# encoding: utf-8 require 'spec_helper' describe Optimizer::Algebra::Rename, '#aliases' do subject { object.aliases } let(:attribute) { Attribute::Integer.new(:id) } let(:header) { Relation::Header.new([attribute]) } let(:base) { Relation.new(header, LazyEnumerable.new([[1]])) } let(:aliases) { { id: :other_id } } let(:object) { described_class.new(relation) } before do expect(object.operation).to be_kind_of(Algebra::Rename) end let(:relation) { base.rename(aliases) } it { should be_kind_of(Algebra::Rename::Aliases) } it { should be(relation.aliases) } end