Add spec for Date#friday?
Add spec for Date#friday?

ruby/spec,ruby/rubyspec,eregon/rubyspec,nobu/rubyspec,sgarciac/spec,ruby/spec,eregon/rubyspec,nobu/rubyspec,sgarciac/spec,nobu/rubyspec,ruby/rubyspec,eregon/rubyspec,sgarciac/spec,ruby/spec