diff --git a/tool/lib/test/unit/parallel.rb b/tool/lib/test/unit/parallel.rb
index d851326aca..730d7a7f3d 100644
--- a/tool/lib/test/unit/parallel.rb
+++ b/tool/lib/test/unit/parallel.rb
@@ -198,11 +198,5 @@ if $0 == __FILE__
     end
   end
   require 'rubygems'
-  module Gem # :nodoc:
-  end
-  class Gem::TestCase < MiniTest::Unit::TestCase # :nodoc:
-    @@project_dir = File.expand_path('../../../../..', __FILE__)
-  end
-
   Test::Unit::Worker.new.run(ARGV)
 end
diff --git a/tool/test/runner.rb b/tool/test/runner.rb
index 20ae9aa1a3..f8769857ad 100644
--- a/tool/test/runner.rb
+++ b/tool/test/runner.rb
@@ -24,12 +24,6 @@ Dir.glob("#{src_testdir}/../gems/*/*.gemspec")
 
 require 'test/unit'
 
-module Gem
-end
-class Gem::TestCase < MiniTest::Unit::TestCase
-  @@project_dir = File.dirname($LOAD_PATH.last)
-end
-
 ENV["GEM_SKIP"] = ENV["GEM_HOME"] = ENV["GEM_PATH"] = "".freeze
 
 require_relative "#{tool_dir}/lib/profile_test_all" if ENV.has_key?('RUBY_TEST_ALL_PROFILE')