test: cover stale ledger outbox lease updates

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

tests/application/test_ledger_outbox.py

@@ -71,9 +71,9 @@ def test_writer_retries_until_success():
 
 
 def test_process_correlation_id_only_drains_requested_row():
-    outbox = InMemoryLedgerOutbox()
+    outbox = InMemoryLedgerOutbox(instance_key="inst-a")
     ledger = InMemoryLedger()
-    writer = LedgerWriter(outbox, ledger)
+    writer = LedgerWriter(outbox, ledger, instance_key="inst-a")
     first = outbox.enqueue(_trade(execution_id="e-1"))
     second = outbox.enqueue(_trade(execution_id="e-2"))
 
@@ -81,6 +81,8 @@ def test_process_correlation_id_only_drains_requested_row():
 
     assert outcome is OutboxOutcome.COMPLETED
     assert ledger.count() == 1
+    assert writer.counters["claim:claimed"] == 1
+    assert writer.counters["outcome:completed"] == 1
     assert outbox.get(first.correlation_id).status is WorkItemStatus.COMPLETED
     assert outbox.get(second.correlation_id).status is WorkItemStatus.PENDING