defmodule MultiversesTest.Replicant do
  @doc """
  allows you to replicate test module multiple times, forcing them to
  be run concurrently.  This helps prove that the system can be run
  in parallel without issue.
  """

  defmacro defmoduler(module, do: do_block) do
    module = Macro.expand(module, __CALLER__)

    replication = "REPLICATION"
    |> System.get_env("1")
    |> String.to_integer

    for index <- 1..replication do
      module_instance = Module.concat(module, "Instance#{index}Test")
      quote do
        defmodule unquote(module_instance), do: unquote(do_block)
      end
    end
  end
end