Spglib test is made by symPoscar.rb. Structure data are in the data directory.
The space group number is written in the last of filename. Cross check is
done by findsym which is available at (http://stokes.byu.edu/isotropy.html).

How to make ruby module for symPoscar.rb.

% ruby extconf.rb --with-getspg-include=../src --with-getspg-lib=../src/.libs
% make  
% export LD_LIBRARY_PATH=directory_containing_libsymspg.so
% export RUBYLIB=current_directory
