From: Steve Klabnik <steve@...>
Date: 2011-03-03T22:42:13+09:00
Subject: Re: How to stop a file from being required

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The only place this gets tricky is if you load a file from two different
paths. So, a test_helper.rb for example

$ ls
test_helper.rb
some_test.rb
foo
|
 `foo_test.rb

In some_test:

require 'test_helper'

in foo_test

require '../test_helper'

Now it'll load the test_helper twice, because those two strings are
different. The solution:

require "File.expand_path(test_helper)"

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