Which of the following testing types verifies the interactions between services in microservices?

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Integration testing is the correct choice for verifying the interactions between services in microservices. In a microservices architecture, several independent services work together to form a complete application. Integration testing focuses on the interfaces and interactions between these services to ensure they communicate properly, share data correctly, and function as intended when combined.

Integration tests typically check scenarios like how one service interacts with another, the flow of data between them, and the overall behavior of the system when services are integrated. This is crucial in microservices, where the efficacy of one service often depends on the cooperation and response of others.

In contrast, unit testing is aimed at verifying individual components or functions in isolation, without regard to their interactions with other components. End-to-end testing simulates user scenarios by testing the entire application workflow, which may include multiple services but does not focus specifically on just the interactions between services. Static testing refers to reviewing code or documents without executing code, which does not involve testing the interactions between services at all. Therefore, integration testing is specifically designed to address the complexities of interactions in a microservices architecture.