gistfile1.txt

    it "normal" do
      a = [{id: 1, weight:1}, {id:2, weight: 3}, {id:3, weight:nil}]
      check_count = 10
      check_count.times do
        sample_count = 1000
        counts = {1 => 0, 2 => 0}
        sample_count.times do 
          counts[a.sample_with_weight[:id]] += 1
        end
        (counts[1] < counts[2]).should be_true
        (counts[1] + counts[2]).should == sample_count
      end
    end

    it "weightを取る属性名を指定" do
      a = [{id: 1, hoge_weight:1}, {id:2, hoge_weight: 2}]
      check_count = 10
      check_count.times do
        sample_count = 1000
        counts = {1 => 0, 2 => 0}
        sample_count.times do 
          counts[a.sample_with_weight(:hoge_weight)[:id]] += 1
        end
        (counts[1] < counts[2]).should be_true
        (counts[1] + counts[2]).should == sample_count
      end
    end