Capistrano 3 : Invoke one custom made task from another task

In previous versions, it was like normal ruby of JavaScript function call

You can do it by using namespace:

namespace :test do
  task :one do
  end
  task :two do
    test.one
    # or just directly call it:
    one
  end
end

Just be careful with the name you use to not overwrite some important function.