integration: add tests/test_chat.py

tests/test_chat.py

@@ -0,0 +1,90 @@
+"""DeepSeek V4 chat module tests — client, sessions, local echo, API surface."""
+
+import os
+import sys
+from pathlib import Path
+
+import pytest
+
+ROOT = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(ROOT))
+
+
+@pytest.fixture(autouse=True)
+def _clear_key(monkeypatch):
+    """Force local mode in every test."""
+    monkeypatch.delenv("DEEPSEEK_API_KEY", raising=False)
+
+
+def test_client_local_mode_defaults():
+    from chat.core import DeepSeekV4Client, DEFAULT_MODEL
+
+    client = DeepSeekV4Client()
+    assert client.local_mode is True
+    assert client.model == DEFAULT_MODEL
+    assert client.base_url == "https://api.deepseek.com/v1"
+
+
+def test_session_flow():
+    from chat.core import ChatSession, SOVEREIGN_SYSTEM_PROMPT
+
+    s = ChatSession()
+    assert s.session_id.startswith("ses_")
+    s.add("system", SOVEREIGN_SYSTEM_PROMPT)
+    s.add("user", "hello")
+    s.add("assistant", "hi")
+    api_msgs = s.to_api()
+    assert [m["role"] for m in api_msgs] == ["system", "user", "assistant"]
+    assert len(s.messages) == 3
+
+
+def test_session_history_bounded():
+    from chat.core import ChatSession
+
+    s = ChatSession(max_history=6)
+    for i in range(20):
+        s.add("user", f"msg {i}")
+    assert len(s.messages) <= 6
+
+
+def test_local_echo_completion():
+    from chat.core import ChatSession, DeepSeekV4Client
+
+    s = ChatSession()
+    s.add("user", "What modules exist?")
+    result = DeepSeekV4Client().complete(s)
+    assert result["mode"] == "local"
+    assert "Sovereign local echo" in result["content"]
+    assert "no DEEPSEEK_API_KEY" in result["content"]
+    assert result["model"] == "sovereign/deepseek-v4-sovereign"
+
+
+def test_client_env_config(monkeypatch):
+    from chat.core import DeepSeekV4Client
+
+    monkeypatch.setenv("DEEPSEEK_API_BASE", "https://example.com/v1")
+    monkeypatch.setenv("DEEPSEEK_MODEL", "custom-model")
+    client = DeepSeekV4Client()
+    assert client.base_url == "https://example.com/v1"
+    assert client.model == "custom-model"
+    assert client.local_mode is True  # no key
+
+
+def test_list_models():
+    from chat.core import DeepSeekV4Client
+
+    models = DeepSeekV4Client().list_models()
+    ids = {m["id"] for m in models}
+    assert "sovereign/deepseek-v4-sovereign" in ids
+    assert "deepseek-v4-flash-0731" in ids
+
+
+def test_api_routes():
+    from chat.api.routes import router
+
+    paths = {route.path for route in router.routes}
+    assert "/api/v1/chat/sessions" in paths
+    assert "/api/v1/chat/sessions/{session_id}" in paths
+    assert "/api/v1/chat/send" in paths
+    assert "/api/v1/chat/models" in paths
+    assert "/api/v1/chat/status" in paths