What kind of testing did you check between systems? How would you test a new integration service between a consumer team and a provider team?

When testing integrations between provider teams and consumer teams, it is important to verify the correctness of data exchange and service interactions.

Main steps:

• Understanding contracts: study APIs, protocols, and data formats used between services.
• API-level testing: verify that the provider service correctly processes requests and returns expected responses.
• Consumer-level testing: ensure that the consumer service correctly processes data from the provider.
• Error scenario testing: how services react to incorrect data, timeouts, unavailability.
• Test automation: write integration tests that simulate interactions between services.

For example, tools for mocking services can be used to isolate the tested service and check its behavior with various responses from the partner.