Extracts modules for different sections of the UI

test/display/failure_test.exs

@@ -0,0 +1,24 @@
+defmodule FailureTests do
+  use ExUnit.Case
+  alias Display.Failure
+
+  test "assertion failure with proper expression" do
+    error = error(%ExUnit.AssertionError{expr: "hi"})
+
+   assert Failure.format_failure(error) == "\e[36mAssertion failed in some_file.ex:42\e[0m\n\e[31m\"hi\"\e[0m\n"
+  end
+
+  test "assertion failure with message" do
+    error = error(%ExUnit.AssertionError{expr: :ex_unit_no_meaningful_value, message: "hola"})
+
+   assert Failure.format_failure(error) == "\e[36mAssertion failed in some_file.ex:42\e[0m\n\e[31mhola\e[0m\n"
+  end
+
+  defp error(error) do
+    %{
+      error: error,
+      file: "some_file.ex",
+      line:  42
+    }
+  end
+end

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

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

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