# encoding: utf-8 require 'spec_helper' describe Algebra::Join, '.new' do subject { object.new(left, right) } let(:header) { [[:id, Integer]] } let(:left) { Relation.new(header, [[1], [2]]) } let(:object) { described_class } context 'with relations having headers with common attributes' do let(:right) { Relation.new([[:id, Integer], [:name, String]], [[2, 'Dan Kubb']]) } it { should be_instance_of(object) } end context 'with relations having equivalent headers' do let(:right) { left.dup } it { should be_instance_of(object) } end context 'with relations having different headers' do let(:right) { Relation.new([[:name, String]], [['Dan Kubb']]) } it { should be_instance_of(object) } end end