add mrbgem test runner

.gitignore

@@ -2,3 +2,4 @@ gem_*
 gem-*
 mrb-*.a
 src/*.o
+/tmp

run_test.rb

@@ -0,0 +1,33 @@
+#!/usr/bin/env ruby
+#
+# mrbgems test runner
+#
+
+DEPEND_GEMS = []
+gemname = File.basename(File.dirname(File.expand_path __FILE__))
+
+if __FILE__ == $0
+  repository, dir = 'https://github.com/mruby/mruby.git', 'tmp/mruby'
+  build_args = ARGV
+  if ARGV.first && ARGV.first.include?('iij')
+    repository, dir = 'https://github.com/iij/mruby.git', 'tmp/iij-mruby'
+    build_args = ARGV[1, ARGV.size]
+  end
+  build_args = ['all', 'test']  if build_args.nil? or build_args.empty?
+
+  Dir.mkdir 'tmp'  unless File.exist?('tmp')
+  unless File.exist?(dir)
+    system "git clone #{repository} #{dir}"
+  end
+
+  exit system(%Q[cd #{dir}; MRUBY_CONFIG=#{File.expand_path __FILE__} ruby minirake #{build_args.join(' ')}])
+end
+
+MRuby::Build.new do |conf|
+  toolchain :gcc
+  conf.gems.clear
+  conf.gem File.expand_path(File.dirname(__FILE__))
+  DEPEND_GEMS.each do |g|
+    conf.gem g
+  end
+end