require "spec_helper"

describe Recommendations::User::Similarity do
  describe "#update similarity" do
    subject {Recommendations::User.new("1")}

    let :ratings do
      {
        "1" => {
          "1" => "5",
          "2" => "4",
          "3" => "3",
          "4" => "2"
        },
        "2" => {
          "1" => "5",
          "2" => "4",
          "3" => "2",
          "4" => "1"
        },
        "3" => {
          "1" => "1",
          "2" => "2",
          "3" => "1",
          "4" => "1"
        },
        "4" => {
          "1" => "4",
          "2" => "3",
          "3" => "2",
          "4" => "1"
        }
      }
    end

    before do
      ratings.each do |user_id, user_ratings|
        user = Recommendations::User.new(user_id)
        user_ratings.each {|item_id, rating| user.rate(item_id, rating)}
      end
    end

    it "update similars" do
      subject.update_similars
      subject.similars.should == %w(2 4 3)
    end
  end
end