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Contents
# encoding: utf-8 require 'spec_helper' describe Algebra::Difference, '#each' do subject { object.each { |tuple| yields << tuple } } let(:object) { described_class.new(left, right) } let(:header) { [ [ :id, Integer ] ] } let(:left) { Relation.new(header, [ [ 1 ] ]) } let(:yields) { [] } context 'with relations having similar bodies' do let(:right) { left.dup } it_should_behave_like 'an #each method' it 'yields no tuples' do subject yields.should be_empty end end context 'with relations having different bodies' do let(:right) { Relation.new(header, [ [ 2 ] ]) } it_should_behave_like 'an #each method' it 'yields only tuples' do subject yields.each { |tuple| tuple.should be_instance_of(Tuple) } end it 'yields only tuples with the expected header' do subject yields.each { |tuple| tuple.header.should be(object.header) } end it 'yields only tuples with the expected data' do expect { subject }.to change { yields.dup }. from([]). to([ [ 1 ] ]) end end end
Version data entries
1 entries across 1 versions & 1 rubygems
Version | Path |
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axiom-0.1.0 | spec/unit/axiom/algebra/difference/each_spec.rb |