Let's not comment on ticket we already commented on

If the last comment on the ticket is from your pagure_user ignore
pagure.issue.comment.added topic.

Signed-off-by: Michal Konečný <mkonecny@redhat.com>

tests/plugins/test_scm_request_processor.py

@@ -7,7 +7,7 @@ import re
 from unittest.mock import call, MagicMock, Mock, patch
 
 import arrow
-from pagure_messages.issue_schema import IssueNewV1
+from pagure_messages.issue_schema import IssueCommentAddedV1, IssueNewV1
 import pytest
 
 from toddlers.exceptions import ValidationError
@@ -100,6 +100,34 @@ class TestProcess:
             caplog.records[-1].message == "The issue 100 is not open. Skipping message."
         )
 
+    def test_process_comment_already_added(self, caplog, toddler):
+        """
+        Assert that toddler will ignore comments that were already commented on by it.
+        """
+        caplog.set_level(logging.INFO)
+
+        pagure_user = "pagure_user"
+        config = {"pagure_user": pagure_user}
+
+        msg = IssueCommentAddedV1()
+        msg.body = {
+            "project": {"fullname": scm_request_processor.PROJECT_NAMESPACE},
+            "issue": {"status": "Open", "comments": [{"user": {"name": pagure_user}}]},
+        }
+
+        with patch(
+            "toddlers.plugins.scm_request_processor.SCMRequestProcessor.process_ticket"
+        ) as mock_process_ticket:
+            toddler.process(config, msg)
+
+            mock_process_ticket.assert_not_called()
+
+        assert caplog.records[
+            -1
+        ].message == "Last comment is from {0}. Ignoring the message.".format(
+            pagure_user
+        )
+
     @patch("toddlers.utils.pdc.set_pdc")
     @patch("toddlers.utils.pagure.set_pagure")
     @patch("toddlers.utils.fedora_account.set_fasjson")