[realusername]

It's nowhere near as equivalent, where's the behavior testing? Where is stuff like allow_any_instance_of(...).to receive(...).and_return(...)? What about shared examples? How can you patch globally the current time? Where are partial matchers like an_object_having_attributes? What about automatic db rollbacks?

Have a look on the examples here https://github.com/rspec/rspec-mocks