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with_routing(&block)

A helper to make it easier to test different route configurations. This method temporarily replaces @routes with a new RouteSet instance before each test.

The new instance is yielded to the passed block. Typically the block will create some routes using set.draw { match ... }:

with_routing do |set|
  set.draw do
    resources :users
  end
end

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/testing/assertions/routing.rb, line 89
def with_routing(&block)
  old_routes, old_controller = nil

  setup do
    old_routes, old_controller = @routes, @controller
    create_routes(&block)
  end

  teardown do
    reset_routes(old_routes, old_controller)
  end
end