Extracts modules for different sections of the UI

test/display/intro_test.exs

@@ -0,0 +1,13 @@
+defmodule IntroTest do
+  use ExUnit.Case
+
+  alias Display.Intro
+
+  test "module not visited yet" do
+    assert Intro.intro(SampleKoan, []) == "\e[32mThere is something\n\n\e[0m"
+  end
+
+  test "module has been visited" do
+    assert Intro.intro(SampleKoan, [SampleKoan]) == ""
+  end
+end