test(gateway): cover api_server multiplex /p/<profile>/ routing

Lock in profile resolution, the /p/{profile}/v1/models mirror that
clients hit, and profile-scoped model name advertisement.

tests/gateway/test_multiplex_api_server_routing.py

@@ -0,0 +1,86 @@
+"""Multiplex /p/<profile>/ routing for the api_server adapter.
+
+Mirrors ``test_multiplex_http_routing.py`` (webhook): the default listener
+owns the port, and secondary profiles are reached via a URL prefix when
+``gateway.multiplex_profiles`` is on.
+"""
+from __future__ import annotations
+
+from gateway.config import GatewayConfig, PlatformConfig
+from gateway.platforms.api_server import (
+    APIServerAdapter,
+    _PROFILE_REJECTED,
+    _api_request_profile,
+)
+
+
+def _make_adapter(multiplex: bool = True) -> APIServerAdapter:
+    cfg = PlatformConfig(enabled=True, extra={"host": "127.0.0.1", "port": 8642, "key": "test-key"})
+    adapter = APIServerAdapter(cfg)
+
+    class _Runner:
+        config = GatewayConfig(multiplex_profiles=multiplex)
+
+    adapter.gateway_runner = _Runner()
+    return adapter
+
+
+class _FakeReq:
+    def __init__(self, profile=None):
+        self.match_info = {"profile": profile} if profile is not None else {}
+
+
+class TestApiServerProfileResolution:
+    def test_no_prefix_returns_none(self):
+        adapter = _make_adapter(multiplex=True)
+        assert adapter._resolve_request_profile(_FakeReq(None)) is None
+
+    def test_prefix_ignored_when_multiplex_off(self):
+        adapter = _make_adapter(multiplex=False)
+        # Even a bogus profile is ignored (not 404'd) when multiplexing is off.
+        assert adapter._resolve_request_profile(_FakeReq("anything")) is None
+
+    def test_known_profile_accepted(self, monkeypatch):
+        adapter = _make_adapter(multiplex=True)
+        monkeypatch.setattr(
+            "hermes_cli.profiles.profiles_to_serve",
+            lambda multiplex: [("default", None), ("coder", None)],
+        )
+        assert adapter._resolve_request_profile(_FakeReq("coder")) == "coder"
+
+    def test_unknown_profile_rejected(self, monkeypatch):
+        adapter = _make_adapter(multiplex=True)
+        monkeypatch.setattr(
+            "hermes_cli.profiles.profiles_to_serve",
+            lambda multiplex: [("default", None), ("coder", None)],
+        )
+        assert adapter._resolve_request_profile(_FakeReq("ghost")) is _PROFILE_REJECTED
+
+
+class TestApiServerRouteTable:
+    def test_route_table_includes_models_and_chat(self):
+        """ /p/{profile}/v1/models must be registered — this is the 404 Fadeway hit. """
+        adapter = _make_adapter(multiplex=True)
+        paths = {path for _method, path, _handler in adapter._http_route_table()}
+        assert "/v1/models" in paths
+        assert "/v1/chat/completions" in paths
+        # connect() mirrors every native path under /p/{profile}/…
+        mirrored = {f"/p/{{profile}}{path}" for path in paths}
+        assert "/p/{profile}/v1/models" in mirrored
+        assert "/p/{profile}/v1/chat/completions" in mirrored
+
+
+class TestApiServerModelsUnderProfile:
+    def test_resolve_model_name_follows_active_profile(self, monkeypatch):
+        """When the request is scoped to a named profile, advertise that name."""
+        adapter = _make_adapter(multiplex=True)
+        adapter._model_name = "hermes-agent"
+        monkeypatch.setattr(
+            "hermes_cli.profiles.get_active_profile_name",
+            lambda: "coder",
+        )
+        token_prof = _api_request_profile.set("coder")
+        try:
+            assert adapter._resolve_model_name("") == "coder"
+        finally:
+            _api_request_profile.reset(token_prof)