How to Handle External Service Testing in E2E Tests?

I keep seeing Meticulous being advertised a lot in various newsletters, and I’ve been wondering how effective that tool could be for these situations. However, I don’t know anyone personally who has used it.

Definitely avoid hitting real external services in your standard E2E tests. Mock them instead! You can have a few dedicated sandbox integration tests just to ensure the contracts are still working. This helps keep your tests quick and minimizes any flakiness.

Just to reinforce, mock everything and keep your E2E tests fast. If you really need to check the GitHub integration, ensure that runs separately on a schedule or just before deployment. This way, developers don’t get stuck waiting for tests, especially when time-sensitive actions like webhook responses are involved.

I've faced this issue several times, and the best tactic is usually a combination approach. For critical paths like your billing flow, consider using contract testing (like Pact) to validate your integrations without knocking on real services constantly. This keeps your tests speedy and reliable. For integrations like GitHub, it’s a good idea to run some real E2E tests against their API, but do that separately—maybe on a nightly schedule or on-demand when needed. If available, utilize their sandbox/test environments. Another successful method I've used is recording actual API interactions once (via tools like VCR or Polly.js) and then replaying those in your tests. It builds confidence without the unpredictability of depending on external services. What does your current testing setup look like? Are you using any mocks or going straight for live calls?

Check if these external services provide sandbox environments. You should never use their production environment for testing unless it’s just read-only requests. If there's no sandbox available, you’ll need to invest time in setting up accurate mocks.