Ref #1055: use update field in payload for comments (#1063)

* Ref #1055: use update field in payload for comments

* Fix typing inference

Author: leplatrem

jbi/jira/service.py

@@ -290,12 +290,14 @@ def update_issue_status(self, context: ActionContext, jira_status: str):
         issue_key = context.jira.issue
         assert issue_key  # Until we have more fine-grained typing of contexts
 
-        kwargs = {}
+        kwargs: dict[str, Any] = {}
         if jira_status == "Cancelled":
             kwargs["fields"] = {
-                "comment": "Issue was cancelled.",
                 "resolution": {"name": "Invalid"},
             }
+            kwargs["update"] = {
+                "comment": [{"add": {"body": "Issue was cancelled."}}],
+            }
 
         logger.info(
             "Updating Jira status to %s",

tests/unit/jira/test_service.py

@@ -193,9 +193,11 @@ def test_update_issue_status_adds_comment_and_resolution_when_cancelled(
                 {
                     "transition": {"id": 42},
                     "fields": {
-                        "comment": "Issue was cancelled.",
                         "resolution": {"name": "Invalid"},
                     },
+                    "update": {
+                        "comment": [{"add": {"body": "Issue was cancelled."}}],
+                    },
                 }
             )
         ],