inject

# File lib/bundler/injector.rb, line 25
    def inject(gemfile_path, lockfile_path)
      if Bundler.frozen_bundle?
        # ensure the lock and Gemfile are synced
        Bundler.definition.ensure_equivalent_gemfile_and_lockfile(true)
      end

      # temporarily unfreeze
      Bundler.settings.temporary(:deployment => false, :frozen => false) do
        # evaluate the Gemfile we have now
        builder = Dsl.new
        builder.eval_gemfile(gemfile_path)

        # don't inject any gems that are already in the Gemfile
        @deps -= builder.dependencies

        # add new deps to the end of the in-memory Gemfile
        # Set conservative versioning to false because
        # we want to let the resolver resolve the version first
        builder.eval_gemfile(INJECTED_GEMS, build_gem_lines(false)) if @deps.any?

        # resolve to see if the new deps broke anything
        @definition = builder.to_definition(lockfile_path, {})
        @definition.resolve_remotely!

        # since nothing broke, we can add those gems to the gemfile
        append_to(gemfile_path, build_gem_lines(@options[:conservative_versioning])) if @deps.any?

        # since we resolved successfully, write out the lockfile
        @definition.lock(Bundler.default_lockfile)

        # invalidate the cached Bundler.definition
        Bundler.reset_paths!

        # return an array of the deps that we added
        @deps
      end
    end