# encoding: utf-8 require 'spec_helper' describe Algebra::Rename, '#header' do subject { object.header } let(:relation) { Relation.new([[:id, Integer]], [[1]]) } let(:object) { described_class.new(relation, id: :other_id) } it_should_behave_like 'an idempotent method' it { should be_instance_of(Relation::Header) } it { should == [[:other_id, Integer]] } end