enforce fixed hub destination namespace

tests/test_cli.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from rrcd.cli import _build_arg_parser, _write_default_config
+from rrcd.constants import HUB_DEST_NAME
+
+
+def test_arg_parser_rejects_dest_name_override() -> None:
+    parser = _build_arg_parser()
+
+    with pytest.raises(SystemExit):
+        parser.parse_args(["--dest-name", "custom.hub"])
+
+
+def test_default_config_does_not_emit_dest_name_field(tmp_path: Path) -> None:
+    config_path = tmp_path / "rrcd.toml"
+    identity_path = tmp_path / "hub_identity"
+
+    _write_default_config(str(config_path), str(identity_path))
+
+    content = config_path.read_text(encoding="utf-8")
+    assert "dest_name =" not in content
+    assert f"Hubs always announce on {HUB_DEST_NAME!r}." in content

tests/test_config.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+import logging
+
+from rrcd.config import ConfigManager, HubRuntimeConfig
+from rrcd.constants import HUB_DEST_NAME
+from rrcd.service import HubService
+
+
+class _FakeHub:
+    def __init__(self) -> None:
+        self.log = logging.getLogger("test")
+        self.config = HubRuntimeConfig()
+
+
+def test_apply_config_data_ignores_dest_name_override() -> None:
+    manager = ConfigManager(_FakeHub())
+    base = HubRuntimeConfig()
+
+    updated = manager.apply_config_data(
+        base,
+        {
+            "dest_name": "custom.hub",
+            "hub": {"dest_name": "custom.hub"},
+            "hub_name": "custom-name",
+        },
+    )
+
+    assert updated.dest_name == HUB_DEST_NAME
+    assert updated.hub_name == "custom-name"
+
+
+def test_service_normalizes_custom_dest_name() -> None:
+    service = HubService(HubRuntimeConfig(dest_name="custom.hub"))
+
+    assert service.config.dest_name == HUB_DEST_NAME