fix: Mark deliveryAttempt attribute as optional in PubSubEnvelope…

… mapping class. (#239)

- Add a default value for `deliveryAttempt`.
- Implement tests for `PubSubEnvelope`.

faster_sam/schemas.py

@@ -22,7 +22,7 @@ class PubSubMessage(BaseModel):
 class PubSubEnvelope(BaseModel):
     message: PubSubMessage
     subscription: str
-    deliveryAttempt: int
+    deliveryAttempt: int = 0
 
     def into(self) -> SQSInfo:
         milliseconds = 1000

tests/test_schemas.py

@@ -0,0 +1,53 @@
+import unittest
+import base64
+from datetime import datetime, timezone
+
+from faster_sam import schemas
+
+
+class TestPubSubEnvelope(unittest.TestCase):
+    def setUp(self):
+        self.data = {
+            "message": {
+                "data": "eyJmb28iOiAiYmFyIn0=",
+                "messageId": "12132665510234298",
+                "publishTime": "2024-09-06T19:24:19.609Z",
+                "attributes": {"foo": "bar"},
+            },
+            "subscription": "projects/test/subscriptions/test",
+            "deliveryAttempt": 1,
+        }
+
+    def test_with_complete_input_data(self):
+        msg = base64.b64decode(self.data["message"]["data"]).decode()
+        dt = datetime.strptime(self.data["message"]["publishTime"], "%Y-%m-%dT%H:%M:%S.%fZ")
+        dt = dt.replace(tzinfo=timezone.utc)
+
+        envelope = schemas.PubSubEnvelope(**self.data)
+
+        self.assertEqual(envelope.message.data, msg)
+        self.assertEqual(envelope.message.messageId, self.data["message"]["messageId"])
+        self.assertEqual(envelope.message.publishTime, dt)
+        self.assertEqual(envelope.message.attributes, self.data["message"]["attributes"])
+        self.assertEqual(envelope.subscription, self.data["subscription"])
+        self.assertEqual(envelope.deliveryAttempt, self.data["deliveryAttempt"])
+
+    def test_without_delivery_attempt(self):
+        del self.data["deliveryAttempt"]
+
+        envelope = schemas.PubSubEnvelope(**self.data)
+
+        self.assertEqual(envelope.deliveryAttempt, 0)
+
+    def test_without_message_attributes(self):
+        del self.data["message"]["attributes"]
+
+        envelope = schemas.PubSubEnvelope(**self.data)
+
+        self.assertEqual(envelope.message.attributes, None)
+
+    def test_into(self):
+        envelope = schemas.PubSubEnvelope(**self.data)
+        sqs_info = envelope.into()
+
+        self.assertIsInstance(sqs_info, schemas.SQSInfo)