In Rails, how do you functional test a Javascript response format?

Question

If your controller action looks like this:

respond_to do |format|
  format.html { raise \'Unsupported\' }
  format.js # index.js.erb
end

and yo

Answer 1

Use code like this for parameters and user id, etc., notice that format option is in the same hash of other parameters like id and nested_attributes.

put :update, {id: record.id, nested_attributes: {id: 1, name: "John"}, format: :js}, user.id