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Contents
require 'spec_helper'
module Alf
module Operator::Relational
describe Minus do
let(:operator_class){ Minus }
it_should_behave_like("An operator class")
let(:left) {[
{:sid => 'S1', :city => 'London'},
{:sid => 'S2', :city => 'Paris'},
{:sid => 'S3', :city => 'Paris'}
]}
let(:right) {[
{:sid => 'S2', :city => 'Paris'},
{:sid => 'S1', :city => 'London'},
]}
let(:disjoint) {[
{:sid => 'S4', :city => 'Oslo'},
{:sid => 'S5', :city => 'Bruxelles'},
]}
let(:operator){ Lispy.minus(*args) }
subject{ operator.to_a }
context "when applied on the same operand twice" do
let(:args){ [left, left] }
it { should be_empty }
end
context "when applied on operands sharing tuples" do
let(:args){ [left, right] }
let(:expected) {[
{:sid => 'S3', :city => 'Paris'}
]}
it { should eq(expected) }
end
context "when applied on disjoint operands" do
let(:args){ [left, disjoint] }
it { should eq(left) }
end
context "when factored with Lispy" do
let(:operator){ Lispy.minus(left, right) }
let(:expected) {[
{:sid => 'S3', :city => 'Paris'}
]}
it { should eq(expected) }
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems