spec: covered String#swapcase!
spec: covered String#swapcase!
ruby/rubyspec,nobu/rubyspec,eregon/rubyspec,nobu/rubyspec,nobu/rubyspec,ruby/spec,ruby/spec,sgarciac/spec,eregon/rubyspec,sgarciac/spec,ruby/rubyspec,ruby/spec,eregon/rubyspec,sgarciac/spec