RSpec Verifying Doubles: Choosing instance_double, class_double, or object_double
Use RSpec verifying doubles to catch stale mocks early. Compare instance_double, class_double, and object_double with validation steps.
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rspecRSpec verifying doubles as an architectural boundary for unit tests
Verifying doubles replace plain doubles at owned seams so unit tests fail when a collaborator's API changes. This note covers requirements, trust boundaries, failure modes, and when to use integration tests instead.