Conveniences for testing queues.

This module allows us to create or use existing adapter “mock” libraries. A mock adapter is an adapter that mirrors the functionality of an exisiting adapter, but instead sends the item to the mailbox of a specified process.

defmodule Adapter do
  use GenQueue.Adapter

  def handle_push(gen_queue, item, _opts) do
    GenQueue.Test.send_item(gen_queue, item)
  end
end

We can then test that our items are being pushed correctly.

use ExUnit.Case, async: true

import GenQueue.Test

# This test assumes we have a GenQueue named Queue

setup do
  setup_test_queue(Queue)
end

test "that our queue works" do
  Queue.start_link()
  Queue.push(:foo)
  assert_recieve(:foo)
end

Most adapters will provide a mirrored “mock” adapter to use with your tests.