Starting a redis server when running elixir tests

test_helper.exs

Code.require_file "support/test_redis.exs", __DIR__
ExUnit.start
TestRedis.start

test_redis.exs

defmodule TestRedis do
  def start do
    run("echo 'daemonize yes\npidfile #{pid_file_path}\nport #{port}' | redis-server -")
    System.at_exit(&TestRedis.stop/1)
  end

  def stop(_exit_code) do
    {:ok, pid} = File.read(pid_file_path)
    run("kill -9 #{pid}")
  end

  defp run(cmd) do
    cmd |> String.to_char_list |> :os.cmd
  end

  defp port do
    # Get port from config here perhaps?
    6395
  end

  defp pid_file_path do
    "/tmp/redis_test.pid"
  end
end

Behövs -9?

"Is -9 needed?"

Not entirely sure -9 is needed, but it shouldn't have any bad side effects in a test env (e.g. we don't care about the data). It made writing this faster, otherwise I'd have to figure out if redis respected a normal kill in all situations, many processes don't.