# encoding: utf-8

require 'spec_helper'

describe Optimizer::Algebra::Rename::EmptyOperand, '#optimize' do
  subject { object.optimize }

  let(:operand)  { Relation::Empty.new([[:id, Integer]]) }
  let(:relation) { operand.rename(id: :other_id)         }
  let(:object)   { described_class.new(relation)         }

  before do
    expect(object).to be_optimizable
  end

  it { should be_kind_of(Relation::Empty) }

  its(:header) { should be(relation.header) }
end