How do you govern test data across microservices and teams?

In larger systems, test data isn’t just a technical problem anymore, it becomes a governance problem.

Different services, different schemas, different teams.

Some rely on shared fixtures, others on generators, some add an extra abstraction layer (GraphQL, contract mocks, API gateways).

How do you handle:

• Ownership of test data per service?

• Keeping schemas in sync with production APIs?

• Preventing teams from breaking each other’s tests via shared data?

Do you treat test data as part of your contracts, or is it still mostly ad hoc?