# encoding: utf-8 require 'spec_helper' describe Optimizer::Algebra::Rename::LimitOperand, '#optimizable?' do subject { object.optimizable? } let(:base) { Relation.new([ [ :id, Integer ] ], [ [ 1 ] ].each) } let(:aliases) { { :id => :other_id } } let(:relation) { operand.rename(aliases) } let(:object) { described_class.new(relation) } before do object.operation.should be_kind_of(Algebra::Rename) end context 'when the operand is an limit operation' do let(:operand) { base.sort_by { |r| r.id }.take(1) } it { should be(true) } end context 'when the operand is not an limit operation' do let(:operand) { base } it { should be(false) } end end