Temporarily override config in Rails test

Question

I need to test some Rails code, but for the duration of my test I would like to override some configuration options.

With Python background, I would do this like:

def test():
    # ...
    with change_config(key, new_value):
       # do stuff with config changed
    # config is back to old value

How would I achieve this in Rails/Ruby?

Answer 1

Does this work?

def test
  Rails.config.action_mailer.delivery_method = :test
end