stub_rubygems

# File lib/bundler/rubygems_integration.rb, line 626
      def stub_rubygems(specs)
        # RubyGems versions lower than 1.7 use SourceIndex#from_gems_in
        source_index_class = (class << Gem::SourceIndex; self; end)
        redefine_method(source_index_class, :from_gems_in) do |*args|
          Gem::SourceIndex.new.tap do |source_index|
            source_index.spec_dirs = *args
            source_index.add_specs(*specs)
          end
        end
      end