How to stop OTP processes started in ExUnit setup callback?

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Yep, just added async: false to all test files. Also, because of all processes register themselves within the local registry, I added it to the restart routine as well:

  setup do
    accounts         = TestAccounts.accounts()
    {:ok, registry}  = Registry.start_link(:unique, Postman.Registry)
    {:ok, scheduler} = Enum.map(accounts, &Map.get(&1, :name)) |> Scheduler.start_link()
    {:ok, accs_sup}  = AccountsSupervisor.start_link()
    {:ok, provisor}  = Provisor.start_link()

    on_exit fn ->
      TestUtils.kill_if_alive(accs_sup)
      TestUtils.kill_if_alive(provisor)
      TestUtils.kill_if_alive(scheduler)
      TestUtils.kill_if_alive(registry)
    end

    {:ok, accounts: accounts}
  end

and bam - Registry.start_link(:unique, Postman.Registry) throw all kinds of amazing errors:

** (MatchError) no match of right hand side value: {:error, {:already_started, #PID<0.608.0>}}

14:01:37.012 [error] GenServer Postman.Registry.PIDPartition0 terminating ** (stop) killed Last message: {:EXIT, #PID<0.566.0>, :killed}

(two different runs)