[TEST] Add UpdateShelterCertificateFeature test

src/test/resources/features/UpdateShelterCertificate.feature

@@ -0,0 +1,30 @@
+Feature: Update Shelter Certificate
+  In order to maintain shelter certificate information
+  As a user with appropriate permissions
+  I want to be able to update a shelter certificate
+
+  Background:
+    Given There is a registered user with username "username" and password "password" and email "[email protected]"
+
+  Scenario: Update existing shelter certificate
+    Given I can login with username "username" and password "password"
+    And There is a registered shelter certificate with id "1" for shelter with name "existing_shelter"
+    When I update the shelter certificate with id "1" and new attributes:
+      | expirationDate            |
+      | 2023-12-31T00:00:00       |
+    Then The response code is 200
+
+  Scenario: Update non-existent shelter certificate
+    Given I can login with username "username" and password "password"
+    When I update the shelter certificate with id "999" and new attributes:
+      | expirationDate            |
+      | 2023-12-31T00:00:00       |
+    Then The response code is 404
+
+  Scenario: Update shelter certificate when I am not logged in
+    Given I'm not logged in
+    And There is a registered shelter certificate with id "1" for shelter with name "existing_shelter"
+    When I update the shelter certificate with id "1" and new attributes:
+      | expirationDate            |
+      | 2023-12-31T00:00:00       |
+    Then The response code is 401