After digging fairly deeply on this issue, I\'ve come to an impasse between my understanding of the documentation and my results.
According to https://www.relishapp.com/
The simplest way to test external redirects is to use an integration test:
test "GET /my_page redirects Google" do
get "/my_page"
assert_redirected_to "https://google.com"
end
You test needs to be under your test/integration
directory or the equivalent directory where the integration tests should go.