add tests to canceled enrollment or scheduled with seat

enrollments-events/app/events/restore_seat_on_canceled.py

@@ -0,0 +1,60 @@
+from uuid import uuid4
+
+from aws_lambda_powertools import Logger
+from aws_lambda_powertools.utilities.data_classes import (
+    EventBridgeEvent,
+    event_source,
+)
+from aws_lambda_powertools.utilities.typing import LambdaContext
+from layercake.dateutils import now
+from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair
+
+from boto3clients import dynamodb_client
+from config import ENROLLMENT_TABLE, ORDER_TABLE
+
+logger = Logger(__name__)
+dyn = DynamoDBPersistenceLayer(ENROLLMENT_TABLE, dynamodb_client)
+
+
+@event_source(data_class=EventBridgeEvent)
+@logger.inject_lambda_context
+def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
+    old_image = event.detail['old_image']
+    order_id = old_image['seat']['order_id']
+    enrollment_id = old_image['id']
+    enrollment = dyn.get_item(key=KeyPair(enrollment_id, '0'))
+    now_ = now()
+
+    if enrollment['status'] != 'CANCELED':
+        return False
+
+    with dyn.transact_writer() as transact:
+        org_id = enrollment['org_id']
+
+        transact.update(
+            key=KeyPair(order_id, f'ENROLLMENT#{enrollment_id}'),
+            update_expr='SET #status = :rollback, \
+                             rollback_at = :now, \
+                             reason = :reason',
+            cond_expr='attribute_exists(sk) AND #status = :executed',
+            expr_attr_names={
+                '#status': 'status',
+            },
+            expr_attr_values={
+                ':rollback': 'ROLLBACK',
+                ':executed': 'EXECUTED',
+                ':reason': 'CANCELLATION',
+                ':now': now_,
+            },
+            table_name=ORDER_TABLE,
+        )
+        transact.put(
+            item={
+                'id': f'SEAT#ORG#{org_id}',
+                'sk': f'ORDER#{order_id}#ENROLLMENT#{uuid4()}',
+                'course': enrollment['course'],
+                'created_at': now_,
+            }
+        )
+
+    return True