How write test for an Elixir script file (Mix.install)

Questions & Help Questions
2

not sure if this is the best way, but it should work =)

script.exs

defmodule Foo do
  def bar, do: :baz
end

In the same dir put script_test.exs

Code.require_file("script.exs")

ExUnit.start()

defmodule FooTest do
  use ExUnit.Case

  test "bar/0 does :baz" do
    assert :baz == Foo.bar()
  end
end

and run the test with

elixir script_test.exs