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 your functional test looks like this:

test "javascript response..." do   get :index end 

it will execute the HTML branch of the respond_to block.

If you try this:

test "javascript response..." do   get 'index.js' end 

it executes the view (index.js.erb) withOUT running the controller action!

Answer 1

Pass in a :format with your normal params to trigger a response in that format.

get :index, :format => 'js' 

No need to mess with your request headers.

Answer 2

with rspec:

it "should render js" do   xhr :get, 'index'   response.content_type.should == Mime::JS end 

and in your controller action:

respond_to do |format|   format.js end