build 059.10: add runtime transport message models

app/tests/unit/market_data/acquisition/runtime/test_transport_messages.py

@@ -0,0 +1,36 @@
+# app/tests/unit/market_data/acquisition/runtime/test_transport_messages.py
+
+from dataclasses import FrozenInstanceError
+
+import pytest
+
+from src.market_data.acquisition.runtime.transport_messages import (
+    TransportBinaryMessage,
+    TransportTextMessage,
+)
+
+
+def test_transport_text_message() -> None:
+    message = TransportTextMessage(payload='{"ping":1}')
+
+    assert message.payload == '{"ping":1}'
+
+
+def test_transport_binary_message() -> None:
+    message = TransportBinaryMessage(payload=b"\x01\x02")
+
+    assert message.payload == b"\x01\x02"
+
+
+def test_text_message_is_immutable() -> None:
+    message = TransportTextMessage(payload="abc")
+
+    with pytest.raises(FrozenInstanceError):
+        setattr(message, "payload", "def")
+
+
+def test_binary_message_is_immutable() -> None:
+    message = TransportBinaryMessage(payload=b"\x00")
+
+    with pytest.raises(FrozenInstanceError):
+        setattr(message, "payload", b"\x01")