defmodule MyStack.Test do

  require MyStack

  use ExUnit.Case, async: true
  
  defmodule MySupervisor do
    use Supervisor

    def start_link do
      Supervisor.start_link(__MODULE__, :ok)
    end

    def init(:ok) do
      children = [
        %{id: 1, start: {MyStack, :start_link, [[name: :my_server]]}},
        %{id: 2, start: {MyStack, :start_link, [[name: :my_server2]]}}
      ]

      Supervisor.init(children, strategy: :one_for_one)
    end
  end

  setup do
    {:ok, supervisor: MySupervisor.start_link()}
  end

  test "server starts with an empty client list", %{supervisor: supervisor} do
    send(:my_server, {:push, 2})
    assert GenServer.call(:my_server, :pop) == 2
    send(:my_server, {:push, 1})
    send(:my_server, {:push, 4})
    send(:my_server2, {:push, 3})
    send(:my_server2, {:push, 8})
    assert GenServer.call(:my_server2, :pop) == 8
    assert GenServer.call(:my_server, :pop) == 4
    assert GenServer.call(:my_server2, :pop) == 3
    assert GenServer.call(:my_server, :pop) == 1
  end
end