use consistent relative require for test/helper

test/helper.rb

@@ -1,4 +1,4 @@
-rootdir = File.dirname(File.dirname(__FILE__))
+rootdir = File.expand_path('../../lib', __FILE__)
 $LOAD_PATH.unshift "#{rootdir}/lib"
 
 require 'test/unit'

test/suite.rb

@@ -1,4 +1,5 @@
+require File.expand_path('../helper', __FILE__)
 require 'test/unit'
 
-Dir["#{File.dirname(__FILE__)}/test_*.rb"].
+Dir[File.expand_path('../test_*.rb', __FILE__)].
 each { |file| require file }

test/test_basics.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoBasicTests < Test::Unit::TestCase
   def test_rocco_exists_and_is_instancable

test/test_block_comments.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoBlockCommentTest < Test::Unit::TestCase
   def test_basics

test/test_comment_normalization.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoCommentNormalization < Test::Unit::TestCase
   def test_normal_comments

test/test_commentchar_detection.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoAutomaticCommentChars < Test::Unit::TestCase
   def test_basic_detection

test/test_descriptive_section_names.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoDescriptiveSectionNamesTests < Test::Unit::TestCase
   def test_section_name

test/test_language_detection.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoLanguageDetection < Test::Unit::TestCase
   def test_basic_detection

test/test_reported_issues.rb

@@ -1,4 +1,5 @@
-require File.dirname(__FILE__) + '/helper'
+# encoding: utf-8
+require File.expand_path('../helper', __FILE__)
 
 class RoccoIssueTests < Test::Unit::TestCase
     def test_issue07_incorrect_parsing_in_c_mode

test/test_skippable_lines.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoSkippableLines < Test::Unit::TestCase
   def test_shebang_first_line

test/test_source_list.rb

@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/helper'
+require File.expand_path('../helper', __FILE__)
 
 class RoccoSourceListTests < Test::Unit::TestCase
   def test_flat_sourcelist