Add pytest configuration and test fixtures

tests/__init__.py

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+"""Tests for Cascade."""

tests/conftest.py

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+"""Pytest configuration and fixtures."""
+
+import pytest
+from unittest.mock import AsyncMock, MagicMock
+
+
+@pytest.fixture
+def sample_queries():
+    """Sample queries for testing."""
+    return {
+        "simple": [
+            "Hello",
+            "What is 2 + 2?",
+            "What is the capital of France?",
+            "Hi there",
+            "Thanks!",
+        ],
+        "medium": [
+            "Explain the difference between TCP and UDP.",
+            "What are the main features of Python 3.11?",
+            "How does garbage collection work in Java?",
+            "Describe the MVC architecture pattern.",
+        ],
+        "complex": [
+            "Write a Python function that implements a binary search tree.",
+            "Create a REST API with authentication using FastAPI.",
+            "Implement a neural network from scratch in Python.",
+            "Design a distributed caching system with Redis.",
+            "Write a compiler for a simple programming language.",
+        ],
+    }
+
+
+@pytest.fixture
+def mock_openai_response():
+    """Mock OpenAI API response."""
+    return {
+        "id": "chatcmpl-123",
+        "object": "chat.completion",
+        "created": 1234567890,
+        "model": "gpt-4o",
+        "choices": [
+            {
+                "index": 0,
+                "message": {
+                    "role": "assistant",
+                    "content": "This is a test response.",
+                },
+                "finish_reason": "stop",
+            }
+        ],
+        "usage": {
+            "prompt_tokens": 10,
+            "completion_tokens": 20,
+            "total_tokens": 30,
+        },
+    }
+
+
+@pytest.fixture
+def mock_redis_client():
+    """Mock Redis client."""
+    client = AsyncMock()
+    client.get.return_value = None
+    client.setex.return_value = True
+    client.delete.return_value = 1
+    client.ping.return_value = True
+    return client
+
+
+@pytest.fixture
+def mock_qdrant_client():
+    """Mock Qdrant client."""
+    client = MagicMock()
+    client.search.return_value = []
+    client.upsert.return_value = None
+    return client