Link Watch

link_watch.rb

require 'open-uri'

class LinkWatch
  def initialize(url, link, keyword)
    @url = url
    @link = link
    @keyword = keyword
  end

  def is_ok?
    @is_ok ||= begin
      uri = URI.parse(@url)
      body = uri.read
      !!(body =~ /\<a.+href\=\".*#{@link}.*\".*#{@keyword}.*<\/a\>/)
    end
  end
end

# Tests
describe LinkWatch do
  context "existing links" do
    context "and existing keyword" do
      it "should go well with Enaldi" do
        LinkWatch.new("http://enaldi.wordpress.com", "camaloon.com", "Chapas personalizadas").is_ok?.should == true
      end

      it "should go wrong with Enaldi" do
        LinkWatch.new("http://www.milloringlix.org/", "camaloon.com", "xapes personalitzades").is_ok?.should == true
      end
    end

    context "and non-existing keyword" do
      it "should go wrong with Enaldi" do
        LinkWatch.new("http://enaldi.wordpress.com", "camaloon.com", "Imanes personalizados").is_ok?.should == false
      end

      it "should go wrong with Milloringlix" do
        LinkWatch.new("http://www.milloringlix.org/", "camaloon.com", "Chapas personalizadas").is_ok?.should == false
      end
    end
  end

  context "non-existing links" do
    it "should go wrong with Google" do
      LinkWatch.new("http://google.es", "camaloon.com", "").is_ok?.should == false
    end

    it "should go wrong with Itnig" do
      LinkWatch.new("http://google.es", "camaloon.com", "").is_ok?.should == false
    end

    it "should go wrong with Twitter" do
      LinkWatch.new("http://google.es", "camaloon.com", "").is_ok?.should == false
    end
  end
end