test/medical_transcription/transcription_server_test.exs

defmodule MedicalTranscription.TranscriptionServerTest do
  @moduledoc """
  Tests for MedicalTranscription.TranscriptionServer
  """

  use MedicalTranscription.DataCase

  import MedicalTranscription.TranscriptionsFixtures

  alias MedicalTranscription.TranscriptionServer

  setup do
    sample_file =
      __DIR__
      |> Path.join("../../medasrdemo-Paul.mp3")
      |> Path.expand()

    transcription = transcription_fixture(%{filename: sample_file})
    %{transcription: transcription}
  end

  test "transcribe and tag audio", %{transcription: transcription} do
    spec = {TranscriptionServer, transcription: transcription}

    {:ok, pid} = start_supervised(spec)

    # NOTE: Monitoring the async process to ensure it completes
    # before asserting results. See https://elixirforum.com/t/whats-the-correct-way-to-handle-async-tasks-i-dont-care-about-in-an-exunit-test-error-postgrex-protocol-disconnected/36605/2
    # for further explanation.
    ref = Process.monitor(pid)

    assert_receive({:DOWN, ^ref, :process, _object, _pid}, 5_000)
  end
end