Create a test file for each of the koan modules

test/koans/functions_koans_test.exs

@@ -0,0 +1,22 @@
+defmodule FunctionsTests do
+  use ExUnit.Case
+  use TestHarness
+
+  test "Functions" do
+    answers = [
+      "Hello, World!",
+      3,
+      {:multiple, ["One and Two", "Only One"]},
+      {:multiple, ["Hello Hello Hello Hello Hello ","Hello Hello "]},
+      {:multiple, [:entire_list, :single_thing]},
+      {:multiple, ["10 is bigger than 5", "4 is not bigger than 27"]},
+      {:multiple, ["It was zero", "The length was 5"]},
+      6,
+      6,
+      100,
+      "Full Name"
+    ]
+
+    test_all(Functions, answers)
+  end
+end