Array Intersection RubyGames

integer_math.rb

class IntegerMath
  def self.intersection(array_1, array_2)
    array_1 & array_2
  end
end

integer_math_spec.rb

require 'rubygems'
require 'rspec'
if RUBY_VERSION == "1.9.1"
  require 'spec/autorun'
end
require 'benchmark'
require File.join(File.dirname(__FILE__),'integer_math')

describe IntegerMath do
  before(:all) do
    @array_1 = Array.new(100000).collect{rand(10000000)}.uniq
    @array_2 = Array.new(100000).collect{rand(10000000)}.uniq
    @reports = []
    @reports << Benchmark.measure do
      @correct_answer = (@array_1 & @array_2)
    end
    @reports << Benchmark.measure do
      @my_answer = IntegerMath.intersection(@array_1, @array_2)
    end
  end

  after(:all) do
    puts ''
    @reports.each{|r| puts r}
  end

  it "should have correct legth" do
    @correct_answer.length.should == @my_answer.length
  end

  it "should have the correct elements" do
    @correct_answer.sort.should == @my_answer.sort
  end
end

test_integer_math.rb

require 'minitest/autorun'
require 'benchmark'
require File.join(File.dirname(__FILE__),'integer_math')

class TestIntegerMath < MiniTest::Unit::TestCase
  def setup
    @array_1 = Array.new(100000).collect{rand(10000000)}.uniq
    @array_2 = Array.new(100000).collect{rand(10000000)}.uniq
    @reports = []
    @reports << Benchmark.measure do
      @correct_answer = (@array_1 & @array_2)
    end
    @reports << Benchmark.measure do
      @my_answer = IntegerMath.intersection(@array_1, @array_2)
    end
  end

  def teardown
    @reports.each{|r| puts r}
  end

  def test_intersection_answer_length
    assert_equal @correct_answer.length, @my_answer.length
    puts ''
  end

  def test_intersection_answer_elements
    assert_equal @correct_answer.sort, @my_answer.sort
    puts ''
  end
end