test: add custom message notification scenarios

Add integration tests for custom signer messages:
- Account method with and without custom description
- Email method with default and custom description via reminder
- Verifies description appears in email body before default message
- Uses Activity email notification settings in background setup

Tests cover the complete flow from request creation to email delivery.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

tests/integration/features/notification/custom_message_notification.feature

@@ -0,0 +1,59 @@
+Feature: Custom message for signers
+  In order to provide personalized instructions to signers
+  As a document owner
+  I want to send custom messages to signers via email
+
+  Background:
+    Given as user "admin"
+    And user "signer1" exists
+    And set the email of user "signer1" to "signer1@test.com"
+    And my inbox is empty
+    And reset notifications of user "signer1"
+    And run the command "libresign:configure:openssl --cn test" with result code 0
+    And run the command "config:app:set activity notify_email_libresign_file_to_sign --value=1" with result code 0
+    And run the command "user:setting signer1 activity notify_email_libresign_file_to_sign 1" with result code 0
+
+  Scenario: Account method - default message without custom description
+    When sending "post" to ocs "/apps/libresign/api/v1/request-signature"
+      | file | {"url":"<BASE_URL>/apps/libresign/develop/pdf"} |
+      | name | Document without custom message |
+      | users | [{"identify":{"account":"signer1"}}] |
+    Then the response should have a status code 200
+    And there should be 1 emails in my inbox
+    When I open the latest email to "signer1@test.com" with subject "LibreSign: There is a file for you to sign"
+    Then I should see "There is a document for you to sign" in the opened email
+
+  Scenario: Account method - custom description in email
+    When sending "post" to ocs "/apps/libresign/api/v1/request-signature"
+      | file | {"url":"<BASE_URL>/apps/libresign/develop/pdf"} |
+      | name | Document with custom message |
+      | users | [{"identify":{"account":"signer1"},"description":"Please review section 3 and the appendix before signing."}] |
+    Then the response should have a status code 200
+    And there should be 1 emails in my inbox
+    When I open the latest email to "signer1@test.com" with subject "LibreSign: There is a file for you to sign"
+    Then I should see "Please review section 3 and the appendix before signing" in the opened email
+    And I should see "There is a document for you to sign" in the opened email
+
+  Scenario: Email method - default notification
+    When sending "post" to ocs "/apps/libresign/api/v1/request-signature"
+      | file | {"url":"<BASE_URL>/apps/libresign/develop/pdf"} |
+      | name | Document for email method |
+      | users | [{"identify":{"email":"external@domain.test"},"displayName":"External Signer"}] |
+    Then the response should have a status code 200
+
+  Scenario: Email method - custom description via reminder
+    Given sending "post" to ocs "/apps/libresign/api/v1/request-signature"
+      | file | {"url":"<BASE_URL>/apps/libresign/develop/pdf"} |
+      | name | Document for email with description |
+      | users | [{"identify":{"email":"external@domain.test"},"displayName":"External Signer","description":"Urgent: Please sign by end of day."}] |
+    And the response should have a status code 200
+    And fetch field "(FILE_ID)ocs.data.data.nodeId" from previous JSON response
+    And fetch field "(SIGN_REQUEST_ID)ocs.data.data.signers.0.signRequestId" from previous JSON response
+    And my inbox is empty
+    When sending "post" to ocs "/apps/libresign/api/v1/notify/signer"
+      | fileId | <FILE_ID> |
+      | signRequestId | <SIGN_REQUEST_ID> |
+    Then the response should have a status code 200
+    And there should be 1 emails in my inbox
+    When I open the latest email to "external@domain.test"
+    Then I should see "Urgent: Please sign by end of day" in the opened email