Integration Testing with External Services

Quick Start

This skill helps you set up integration tests with external services:

• Testcontainers: Run real services in Docker containers for testing
• WireMock: Mock HTTP services and APIs
• LocalStack: Local AWS services (S3) for testing without AWS dependency
• SFTP: Integration testing with SFTP servers

When to Use This Skill

Use this skill when you need to:

• Set up integration tests with external services
• Test applications against real databases/message queues in isolation
• Mock HTTP APIs for reliable testing
• Test S3 integration without using real AWS resources
• Configure automated integration test environments

Setup Options

Testcontainers Setup

For integration tests with real services:

# Basic testcontainers example
from testcontainers.postgres import PostgresContainer

def test_with_postgres():
    with PostgresContainer("postgres:15") as postgres:
        connection_string = postgres.get_connection_url()
        # Run tests with real PostgreSQL

See testcontainers-guide.md for detailed setup.

WireMock Setup

For mocking HTTP services:

# WireMock configuration example
from wiremock import WireMockServer

def test_with_wiremock():
    with WireMockServer() as wiremock:
        wiremock.stub_for(
            request_method="GET",
            request_url="/api/users",
            response_body='{"users": []}'
        )
        # Test against mocked API

See wiremock-patterns.md for common patterns.

LocalStack Setup

For testing S3 without AWS:

# LocalStack S3 testing example
import boto3
from localstack import start_localstack

def test_s3_with_localstack():
    with start_localstack(services=["s3"]) as localstack:
        s3 = boto3.client('s3', endpoint_url=localstack.endpoint_url)
        # Test S3 operations locally

See localstack-s3-config.md for S3 configuration.

SFTP Integration Testing

For testing SFTP connectivity and operations:

# SFTP integration test example
from paramiko import SSHClient

def test_sftp_operations():
    with SSHClient() as ssh:
        ssh.connect('sftp-server', username='test', password='test')
        sftp = ssh.open_sftp()
        # Test SFTP file operations

Available Templates

Ready-to-use test templates for common scenarios:

• templates/testcontainers-python.py - Python testcontainers setup
• templates/wiremock-http-tests.py - WireMock HTTP API tests
• templates/localstack-s33-tests.py - LocalStack S3 integration tests
• templates/sftp-integration-tests.py - SFTP integration testing

Helper Scripts

Setup scripts to initialize test environments:

• scripts/setup_testcontainers.py - Configure testcontainers environment
• scripts/init_wiremock.py - Initialize WireMock server
• scripts/start_localstack.py - Start LocalStack services

Best Practices

1. Container Management: Always use context managers for container lifecycle
2. Port Conflicts: Configure ports to avoid conflicts with local services
3. Cleanup: Ensure proper cleanup of resources in test teardown
4. Environment Variables: Use env vars for configuration, avoid hardcoded values
5. Parallel Testing: Design tests to run in parallel where possible

Getting Help

For detailed setup and patterns, see:

• Testcontainers Guide
• WireMock Patterns
• LocalStack S3 Config

Security & Compliance

This skill is designed SOLELY for legitimate integration testing purposes in isolated development environments.

⚠️ Important Security Notes

• Development Use Only: Never deploy test containers or services to production networks
• Isolated Environments: All services run locally and are destroyed after testing
• Educational Purpose: Designed to teach proper testing methodologies
• Full Transparency: Source code is fully visible and auditable

For detailed security information, see SECURITY.md