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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.

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commanded test process_managers resume_process_manager_test.exs
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test/process_managers/resume_process_manager_test.exs 

defmodule Commanded.ProcessManagers.ResumeProcessManagerTest do

  use Commanded.StorageCase



  import Commanded.Assertions.EventAssertions



  alias Commanded.Helpers.{ProcessHelper,Wait}

  alias Commanded.ProcessManagers.{ProcessRouter,ProcessManagerInstance}

  alias Commanded.ProcessManagers.{ResumeRouter,ResumeProcessManager}

  alias Commanded.ProcessManagers.ResumeAggregate.Commands.{StartProcess,ResumeProcess}

  alias Commanded.ProcessManagers.ResumeAggregate.Events.{ProcessStarted,ProcessResumed}



  test "should resume a process manager with same state when process restarts" do

    process_uuid = UUID.uuid4



    {:ok, process_router} = ResumeProcessManager.start_link()



    :ok = ResumeRouter.dispatch(%StartProcess{process_uuid: process_uuid, status: "start"})



    assert_receive_event ProcessStarted, fn event ->

      assert event.process_uuid == process_uuid

      assert event.status == "start"

    end



    # wait for process instance to receive event

    Wait.until(fn ->

      process_instance = ProcessRouter.process_instance(process_router, process_uuid)



      assert process_instance != {:error, :process_manager_not_found}

      assert %{status_history: ["start"]} = ProcessManagerInstance.process_state(process_instance)

    end)



    ProcessHelper.shutdown(process_router)



    # wait for subscription to receive DOWN notification and remove subscription's PID

    :timer.sleep(1_000)



    {:ok, process_router} = ResumeProcessManager.start_link()



    :ok = ResumeRouter.dispatch(%ResumeProcess{process_uuid: process_uuid, status: "resume"})



    wait_for_event(ProcessResumed, fn event -> event.process_uuid == process_uuid end)



    Wait.until(fn ->

      process_instance = ProcessRouter.process_instance(process_router, process_uuid)

      assert process_instance != {:error, :process_manager_not_found}



      state = ProcessManagerInstance.process_state(process_instance)

      assert state.status_history == ["start", "resume"]

    end)

  end

end