Initial import of NousResearch/hermes-agent

tests/run_agent/test_switch_model_fallback_prune.py

@@ -0,0 +1,104 @@
+"""Regression test for TUI v2 blitz bug: explicit /model --provider switch
+silently fell back to the old primary provider on the next turn because the
+fallback chain — seeded from config at agent __init__ — kept entries for the
+provider the user just moved away from.
+
+Reported: "switched from openrouter provider to anthropic api key via hermes
+model and the tui keeps trying openrouter".
+"""
+
+from unittest.mock import MagicMock, patch
+
+from run_agent import AIAgent
+
+
+def _make_agent(chain):
+    agent = AIAgent.__new__(AIAgent)
+
+    agent.provider = "openrouter"
+    agent.model = "x-ai/grok-4"
+    agent.base_url = "https://openrouter.ai/api/v1"
+    agent.api_key = "or-key"
+    agent.api_mode = "chat_completions"
+    agent.client = MagicMock()
+    agent._client_kwargs = {"api_key": "or-key", "base_url": "https://openrouter.ai/api/v1"}
+    agent.context_compressor = None
+    agent._anthropic_api_key = ""
+    agent._anthropic_base_url = None
+    agent._anthropic_client = None
+    agent._is_anthropic_oauth = False
+    agent._cached_system_prompt = "cached"
+    agent._primary_runtime = {}
+    agent._fallback_activated = False
+    agent._fallback_index = 0
+    agent._fallback_chain = list(chain)
+    agent._fallback_model = chain[0] if chain else None
+
+    return agent
+
+
+def _switch_to_anthropic(agent):
+    with (
+        patch("agent.anthropic_adapter.build_anthropic_client", return_value=MagicMock()),
+        patch("agent.anthropic_adapter.resolve_anthropic_token", return_value="sk-ant-xyz"),
+        patch("agent.anthropic_adapter._is_oauth_token", return_value=False),
+        patch("hermes_cli.timeouts.get_provider_request_timeout", return_value=None),
+    ):
+        agent.switch_model(
+            new_model="claude-sonnet-4-5",
+            new_provider="anthropic",
+            api_key="sk-ant-xyz",
+            base_url="https://api.anthropic.com",
+            api_mode="anthropic_messages",
+        )
+
+
+def test_switch_drops_old_primary_from_fallback_chain():
+    agent = _make_agent([
+        {"provider": "openrouter", "model": "x-ai/grok-4"},
+        {"provider": "nous", "model": "hermes-4"},
+    ])
+
+    _switch_to_anthropic(agent)
+
+    providers = [entry["provider"] for entry in agent._fallback_chain]
+
+    assert "openrouter" not in providers, "old primary must be pruned"
+    assert "anthropic" not in providers, "new primary is redundant in the chain"
+    assert providers == ["nous"]
+    assert agent._fallback_model == {"provider": "nous", "model": "hermes-4"}
+
+
+def test_switch_with_empty_chain_stays_empty():
+    agent = _make_agent([])
+
+    _switch_to_anthropic(agent)
+
+    assert agent._fallback_chain == []
+    assert agent._fallback_model is None
+
+
+def test_switch_initializes_missing_fallback_attrs():
+    agent = _make_agent([])
+    del agent._fallback_chain
+    del agent._fallback_model
+
+    _switch_to_anthropic(agent)
+
+    assert agent._fallback_chain == []
+    assert agent._fallback_model is None
+
+
+def test_switch_within_same_provider_preserves_chain():
+    chain = [{"provider": "openrouter", "model": "x-ai/grok-4"}]
+    agent = _make_agent(chain)
+
+    with patch("hermes_cli.timeouts.get_provider_request_timeout", return_value=None):
+        agent.switch_model(
+            new_model="openai/gpt-5",
+            new_provider="openrouter",
+            api_key="or-key",
+            base_url="https://openrouter.ai/api/v1",
+        )
+
+    assert agent._fallback_chain == chain