8.3Google Cloud Functions Testing

Google Cloud Functions can be tested locally using the Functions Framework:

# Install the Functions Framework for local testing
pip install functions-framework

# Run locally
functions-framework --target=process_order --port=8080

# Test with curl
curl -X POST http://localhost:8080 \
  -H "Content-Type: application/json" \
  -d '{"orderId": "ORD-123"}'

Testing Cloud Functions with pytest

# tests/test_cloud_function.py
import pytest
from unittest.mock import patch, MagicMock
from flask import Flask
import json

# Import the function
from main import process_order

@pytest.fixture
def app():
    return Flask(__name__)

@pytest.fixture
def client(app):
    return app.test_client()

def test_process_order_valid_request(app):
    """Test processing a valid order."""
    with app.test_request_context(
        method="POST",
        json={"orderId": "ORD-123", "amount": 99.99}
    ):
        from flask import request
        response = process_order(request)
        data = json.loads(response)
        assert data["status"] == "processed"

def test_process_order_missing_order_id(app):
    """Test handling of missing order ID."""
    with app.test_request_context(
        method="POST",
        json={"amount": 99.99}
    ):
        from flask import request
        response, status_code = process_order(request)
        assert status_code == 400