require 'spec_helper' describe Relation::Operation::Order, '#each' do subject { object.each { |tuple| yields << tuple } } let(:relation) { Relation.new([ [ :id, Integer ] ], [ [ 1 ], [ 2 ], [ 3 ] ]) } let(:directions) { [ relation[:id].desc ] } let(:object) { described_class.new(relation, directions) } let(:yields) { [] } it_should_behave_like 'an #each method' it 'yields each tuple in order' do expect { subject }.to change { yields.dup }. from([]). to([ [ 3 ], [ 2 ], [ 1 ] ]) end end