What testing methods should be used when testing a microservices system?

When testing a microservices system, it is recommended to use several testing methods to ensure quality and reliability:

• Unit tests — verify individual functions and methods within microservices.
• Integration tests — check the interaction between microservices and with external systems.
• Contract tests — ensure that interfaces between microservices meet expectations.
• Performance tests — evaluate how the system performs under load.
• End-to-End (E2E) tests — verify the complete business process across all microservices.
• Resilience tests — assess the system's behavior during failures of individual services.

This comprehensive approach helps identify errors at different levels and ensures the stable operation of a distributed system.