Features of microservices testing.

Testing microservices has its own features due to the distributed architecture:

• Service isolation: it is important to test each microservice separately (unit and integration tests) to ensure its correct operation.
• Interaction testing: it is necessary to verify interactions between microservices via API, using contract testing or end-to-end tests.
• Failure handling: tests should cover failure scenarios such as network failures, timeouts, and service unavailability.
• Automation: due to the large number of services, automating testing is critical for quick verification of changes.
• Testing environment: an isolated environment with mocks and stubs for external dependencies is often used.

Example: for an authorization microservice, you can write unit tests for token validation logic and integration tests that verify interaction with the user service via API.