Implement tests for GameRegistry

apps/amethyst/lib/api/game.ex

@@ -36,21 +36,23 @@ defmodule Amethyst.API.Game do
           Amethyst.GameRegistry.register(__MODULE__, unquote(meta))
           Process.sleep(:infinity)
         end
-        def start(state) do
-          loop(state)
     end
-        defp loop(state) do
+  end
+
+  @spec start(Amethyst.API.Game, term()) :: no_return()
+  def start(mod, state) do
+    loop(mod, state)
+  end
+  defp loop(mod, state) do
     receive do
       {:login, caller, cfg} ->
-              case login(caller, cfg, state) do
+        case mod.login(caller, cfg, state) do
           {:ok, state} ->
             send(caller, :ok)
-                  loop(state)
+            loop(mod, state)
           {:refuse, state} ->
             send(caller, :refuse)
-                  loop(state)
-              end
-          end
+            loop(mod, state)
         end
     end
   end

apps/amethyst/lib/apps/game_coordinator.ex

@@ -54,7 +54,7 @@ defmodule Amethyst.GameCoordinator do
 
   defp _create(type, games) do
     state = type.instantiate()
-    pid = spawn(type, :start, [state])
+    pid = spawn(Amethyst.API.Game, :start, [type, state])
     games = [{type, pid, []} | games]
     {pid, games}
   end

apps/amethyst/lib/apps/game_registry.ex

@@ -30,10 +30,11 @@ defmodule Amethyst.GameRegistry do
   @impl true
   def handle_call({:register, module, meta}, _, state) do
     if Keyword.get(meta, :default, false) && find_default(state) != nil do
-      {:reply, :error, :default_exists}
-    end
+      {:reply, {:error, :default_exists}, state}
+    else
       {:reply, :ok, [{module, meta} | state]}
     end
+  end
 
   @impl true
   def handle_call({:list}, _, state) do

apps/amethyst/test/game_registry_test.exs

@@ -0,0 +1,33 @@
+defmodule GameRegistryTest do
+  use ExUnit.Case, async: true
+
+  @moduledoc """
+  This module includes tests for Amethyst.GameRegistry
+  """
+
+  test "Register a game" do
+    Amethyst.GameRegistry.register(:fake_game, [:some_meta])
+    assert Amethyst.GameRegistry.list() |> Enum.member?({:fake_game, [:some_meta]})
+  end
+
+  test "Register many games" do
+    Range.new(0, 50) |> Enum.map(fn game ->
+      game = String.to_atom("game#{game}")
+      Amethyst.GameRegistry.register(game, [])
+      game
+    end) |> Enum.map(fn game ->
+      assert Amethyst.GameRegistry.list() |> Enum.member?({game, []})
+    end)
+  end
+
+  test "Register and get default game" do
+    Amethyst.GameRegistry.register(:fake_game, [default: true])
+    assert Amethyst.GameRegistry.get_default() == {:fake_game, [default: true]}
+  end
+
+  test "Fail to register multiple games" do
+    Amethyst.GameRegistry.register(:fake_game, [default: true])
+    assert Amethyst.GameRegistry.register(:other_game, [default: true]) == {:error, :default_exists}
+    assert Amethyst.GameRegistry.get_default() == {:fake_game, [default: true]}
+  end
+end

apps/example_game/lib/example/game.ex

@@ -9,7 +9,7 @@ defmodule Example.Game do
 
   @impl true
   def login(from, cfg, state) do
-    Logger.debug("Player logged in from #{inspect(from)}: #{inspect(cfg)}")
+    Logger.info("Player logged in from #{inspect(from)}: #{inspect(cfg)}")
     {:ok, state}
   end
 end

apps/example_game/test/test_helper.exs

@@ -1 +0,0 @@
-ExUnit.start()