Microservice testing in itself is a very challenging task. There is no silver bullet in testing. It depends on many factors: team structure, DevOps capability, the available infrastructure, and so on. The rule, flow, or sequence of different types of testing changes according to these factors. A combination of testing techniques according to your organization's requirements is the most effective way. Automation testing is very important in the microservice architecture. It is another wheel to gain speed in microservice architecture. This will add more work for the QA team, as they have to write and maintain automated test cases. After all this, it doesn't mean that manual testing is not required. For actual user experience or sentimental testing, manual testing will be more helpful. So, a combination of both of these will be helpful and more productive.