on redirect, the body will no longer include the target link

for more details:
rails/rails@c2e756a

spec/controllers/user_confirmations_controller_spec.rb

@@ -55,7 +55,7 @@
         unconfirmed_user.save!
         spree_get :show, confirmation_token: unconfirmed_user.confirmation_token
         expect(response).to be_redirect
-        expect(response.body).to include spree.edit_spree_user_password_path
+        expect(response.headers["Location"]).to include spree.edit_spree_user_password_path
       end
     end
   end