Third-Party Integration Test Skill

Discovery

Before writing tests, identify:

• Service and SDK — Stripe SDK vs raw fetch to Stripe API are tested differently
• Test strategy available — does the service offer a sandbox/test mode (Stripe, Twilio), or must responses be recorded/mocked?
• Interaction type — outbound API calls, inbound webhooks, polling, or streaming
• What can fail — rate limits, network errors, malformed responses, auth failures, service-specific errors (e.g. card_declined, invalid_template_id)
• Secrets handling — test keys must never appear in fixtures or committed code

Strategy Selection

Choose based on what the service provides:

| Service has... | Use |