Welcome to your interview.
The question is on your right: Testing Strategy in Rails. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
How do you approach testing in Ruby on Rails? What is your strategy for balancing unit, integration, and system tests?