# encoding: utf-8 require 'spec_helper' describe Relation::Header, '#rename' do subject { object.rename(aliases) } let(:object) { described_class.coerce([[:id, Integer], [:name, String]], keys: keys) } let(:aliases) { Algebra::Rename::Aliases.coerce(object, id: :other_id) } let(:keys) { Relation::Keys.new([described_class.coerce([[:id, Integer]])]) } it { should be_instance_of(described_class) } it { should_not be(object) } its(:to_ary) { should == [[:other_id, Integer], [:name, String]] } its(:keys) { should eql(Relation::Keys.new([described_class.coerce([[:other_id, Integer]])])) } end