defmodule Paratize.ChunkTest do
  use ExUnit.Case, async: true
  use Paratize.BaseTest.Common, test_impl: Paratize.Chunk

  test "parallel_exec/2 is able to execute functions in parallel and return their results in order" do
    fun_list = [
      fn -> :timer.sleep(100); 1 end,
      {:b, fn -> :timer.sleep(100); 2 end},
      fn -> :timer.sleep(100); 3 end,
      {:d, fn -> :timer.sleep(100); 4 end},
      fn -> :timer.sleep(100); 5 end,
    ]

    {time, result} = :timer.tc fn ->
      fun_list |> Paratize.Chunk.parallel_exec(%Paratize.TaskOptions{size: 3, timeout: 1000})
    end

    assert result == [1,{:b,2},3,{:d,4},5]
    assert div(time, 1000) in 200..300
  end

end