Contents

require 'spec_helper'
require 'combinatorics/choose'

shared_examples_for "Choose::Mixin" do
  let(:empty_set) { Set[] }

  it "should return [[]] for [].choose(0).to_a" do
    set     = subject[]
    results = set.choose(0).to_a

    expect(results).to eq([empty_set])
  end

  it "should return [[]] for [1].choose(0).to_a" do
    set     = subject[1]
    results = set.choose(0).to_a
    
    expect(results).to eq([empty_set])
  end

  it "should return [[1]] for [1].choose(1).to_a" do
    set     = subject[1]
    results = set.choose(1).to_a
    
    expect(results).to eq([Set[1]])
  end

  it "should return [[1], [2]] for [1, 2].choose(1).to_a" do
    set     = subject[1, 2]
    results = set.choose(1).to_a
    
    expect(results).to match_array([Set[1], Set[2]])
  end

  it "should return [[1, 2]] for [1, 2].choose(2).to_a" do
    set     = subject[1, 2]
    results = set.choose(2).to_a
    
    expect(results).to eq([Set[1, 2]])
  end

  it "should filter out repeated elements" do
    set1 = subject[1,1,2,3]
    set2 = subject[1,2,3]

    expect(set1.choose(2).to_a).to eq(set2.choose(2).to_a)
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
combinatorics-0.5.0	spec/choose/mixin_examples.rb
combinatorics-0.4.4	spec/choose/mixin_examples.rb