Microservices are distributed applications deployed in different environments and could be developed in different programming languages having different databases with too many internal and external communications. Therefore, a microservices architecture is dependent on multiple interdependent applications for its end-to-end functionalities. This complex microservices architecture requires a systematic testing strategy to ensure end-to-end (E2E) testing for any given use case. In this blog, we will discuss some of the most adopted automation testing strategies for microservices, and to do that, we will use the testing triangle approach.
Testing Triangle
It's a modern way of testing microservices with a bottom-up approach, which is also part of the "Shift-left" testing methodology (The "shift-left" testing method pushes testing towards the early stages of software development. By testing early and often, you can reduce the number of bugs and increase the code quality.). The goal of having multiple stacked layers of the following test pyramid for microservices is to identify different types of issues at the beginning of testing levels. So, in the end, you will have very few production issues. Each type of testing focuses on a different layer of the overall software system and verifies expected results. For a distributed microservices app, the tests can be organized into the following layers using a bottom-up approach: