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+@mod @mod_workshop
+Feature: File types of the submission and feedback attachments can be limitted
+  In order to constrain student submission and feedback attachments
+  As a teacher
+  I need to be able to specify the list of allowed file types
+
+  Background:
+    Given the following "users" exist:
+      | username | firstname | lastname | email            |
+      | teacher1 | Terry1    | Teacher1 | teacher1@example.com |
+      | student1 | Sam1      | Student1 | student1@example.com |
+      | student2 | Sam2      | Student2 | student2@example.com |
+    And the following "courses" exist:
+      | fullname  | shortname |
+      | Course1   | c1        |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | teacher1 | c1     | editingteacher |
+      | student1 | c1     | student        |
+      | student2 | c1     | student        |
+    And the following "activities" exist:
+      | activity | name         | intro                     | course | idnumber  |
+      | workshop | TestWorkshop | Test workshop description | c1     | workshop1 |
+
+  @_file_upload @javascript
+  Scenario: Student submission attachments obey the list of allowed file types
+    # Define workshop to accept only images as submission attachments.
+    Given I log in as "teacher1"
+    And I am on "Course1" course homepage
+    And I follow "TestWorkshop"
+    And I navigate to "Edit settings" in current page administration
+    And I expand all fieldsets
+    And I set the field "Submission attachment allowed file types" to "image"
+    And I press "Save and display"
+    And I change phase in workshop "TestWorkshop" to "Submission phase"
+    And I log out
+    # As a student, attempt to attach a non-image file.
+    And I log in as "student1"
+    And I am on "Course1" course homepage
+    And I follow "TestWorkshop"
+    And I press "Start preparing your submission"
+    And I set the following fields to these values:
+      | Title              | Submission1           |
+      | Submission content | See the attached file |
+    And I upload "mod/workshop/tests/fixtures/testable.php" file to "Attachment" filemanager
+    When I press "Save changes"
+    Then I should see "Some files (testable.php) cannot be uploaded. Only file types image are allowed."
+    # Remove the invalid file and attach an image instead.
+    And I delete "testable.php" from "Attachment" filemanager
+    And I upload "mod/workshop/tests/fixtures/moodlelogo.png" file to "Attachment" filemanager
+    And I press "Save changes"
+    And "//div[@class='submission-full' and contains(.,'Submission1') and contains(.,'submitted on')]" "xpath_element" should exist
+
+  @_file_upload @javascript
+  Scenario: Overall feedback attachments obey the list of allowed file types
+    # Define workshop to accept only .php files as overall feedback attachments.
+    Given I log in as "teacher1"
+    And I am on "Course1" course homepage
+    And I edit assessment form in workshop "TestWorkshop" as:"
+      | id_description__idx_0_editor | Aspect1 |
+      | id_description__idx_1_editor | Aspect2 |
+      | id_description__idx_2_editor |         |
+    And I follow "TestWorkshop"
+    And I navigate to "Edit settings" in current page administration
+    And I expand all fieldsets
+    And I set the field "Maximum number of overall feedback attachments" to "2"
+    And I set the field "Feedback attachment allowed file types" to "PHP"
+    And I press "Save and display"
+    And I change phase in workshop "TestWorkshop" to "Submission phase"
+    And I log out
+    # As a student, attempt to attach an invalid file.
+    And I log in as "student1"
+    And I am on "Course1" course homepage
+    And I follow "TestWorkshop"
+    And I add a submission in workshop "TestWorkshop" as:"
+      | Title              | Submission1  |
+      | Submission content | Some content |
+    And I log out
+    # As a teacher, allocate that submission to be assessed by another student.
+    And I log in as "teacher1"
+    And I am on "Course1" course homepage
+    And I follow "TestWorkshop"
+    And I allocate submissions in workshop "TestWorkshop" as:"
+      | Participant   | Reviewer      |
+      | Sam1 Student1 | Sam2 Student2 |
+    And I change phase in workshop "TestWorkshop" to "Assessment phase"
+    And I log out
+    # As the other student, assess the assigned submission.
+    And I log in as "student2"
+    And I am on "Course1" course homepage
+    And I follow "TestWorkshop"
+    And I follow "Submission1"
+    And I press "Assess"
+    And I set the following fields to these values:
+      | grade__idx_0            | 5 / 10            |
+      | peercomment__idx_0      | You can do better |
+      | grade__idx_1            | 10 / 10           |
+      | peercomment__idx_1      | Amazing           |
+      | Feedback for the author | Good work         |
+    # We can't directly upload the invalid file here as the upload repository would throw an exception.
+    # So instead we try to trick the filemanager and bypass its checks, to be finally stopped by the
+    # form field validation.
+    And I upload "mod/workshop/tests/fixtures/testable.php" file to "Attachment" filemanager
+    And I follow "testable.php"
+    And I set the field "Name" to "renamed.png"
+    And I press "Update"
+    When I press "Save and close"
+    Then I should see "Some files (renamed.png) cannot be uploaded. Only file types .php are allowed."
+    # Finally make sure that allowed file gets uploaded.
+    And I delete "renamed.png" from "Attachment" filemanager
+    And I upload "mod/workshop/tests/fixtures/testable.php" file to "Attachment" filemanager
+    And I press "Save and close"
+    And I should see "Assigned submissions to assess"
+    And I should see "Re-assess"