread post"
+    And I follow "1 unread post"
+    And I should not see "Don't track unread posts"
+    And I follow "Test post subject"
+    And I follow "Course 1"
+    And I should not see "1 unread post"
+
+  @javascript
+  Scenario: Tracking forum posts off
+    Given I add a "forum" to section "1" and I fill the form with:
+      | Forum name | Test forum name |
+      | Forum type | Standard forum for general use |
+      | Description | Test forum description |
+      | Read tracking for this forum | Off |
+    And I add a new discussion to "Test forum name" forum with:
+      | Subject | Test post subject |
+      | Message | Test post message |
+    And I wait "6" seconds
+    And I log out
+    When I log in as "student1"
+    And I follow "Course 1"
+    Then I should not see "1 unread post"
+    And I follow "Test forum name"
+    And I should not see "Track unread posts"
+
+  @javascript
+  Scenario: Tracking forum posts optional
+    Given I add a "forum" to section "1" and I fill the form with:
+      | Forum name | Test forum name |
+      | Forum type | Standard forum for general use |
+      | Description | Test forum description |
+      | Read tracking for this forum | Optional |
+    And I add a new discussion to "Test forum name" forum with:
+      | Subject | Test post subject |
+      | Message | Test post message |
+    And I wait "6" seconds
+    And I log out
+    When I log in as "student1"
+    And I follow "Course 1"
+    Then I should see "1 unread post"
+    And I follow "Test forum name"
+    And I follow "Don't track unread posts"
+    And I wait "4" seconds
+    And I follow "Course 1"
+    And I should not see "1 unread post"
+    And I follow "Test forum name"
+    And I follow "Track unread posts"
+    And I wait "4" seconds
+    And I follow "1"
+    And I follow "Course 1"
+    And I should not see "1 unread post"