# File lib/fog/aws/requests/auto_scaling/set_desired_capacity.rb, line 69
        def set_desired_capacity(auto_scaling_group_name, desired_capacity, options = {})
          unless self.data[:auto_scaling_groups].has_key?(auto_scaling_group_name)
            Fog::AWS::AutoScaling::ValidationError.new('AutoScalingGroup name not found - null')
          end
          self.data[:auto_scaling_groups][auto_scaling_group_name]['DesiredCapacity'] = desired_capacity

          response = Excon::Response.new
          response.status = 200
          response.body = {
            'ResponseMetadata' => { 'RequestId' => Fog::AWS::Mock.request_id }
          }
          response
        end