modified some tests, added a test runner

test/runner.rb

@@ -0,0 +1,30 @@
+#!/usr/bin/env ruby
+# -*- mode: ruby; coding: utf-8-unix -*- 
+require 'test/unit'
+
+if Test::Unit.methods.include? :setup_argv
+  src_testdir = File.dirname(File.expand_path(__FILE__))
+  srcdir = File.dirname(src_testdir)
+  Test::Unit.setup_argv {|files|
+    if files.empty?
+      [src_testdir]
+    else
+      files.map {|f|
+        if File.exist? "#{src_testdir}/#{f}"
+          "#{src_testdir}/#{f}"
+        elsif File.exist? "#{srcdir}/#{f}"
+          "#{srcdir}/#{f}"
+        elsif File.exist? f
+          f
+        else
+          raise ArgumentError, "not found: #{f}"
+        end
+      }
+    end
+  }
+elsif Test::Unit.constants.include? 'AutoRunner'
+  Test::Unit::AutoRunner.run(true, './')
+else
+  raise Error, 'Test runner not found'
+end
+