Adds module to parse arguments passed to mediate

test/options_test.exs

@@ -0,0 +1,18 @@
+defmodule OptionTest do
+  use ExUnit.Case, async: true
+
+  test "has default options" do
+    options = Options.parse([])
+    refute Map.fetch!(options, :clear_screen)
+  end
+
+  test "override clearing of screen" do
+    options = Options.parse(["--clear-screen"])
+    assert Map.fetch!(options, :clear_screen)
+  end
+
+  test "ignores unknown options" do
+    options = Options.parse(["--foo"])
+    refute Map.fetch!(options, :clear_screen)
+  end
+end