Add specs for symbol#casecmp? (#480)
Add specs for symbol#casecmp? (#480)

* Additional test cases for comparing different encodings
nobu/rubyspec,ruby/rubyspec,sgarciac/spec,sgarciac/spec,eregon/rubyspec,eregon/rubyspec,eregon/rubyspec,nobu/rubyspec,sgarciac/spec,ruby/spec,ruby/spec,nobu/rubyspec,ruby/rubyspec,ruby/spec