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

From The Rspec Book, B13.0:

Rails’ provides an ActionController::TestUploadedFile class which can be used to represent an uploaded file in the params hash of a controller spec, like this:

describe UsersController, "POST create" do
  after do
    # if files are stored on the file system
    # be sure to clean them up
  end

  it "should be able to upload a user's avatar image" do
    image = fixture_path + "/test_avatar.png"
    file = ActionController::TestUploadedFile.new image, "image/png"
    post :create, :user => { :avatar => file }
    User.last.avatar.original_filename.should == "test_avatar.png"
  end
end

This spec would require that you have a test_avatar.png image in the spec/fixtures directory. It would take that file, upload it to the controller, and the controller would create and save a real User model.