    # File lib/fog/aws/requests/iam/remove_user_from_group.rb, line 35
            def remove_user_from_group(group_name, user_name)
              if data[:groups].has_key? group_name
                if data[:users].has_key? user_name
                  data[:groups][group_name][:members].delete_if { |item| item == user_name }
                  Excon::Response.new.tap do |response|
                    response.status = 200
                    response.body = { 'RequestId' => Fog::AWS::Mock.request_id }
                  end
                else
                  raise Fog::AWS::IAM::NotFound.new("The user with name #{user_name} cannot be found.")
                end
              else
                raise Fog::AWS::IAM::NotFound.new("The group with name #{group_name} cannot be found.")
              end
            end