Systems | Development | Analytics | API | Testing

Refresh the page, lose signal, switch tabs. Users expect the AI conversation to still be there when they return, with the answer picking up where it left off. Resumable token streaming makes that possible: a returning client catches up with the in-progress response instead of starting over. Making a stream resumable is an architecture decision. Starting generation, storing the response, and delivering it need to happen in separate parts of your stack.

RSpec is the most widely used testing framework for Ruby on Rails. With the rspec-rails gem (v8.x, supporting Rails 7.2–8.x), you write model specs for business logic, request specs for controllers and APIs, and system specs for browser flows — plus mailer and job specs. Run the suite with bundle exec rspec. In the first part of this series, we looked at the basics of RSpec and how well it works with Behavior Driven Development in Ruby.

What happens to transaction posting when statement traffic gets expensive? That’s the question a bank’s platform team actually needs answered before a busy month-end. It’s also a question most load tests can’t ask, because they turn one dial for the whole recording. Statements get heavier, posting gets heavier, and the average latency across both looks fine right up until customers can’t move money.