test: add FastAPI route tests for chat, report, and agents endpoints

tests/test_api_routes.py

@@ -0,0 +1,127 @@
+"""Tests for server/routes.py — FastAPI chat API endpoints."""
+
+from fastapi.testclient import TestClient
+from server.web import app
+
+
+client = TestClient(app)
+
+
+class TestChatEndpoint:
+    def test_basic_chat(self):
+        resp = client.post("/api/chat", json={
+            "message": "I need a bracket",
+            "history": [],
+            "backend": "mock",
+        })
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "responses" in data
+        assert len(data["responses"]) > 0
+
+    def test_chat_with_mentions(self):
+        resp = client.post("/api/chat", json={
+            "message": "What do you think?",
+            "history": [],
+            "mentions": ["cnc"],
+            "backend": "mock",
+        })
+        assert resp.status_code == 200
+        data = resp.json()
+        agent_ids = [r["agent_id"] for r in data["responses"]]
+        assert "cnc" in agent_ids
+
+    def test_chat_with_history(self):
+        resp = client.post("/api/chat", json={
+            "message": "Make it wider",
+            "history": [
+                {"role": "user", "content": "I need a bracket"},
+                {"role": "agent", "agent_id": "design", "content": "L-bracket suggestion."},
+            ],
+            "backend": "mock",
+        })
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "responses" in data
+
+    def test_chat_empty_message_rejected(self):
+        resp = client.post("/api/chat", json={
+            "message": "",
+            "history": [],
+            "backend": "mock",
+        })
+        assert resp.status_code == 422
+
+    def test_chat_returns_design_state(self):
+        resp = client.post("/api/chat", json={
+            "message": "60mm wide aluminum bracket",
+            "history": [],
+            "backend": "mock",
+        })
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "design_state" in data
+
+    def test_chat_at_mention_in_message(self):
+        resp = client.post("/api/chat", json={
+            "message": "@engineering what thickness?",
+            "history": [],
+            "backend": "mock",
+        })
+        assert resp.status_code == 200
+        data = resp.json()
+        agent_ids = [r["agent_id"] for r in data["responses"]]
+        assert "engineering" in agent_ids
+
+
+class TestReportEndpoint:
+    def test_basic_report(self):
+        resp = client.post("/api/report", json={
+            "part_name": "test_bracket",
+            "history": [
+                {"role": "agent", "agent_id": "design", "content": "L-bracket design."},
+                {"role": "agent", "agent_id": "engineering", "content": "3mm aluminum."},
+                {"role": "agent", "agent_id": "cnc", "content": "3-axis OK."},
+            ],
+            "backend": "mock",
+        })
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "report" in data
+        assert "test_bracket" in data["report"]
+        assert "Design Decisions" in data["report"]
+        assert "Engineering Specifications" in data["report"]
+        assert "Manufacturing Notes" in data["report"]
+
+    def test_empty_history(self):
+        resp = client.post("/api/report", json={
+            "part_name": "empty_part",
+            "history": [],
+            "backend": "mock",
+        })
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "report" in data
+
+
+class TestAgentsEndpoint:
+    def test_list_agents(self):
+        resp = client.get("/api/agents")
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "agents" in data
+        agent_ids = [a["id"] for a in data["agents"]]
+        assert "design" in agent_ids
+        assert "engineering" in agent_ids
+        assert "cnc" in agent_ids
+        assert "cad" in agent_ids
+
+    def test_agent_has_metadata(self):
+        resp = client.get("/api/agents")
+        data = resp.json()
+        agent = data["agents"][0]
+        assert "id" in agent
+        assert "name" in agent
+        assert "role" in agent
+        assert "color" in agent
+        assert "avatar" in agent