Use test-unit-ruby-core gem

Author: hsbt

Gemfile

@@ -4,4 +4,5 @@ gemspec
 
 gem "rake"
 gem "test-unit"
+gem "test-unit-ruby-core"
 gem "webrick"

Rakefile

@@ -7,11 +7,4 @@ Rake::TestTask.new(:test) do |t|
   t.test_files = FileList["test/**/test_*.rb"]
 end
 
-task :sync_tool do
-  require 'fileutils'
-  FileUtils.cp "../ruby/tool/lib/core_assertions.rb", "./test/lib"
-  FileUtils.cp "../ruby/tool/lib/envutil.rb", "./test/lib"
-  FileUtils.cp "../ruby/tool/lib/find_executable.rb", "./test/lib"
-end
-
 task :default => :test