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# encoding: utf-8 require 'spec_helper' describe Algebra::Projection, '#each' do subject { object.each { |tuple| yields << tuple } } let(:object) { described_class.new(relation, [ :id ]) } let(:relation) { Relation.new([ [ :id, Integer ], [ :name, String ] ], body) } let(:body) { [ [ 1, 'Dan Kubb' ], [ 2, 'Dan Kubb' ], [ 2, 'Alex Kubb'] ] } let(:yields) { [] } 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 ], [ 2 ] ]) 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/projection/each_spec.rb |