# File lib/librarian/mock/source/mock/registry.rb, line 23
              def spec(name, version = nil, &block)
                @source[name] ||= []
                unless version
                  Spec.new(@source[name]).instance_eval(&block) if block
                else
                  Spec.new(@source[name]).version(version, &block)
                end
                @source[name] = @source[name].sort_by{|a| Manifest::Version.new(a[:version])}.reverse
              end