Add Platform.windows?

lib/grntest/platform.rb

@@ -0,0 +1,24 @@
+# Copyright (C) 2016  Kouhei Sutou <kou@clear-code.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+module Grntest
+  module Platform
+    class << self
+      def windows?
+        /mswin|mingw|cygwin/ === RUBY_PLATFORM
+      end
+    end
+  end
+end

lib/grntest/test-runner.rb

@@ -19,6 +19,7 @@
 
 require "json"
 
+require "grntest/platform"
 require "grntest/error"
 require "grntest/log-parser"
 require "grntest/executors"