Idea for mock syntax

gistfile1.ex

defmodule MyTest do
  use ExUnit.Case
  import Mock

  test_with_mock "test_name", HTTPotion,
    do
        new(buck, key, value, _), do: Object[key: {buck, key}, value: value]
        get_update_metadata(Object[indexes: indexes]), do: indexes
    end

    HTTPotion.get("http://example.com")
    assert called HTTPotion.get("http://example.com")
  end
end