test/ruby/test_complex.rb: Add test for CMath.log2
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50711 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test/ruby/test_complex.rb: Add test for CMath.log2
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50711 b2dd03c8-39d4-4d8f-98ff-823fe69b080e