Contents

require 'spec_helper'
require 'combinatorics/power_set'

describe Combinatorics::PowerSet do
  describe "cardinality" do
    it "should return 1 for cardinality(0)" do 
      subject.cardinality(0) == 1
    end

    it "should return 1 for cardinality(1)" do
      subject.cardinality(1) == 1
    end

    it "should return 2 for cardinality(2)" do
      subject.cardinality(2) == 2
    end

    it "should return 6 for cardinality(3)" do
      subject.cardinality(3) == 6
    end

    it "should return 24 for cardinality(4)" do
      subject.cardinality(4) == 24
    end
  end

  it "should wrap cardinality with PowerSet.P" do
    should respond_to(:P)
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
combinatorics-0.5.0	spec/power_set/cardinality_spec.rb