gistfile1.ex

defmodule SessionHerderTest do
  use ExUnit.Case

  setup do 
    {:ok, sup_pid} = Chat.SessionSupervisor.start_link
    {:ok, herder_pid} = Chat.SessionHerder.start_link
    {:ok, pids: [sup_pid, herder_pid]}
  end

  teardown config do
    IO.puts inspect(config[:pids])
    Enum.each config[:pids], &:erlang.exit(&1, :kill)
    :ok
  end

  test "create new session" do
    {:ok, session_id} = Chat.SessionHerder.new
    assert is_binary(session_id)
    assert Chat.SessionHerder.count == 1
  end

  test "reconnect old session" do
    {:ok, session_id} = Chat.SessionHerder.new
    assert is_binary(session_id)
    assert Chat.SessionHerder.count == 1
    :ok = Chat.SessionHerder.reconnect(session_id)
  end

end

gistfile2.txt

  1) test create new session (SessionHerderTest)
     ** (MatchError) no match of right hand side value: {:error, {:already_started, #PID<0.117.0>}}
     stacktrace:
       test/session_herder_test.ex:6: SessionHerderTest.__ex_unit_setup_0/1
       test/session_herder_test.ex:1: SessionHerderTest.__ex_unit__/2