Explicitly require helper in test_case

Currently, the helper is required through the Rake test task, which
is very implicit and means when running some tests directly some methods
are not available.

This commit makes the test case always require the helper and remove
the related options from the Rake test task.

Author: st0012

Rakefile

@@ -38,8 +38,6 @@ end
 Rake::TestTask.new(:normal_test) do |t|
   t.verbose = true
   t.deps = :generate
-  t.libs << "test/lib"
-  t.ruby_opts << "-rhelper"
   t.test_files = FileList["test/**/test_*.rb"].exclude("test/rdoc/test_rdoc_rubygems_hook.rb")
 end
 

test/rdoc/support/test_case.rb

@@ -13,6 +13,7 @@
 require 'tmpdir'
 require 'stringio'
 
+require_relative '../../lib/helper'
 require_relative '../../../lib/rdoc'
 
 ##