Use test-unit and CoreAssertions instead of deep copy from ruby core repository.

Author: hsbt

Rakefile

@@ -2,9 +2,16 @@ require "bundler/gem_tasks"
 require "rake/testtask"
 
 Rake::TestTask.new(:test) do |t|
- t.libs << "test" << "test/lib"
- t.libs << "lib"
- t.test_files = FileList['test/**/test_*.rb']
+ t.libs << "test/lib"
+ t.ruby_opts << "-rhelper"
+ t.test_files = FileList["test/**/test_*.rb"]
 end
 
-task :default => [:test]
+task :sync_tool do
+ require 'fileutils'
+ FileUtils.cp "../ruby/tool/lib/test/unit/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