test that any configured config_module is called at startup

lib/goth/config.ex

@@ -36,7 +36,9 @@ defmodule Goth.Config do
   # and pass it along to each config function
 
   def init(:ok) do
-    {:ok, dynamic_config} = config_mod_init(Application.get_all_env(:goth))
+    {:ok, dynamic_config} =
+      Application.get_all_env(:goth)
+      |> config_mod_init
 
     config = from_json(dynamic_config) ||
              from_config(dynamic_config) ||
@@ -52,8 +54,7 @@ defmodule Goth.Config do
     {:ok, config}
   end
 
-  # this requires
-  def config_mod_init(config) do
+  defp config_mod_init(config) do
     case Keyword.get(config, :config_module) do
       nil -> {:ok, config}
       mod ->

mix.exs

@@ -6,6 +6,7 @@ defmodule Goth.Mixfile do
      version: "0.7.2",
      description: description(),
      package: package(),
+     elixirc_paths: elixirc_paths(Mix.env),
      elixir: "~> 1.4",
      deps: deps()]
   end
@@ -17,6 +18,9 @@ defmodule Goth.Mixfile do
     ]
   end
 
+  defp elixirc_paths(:test), do: ["lib", "test/support"]
+  defp elixirc_paths(_), do: ["lib"]
+
   defp deps do
     [{:json_web_token, "~> 0.2.10"},
      {:httpoison, "~> 0.11"},

test/goth/config_test.exs

@@ -149,4 +149,16 @@ defmodule Goth.ConfigTest do
     Application.stop(:goth)
     Application.start(:goth)
   end
+
+  test "the config_module is allowed to override config" do
+    Application.put_env(:goth, :config_module, Goth.TestConfigMod)
+    Application.stop(:goth)
+
+    Application.start(:goth)
+    assert {:ok, :val} == Goth.Config.get(:actor_email)
+
+    Application.delete_env(:goth, :config_module)
+    Application.stop(:goth)
+    Application.start(:goth)
+  end
 end

test/support/test_config_mod.ex

@@ -0,0 +1,7 @@
+defmodule Goth.TestConfigMod do
+  use Goth.Config
+
+  def init(config) do
+    {:ok, Keyword.put(config, :actor_email, :val)}
+  end
+end