Assembly Management Rework - Stage 5 & 6 Complete (Stage 4 Pending)

Data/Engine/tests/assemblies/test_payloads.py

@@ -0,0 +1,37 @@
+# ======================================================
+# Data\Engine\tests\assemblies\test_payloads.py
+# Description: Exercises PayloadManager storage, mirroring, and deletion behaviours.
+#
+# API Endpoints (if applicable): None
+# ======================================================
+
+from __future__ import annotations
+
+import base64
+from pathlib import Path
+
+from Data.Engine.assembly_management.models import PayloadType
+from Data.Engine.assembly_management.payloads import PayloadManager
+
+
+def test_payload_manager_store_update_delete(tmp_path: Path) -> None:
+    staging_root = tmp_path / "staging"
+    runtime_root = tmp_path / "runtime"
+    manager = PayloadManager(staging_root=staging_root, runtime_root=runtime_root)
+
+    content = base64.b64encode(b"payload-bytes").decode("ascii")
+    descriptor = manager.store_payload(PayloadType.SCRIPT, content, assembly_guid="abc123", extension=".json")
+
+    staging_path = staging_root / "abc123" / descriptor.file_name
+    runtime_path = runtime_root / "abc123" / descriptor.file_name
+    assert staging_path.is_file()
+    assert runtime_path.is_file()
+    assert descriptor.size_bytes == len(content)
+
+    updated = manager.update_payload(descriptor, content + "-v2")
+    assert updated.size_bytes == len(content + "-v2")
+    assert staging_path.read_text(encoding="utf-8").endswith("-v2")
+
+    manager.delete_payload(descriptor)
+    assert not staging_path.exists()
+    assert not runtime_path.exists()