How do I test a file upload in rails?

Question

I have a controller which is responsible for accepting JSON files and then processing the JSON files to do some user maintenance for our application. In user testing the fil

Answer 1

Mori's answer is correct, except that in Rails 3 instead of "ActionController::TestUploadedFile.new" you have to use "Rack::Test::UploadedFile.new".

The file object that is created can then be used as a parameter value in Rspec or TestUnit tests.

test "image upload" do
  test_image = path-to-fixtures-image + "/Test.jpg"
  file = Rack::Test::UploadedFile.new(test_image, "image/jpeg")
  post "/create", :user => { :avatar => file }
  # assert desired results
  post "/create", :user => { :avatar => file }     

  assert_response 201
  assert_response :success
end