change rails environment in the mid of testing

Question

How to change the environment variable of rails in testing

Answer 1

As a simpler variation on several answers above, this is working for me:

allow(Rails).to receive(:env).and_return('production')

Or, for as I'm doing in shared_examples, pass that in a variable:

allow(Rails).to receive(:env).and_return(target_env)

I suspect this falls short of the ...StringInquirer... solution as your app uses additional methods to inspect the environment (e.g. env.production?, but if you code just asks for Rails.env, this is a lot more readable. YMMV.