areadme.txt

Do you have a problem making use of a Rails' default migration generation 
logic's inclusion of your test_helper?

  require 'test_helper'

Do you have to replace it with?

  require File.dirname(__FILE__) + '/../test_helper'

Manually? Every time? Annoyed?

Your problem might be using aliases in your test_helper. It seems test_helper 
is loaded twice, and these aliases get into a circular loop. See a workaround 
below.

test_helper_snippet.rb

class Test::Unit::TestCase
  def run_with_some_added_features(*args, &block)
    # added feature code
    run_without_some_added_features(*args, &block)
  end

  unless defined?(TestHelperWasLoadedOnceAlready)
    alias_method_chain :run, :some_added_features
  end
end

class TestHelperWasLoadedOnceAlready
end