inspec/test/cookbooks/os_prepare/recipes/apt.rb

# add nginx apt repository
case node["platform"]
when "ubuntu"
  # use ppa
  apt_repository "nginx" do
    uri "ppa:nginx/stable"
    distribution node["lsb"]["codename"]
  end

  apt_repository "chef-stable" do
    uri "https://packages.chef.io/stable-apt"
    key "https://downloads.chef.io/packages-chef-io-public.key"
    distribution node["lsb"]["codename"]
    components ["main"]
    trusted true
  end
when "debian"
  # use plain repo
  apt_repository "nginx" do
    uri "http://nginx.org/packages/debian"
    distribution node["lsb"]["codename"]
    components ["nginx"]
  end

  apt_repository "chef-stable" do
    uri "https://packages.chef.io/stable-apt"
    key "https://downloads.chef.io/packages-chef-io-public.key"
    distribution node["lsb"]["codename"]
    components ["main"]
    trusted true
  end
end