Fixed verification error when expiry date element is present (#647)

Author: mdjnelson

classes/output/verify_certificate_result.php

@@ -62,9 +62,9 @@ class verify_certificate_result implements templatable, renderable {
     public string $certificatename;
 
     /**
-     * @var int|null The certificate's expiry date (optional).
+     * @var string|null The certificate's expiry date (optional).
      */
-    public ?int $expiry;
+    public ?string $expiry;
 
     /**
      * Constructor.

tests/behat/verify_certificate_with_expiry_element.feature

@@ -0,0 +1,54 @@
+@mod @mod_customcert
+Feature: Being able to verify a certificate with an expiry element
+  In order to ensure expiry elements are working as expected
+  As a teacher
+  I need to verify a certificate with an expiry element
+
+  Background:
+    Given the following "courses" exist:
+      | fullname | shortname | category |
+      | Course 1 | C1        | 0        |
+    And the following "users" exist:
+      | username | firstname | lastname | email                |
+      | teacher1 | Teacher   | 1        | teacher1@example.com |
+      | student1 | Student   | 1        | student1@example.com |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | teacher1 | C1     | editingteacher |
+      | student1 | C1     | student        |
+    And the following "activities" exist:
+      | activity   | name                 | intro                      | course | idnumber    | verifyany |
+      | customcert | Custom certificate 1 | Custom certificate 1 intro | C1     | customcert1 | 0         |
+    And I log in as "teacher1"
+    And I am on "Course 1" course homepage
+    And I follow "Custom certificate 1"
+    And I navigate to "Edit certificate" in current page administration
+    And I add the element "Code" to page "1" of the "Custom certificate 1" certificate template
+    And I set the following fields to these values:
+      | Font                     | Helvetica |
+      | Size                     | 20        |
+      | Colour                   | #045ECD   |
+      | Width                    | 20        |
+      | Reference point location | Top left  |
+    And I press "Save changes"
+    And I add the element "Expiry" to page "1" of the "Custom certificate 1" certificate template
+    And I set the following fields to these values:
+      | Date item                | Expiry date (1 year) |
+      | Date format              | 2                    |
+      | Start date               | award                |
+      | Font                     | Helvetica            |
+      | Size                     | 20                   |
+      | Colour                   | #045ECD              |
+      | Width                    | 20                   |
+      | Reference point location | Top left             |
+    And I press "Save changes"
+
+  Scenario: Verify a certificate with an expiry element
+    Given I log in as "student1"
+    And I am on "Course 1" course homepage
+    When I follow "Custom certificate 1"
+    And I press "View certificate"
+    And I log out
+    And I log in as "teacher1"
+    And I visit the verification url for the "Custom certificate 1" certificate
+    Then I verify the "Custom certificate 1" certificate for the user "student1"