Extracts modules for different sections of the UI

test/display/progress_bar_test.exs

@@ -0,0 +1,21 @@
+defmodule ProgressBarTest do
+  use ExUnit.Case
+
+  alias Display.ProgressBar
+
+  test "empty bar" do
+    bar = ProgressBar.progress_bar(%{total: 12, current: 0})
+    assert bar == "|                              | 0 of 12"
+  end
+
+  test "puts counter on the right until half the koans are complete" do
+    bar = ProgressBar.progress_bar(%{total: 12, current: 3})
+    assert bar == "|=======>                      | 3 of 12"
+  end
+
+
+  test "full bar" do
+    bar = ProgressBar.progress_bar(%{total: 12, current: 12})
+    assert bar == "|=============================>| 12 of 12"
+  end
+end