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

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commanded test event event_handler_error_handling_test.exs
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test/event/event_handler_error_handling_test.exs 

defmodule Commanded.Event.EventHandlerErrorHandlingTest do

  use Commanded.StorageCase



  defmodule ErrorEventHandler do

    use Commanded.Event.Handler, name: "ErrorEventHandler"



    alias Commanded.ExampleDomain.BankAccount.Events.BankAccountOpened



    def handle(%BankAccountOpened{}, _metadata), do: {:error, :failed}

  end



  alias Commanded.ExampleDomain.BankAccount.Commands.OpenAccount

  alias Commanded.ExampleDomain.BankAccount.Events.BankAccountOpened

  alias Commanded.ExampleDomain.BankRouter

  alias Commanded.Helpers.CommandAuditMiddleware



  setup do

    CommandAuditMiddleware.start_link()

    :ok

  end



  test "should stop event handler on error" do

    account_number = UUID.uuid4()



    {:ok, handler} = ErrorEventHandler.start_link()



    Process.unlink(handler)

    ref = Process.monitor(handler)



    :ok = BankRouter.dispatch(%OpenAccount{account_number: account_number, initial_balance: 1_000})



    assert_receive {:DOWN, ^ref, _, _, _}

    refute Process.alive?(handler)

  end

end