change rails environment in the mid of testing

Question

How to change the environment variable of rails in testing

Answer 1

If you're using something like rspec, you can stub Rails.env to return a different value for the specific test example you're running:

it "should log something in production" do
  Rails.stub(:env).and_return('production')
  Rails.logger.should_receive(:warning).with("message")
  run_your_code
end