# 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) { { id: :other_id }                                                     }
  let(:keys)    { Relation::Keys.new([described_class.coerce([[:id, Integer]])])        }

  context 'with aliases' do
    let(:aliases) { Algebra::Rename::Aliases.coerce(object, super()) }

    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

  context 'with a Hash' do
    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
end