rspec-service-testing

Testing Rails service objects with RSpec involves placing specs under spec/services and focusing on the public contract like .call, .find, and .search methods. You use instance_double for strict isolation to ensure robust unit tests.

The best way to isolate dependencies in RSpec service tests is using instance_double. This enforces test-first gates and ensures your service object specs remain reliable and maintainable by strictly verifying mocked interactions without hitting real implementations.

Structure RSpec tests for business logic and orchestrators using context and describe blocks. Implement shared_examples for reusable patterns, apply aggregate_failures for grouped assertions, and test clear error scenarios to cover the complete public contract.

Yes, you can use FactoryBot hash factories when testing Rails services. This approach promotes cleaner data setup within your let blocks and integrates seamlessly with travel_to for time manipulation and testing API clients.

RSpec service tests for error scenarios fail when they do not define clear error expectations or lack aggregate_failures. You must explicitly test failure paths within your .call method to ensure the service handles invalid states correctly.