Extracts modules for different sections of the UI

test/display/notification_test.exs

@@ -0,0 +1,9 @@
+defmodule NotificationTest do
+  use ExUnit.Case
+  alias Display.Notifications
+
+  test "shows possible koans when a koan can not be found" do
+    message  = Notifications.invalid_koan(SampleKoan, [PassingKoan])
+    assert message == "Did not find koan SampleKoan in \e[31mPassingKoan\e[0m"
+  end
+end