neiam /gitgud

defmodule GitGud.TestResolver do
  @moduledoc """
  DNS for `GitGud.OutboundUrl` under test — the suite runs without a
  network. Names under `.internal.test` resolve to a private address,
  `localhost` to loopback, `dual.test` to a public and a private one;
  everything else gets a public documentation-free address.
  """

  def resolve("localhost"), do: [{127, 0, 0, 1}]
  def resolve("dual.test"), do: [{93, 184, 216, 34}, {10, 0, 0, 7}]
  def resolve("nowhere.test"), do: []

  def resolve(host) do
    if String.ends_with?(host, ".internal.test"),
      do: [{10, 1, 2, 3}],
      else: [{93, 184, 216, 34}]
  end
end