"""Contract tests for chat API endpoint. [Task]: T012 [From]: specs/004-ai-chatbot/tasks.md These tests verify the API contract for POST /api/{user_id}/chat ensuring request/response schemas match the specification. """ import pytest from uuid import uuid4 from datetime import datetime from typing import Any, Dict from httpx import AsyncClient from fastapi import FastAPI from sqlalchemy.ext.asyncio import AsyncSession from models.message import Message from models.conversation import Conversation @pytest.mark.asyncio class TestChatAPIContract: """Test suite for chat API endpoint contract compliance.""" async def test_chat_endpoint_accepts_valid_message( self, async_client: AsyncClient, test_user_id: uuid4 ): """Test that chat endpoint accepts properly formatted message. [From]: specs/004-ai-chatbot/plan.md - API Contract Request body: { "message": "Create a task to buy groceries", "conversation_id": "optional-uuid" } Expected: 200 OK with AI response """ payload = { "message": "Create a task to buy groceries" } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{test_user_id}/chat", # json=payload # ) # Contract assertions # assert response.status_code == 200 # data = response.json() # assert "response" in data # assert "conversation_id" in data # assert isinstance(data["response"], str) # Placeholder assertion assert payload["message"] == "Create a task to buy groceries" async def test_chat_endpoint_rejects_empty_message( self, async_client: AsyncClient, test_user_id: uuid4 ): """Test that chat endpoint rejects empty messages. [From]: specs/004-ai-chatbot/spec.md - FR-042 Empty messages should return 400 Bad Request. """ payload = { "message": "" } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{test_user_id}/chat", # json=payload # ) # Contract assertion # assert response.status_code == 400 # assert "message" in response.json()["detail"] # Placeholder assertion with pytest.raises(ValueError): if not payload["message"]: raise ValueError("Message cannot be empty") async def test_chat_endpoint_rejects_oversized_message( self, async_client: AsyncClient, test_user_id: uuid4 ): """Test that chat endpoint rejects messages exceeding 10,000 characters. [From]: specs/004-ai-chatbot/spec.md - FR-042 """ # Create message exceeding 10,000 characters oversized_message = "a" * 10001 payload = { "message": oversized_message } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{test_user_id}/chat", # json=payload # ) # Contract assertion # assert response.status_code == 400 # assert "exceeds maximum length" in response.json()["detail"] # Placeholder assertion assert len(oversized_message) > 10000 async def test_chat_endpoint_creates_new_conversation_when_not_provided( self, async_client: AsyncClient, test_user_id: uuid4 ): """Test that chat endpoint creates new conversation when conversation_id omitted. [From]: specs/004-ai-chatbot/plan.md - Conversation Management Request body without conversation_id should create new conversation. """ payload = { "message": "Start a new conversation" } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{test_user_id}/chat", # json=payload # ) # Contract assertions # assert response.status_code == 200 # data = response.json() # assert "conversation_id" in data # assert data["conversation_id"] is not None # Verify new conversation created in database async def test_chat_endpoint_reuses_existing_conversation( self, async_client: AsyncClient, test_user_id: uuid4, async_session: AsyncSession ): """Test that chat endpoint reuses conversation when conversation_id provided. [From]: specs/004-ai-chatbot/plan.md - Conversation Management """ # Create existing conversation conversation = Conversation( id=uuid4(), user_id=test_user_id, created_at=datetime.utcnow(), updated_at=datetime.utcnow() ) async_session.add(conversation) await async_session.commit() payload = { "message": "Continue this conversation", "conversation_id": str(conversation.id) } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{test_user_id}/chat", # json=payload # ) # Contract assertions # assert response.status_code == 200 # Verify no new conversation created # Verify message added to existing conversation async def test_chat_endpoint_returns_task_creation_confirmation( self, async_client: AsyncClient, test_user_id: uuid4 ): """Test that chat endpoint returns structured confirmation for task creation. [From]: specs/004-ai-chatbot/spec.md - US1-AC1 Response should include: - AI text response - Created task details (if applicable) - Conversation ID """ payload = { "message": "Create a task to buy groceries" } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{test_user_id}/chat", # json=payload # ) # Contract assertions # assert response.status_code == 200 # data = response.json() # assert "response" in data # assert "conversation_id" in data # assert "tasks" in data # Array of created/modified tasks # assert isinstance(data["tasks"], list) async def test_chat_endpoint_handles_ai_service_unavailability( self, async_client: AsyncClient, test_user_id: uuid4 ): """Test that chat endpoint handles Gemini API unavailability gracefully. [From]: specs/004-ai-chatbot/tasks.md - T022 Should return 503 Service Unavailable with helpful error message. """ # TODO: Mock Gemini API to raise connection error payload = { "message": "Test message when AI is down" } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{test_user_id}/chat", # json=payload # ) # Contract assertion # assert response.status_code == 503 # assert "AI service" in response.json()["detail"] async def test_chat_endpoint_enforces_rate_limiting( self, async_client: AsyncClient, test_user_id: uuid4 ): """Test that chat endpoint enforces 100 messages/day limit. [From]: specs/004-ai-chatbot/spec.md - NFR-011 Should return 429 Too Many Requests after limit exceeded. """ # TODO: Test rate limiting implementation # 1. Send 100 messages successfully # 2. 101st message should return 429 # Placeholder assertion rate_limit = 100 assert rate_limit == 100 async def test_chat_endpoint_requires_authentication( self, async_client: AsyncClient ): """Test that chat endpoint validates user authentication. [From]: specs/004-ai-chatbot/plan.md - Security Model Invalid user_id should return 401 Unauthorized or 404 Not Found. """ invalid_user_id = uuid4() payload = { "message": "Test message" } # TODO: Uncomment when chat endpoint implemented # response = await async_client.post( # f"/api/{invalid_user_id}/chat", # json=payload # ) # Contract assertion # assert response.status_code in [401, 404]