fix(realtime): correct protobuf serialization to generate .pb fixtures (#14)

Author: jloria2703

feed/files/trip_updates_bytewax.json

@@ -2,19 +2,19 @@
   "header": {
     "gtfs_realtime_version": "2.0",
     "incrementality": "FULL_DATASET",
-    "timestamp": 1762132640
+    "timestamp": 1763932780
   },
   "entity": [
     {
       "id": "trip_FAKE_TRIP_001",
       "trip_update": {
-        "timestamp": 1762132640,
+        "timestamp": 1763932780,
         "trip": {
           "trip_id": "FAKE_TRIP_001",
           "route_id": "FAKE_ROUTE_1",
           "direction_id": 0,
-          "start_time": "01:17:20",
-          "start_date": "20251103",
+          "start_time": "21:19:40",
+          "start_date": "20251123",
           "schedule_relationship": "SCHEDULED"
         },
         "vehicle": {
@@ -26,19 +26,19 @@
           {
             "stop_id": "STOP_A",
             "arrival": {
-              "time": 1762132702
+              "time": 1763932949
             }
           },
           {
             "stop_id": "STOP_B",
             "arrival": {
-              "time": 1762132749
+              "time": 1763932870
             }
           },
           {
             "stop_id": "STOP_C",
             "arrival": {
-              "time": 1762132867
+              "time": 1763932995
             }
           }
         ]

feed/files/trip_updates_bytewax.pb

@@ -214,7 +214,7 @@ def save_sample_binaries():
                 entity.alert.header_text.translation.add(text="Sample Alert")
                 entity.alert.informed_entity.add().route_id = "R001"
 
-            with open(f"tests/data/{sample}.bin", "wb") as f:
+            with open(f"tests/data/{sample}.pb", "wb") as f:
                 f.write(feed.SerializeToString())
 
         print("Sample GTFS-RT binaries written to tests/data/")