lasseebert

defmodule Hub do
  @moduledoc """
  Publish/subscribe server.

  Subscription is done with a pattern.

  Example:

    {:ok, _pid} = Hub.start_link(name: :hub)
    Hub.subscribe(:hub, %{count: count} when count > 42)

lasseebert

I hereby claim:

• I am lasseebert on github.
• I am lasseebert (https://keybase.io/lasseebert) on keybase.
• I have a public key ASCwCSpB0kgQzneAi5asC6XLsoCFuUaiQa4wQICeeZkKqQo

To claim this, I am signing this object:

lasseebert

$ mix test
........

Finished in 0.09 seconds
8 tests, 0 failures

Randomized with seed 776617

lasseebert

$ mix test
.......

  1) test it uses mock in tests (MyApp.MailerTest)
     test/mailer_test.exs:4
     ** (exit) exited in: GenServer.call(MyApp.Mailer.Mock, {:update, #Function<0.6592501/1 in MyApp.Mailer.Mock.clear/0>}, 5000)
         ** (EXIT) no process
     stacktrace:
       (elixir) lib/gen_server.ex:596: GenServer.call/3
       test/mailer_test.exs:5: (test)

lasseebert

$ mix test
Compiling 18 files (.ex)

== Compilation error on file lib/my_app/mailer/mailgun.ex ==
** (ArgumentError) application :my_app is not loaded, or the configuration parameter :mailgun_domain is not set
    (elixir) lib/application.ex:261: Application.fetch_env!/2
    lib/my_app/mailer/mailgun.ex:5: (module)
    (stdlib) erl_eval.erl:670: :erl_eval.do_apply/6

lasseebert

defmodule MyApp.Mailer.Mailgun do
  @behaviour MyApp.Mailer.Behaviour

  use Mailgun.Client, [
    domain: Application.fetch_env!(:my_app, :mailgun_domain),
    key: Application.fetch_env!(:my_app, :mailgun_key)
  ]

  def send_mail(mail) do
    {:ok, _} = send_email(mail)

lasseebert

defmodule MyApp.Mailer do
  @from "[email protected]"
  @mailer_impl Application.fetch_env!(:my_app, :mailer)

  defmodule Behaviour do
    @callback send_mail([key: String.t]) :: :ok
  end

  def send_test_mail(email) do
    :ok = @mailer_impl.send_mail(

lasseebert

$ mix test
Compiling 16 files (.ex)

== Compilation error on file lib/my_app/mailer.ex ==
** (ArgumentError) application :my_app is not loaded, or the configuration parameter :mailgun_domain is not set
    (elixir) lib/application.ex:261: Application.fetch_env!/2
    lib/my_app/mailer.ex:3: (module)
    (stdlib) erl_eval.erl:670: :erl_eval.do_apply/6

lasseebert

defmodule MyApp.MailerTest do
  use ExUnit.Case

  test "it uses mock in tests" do
    MyApp.Mailer.Mock.clear
    MyApp.Mailer.send_test_mail("[email protected]")

    assert MyApp.Mailer.Mock.mails |> length == 1

    [mail] = MyApp.Mailer.Mock.mails

lasseebert

defmodule MyApp.Mailer do
  use Mailgun.Client, [
    domain: Application.fetch_env!(:my_app, :mailgun_domain),
    key: Application.fetch_env!(:my_app, :mailgun_key)
  ]

  @from "[email protected]"

  def send_test_mail(email) do
    {:ok, _} = send_email [