Add test assertion, fill in fake info

Author: tconley1428

temporalio/worker/workflow_sandbox/_runner.py

@@ -33,6 +33,7 @@
     continued_run_id=None,
     cron_schedule=None,
     execution_timeout=None,
+    first_execution_run_id="sandbox-validate-first-run_id",
     headers={},
     namespace="sandbox-validate-namespace",
     parent=None,

tests/worker/test_workflow.py

@@ -1645,6 +1645,7 @@ async def run(self, past_run_ids: List[str]) -> List[str]:
         info = workflow.info()
         if info.continued_run_id:
             past_run_ids.append(info.continued_run_id)
+            assert info.first_execution_run_id == past_run_ids[0]
         workflow.continue_as_new(
             past_run_ids,
             # Add memo and retry policy to check