I'm working on a project built with microservices, and testing has become much more challenging compared to our previous monolithic application. Each service exposes APIs, depends on other services, and is deployed independently. We've run into issues where a small API change in one service breaks another service unexpectedly.

I'm looking for advice on questions like:

• How do you approach API testing for microservices?
• Do you rely more on integration tests, contract tests, or end-to-end tests?
• How do you mock external dependencies without making tests unrealistic?
• What tools or workflows have worked well in CI/CD pipelines?
• How do you keep regression testing fast as the number of services grows?

I found this guide on API Testing For Microservices : https://keploy.io/blog/community/getting-started-with-microservices-testing, which covers different testing approaches, automation strategies, and best practices. It gave me a good overview, but I'd love to hear how other teams handle testing in production.

What has worked best for your microservices setup?