Vital Ruby Advanced Lab 1

url_fetcher.rb

require 'open-uri'

class UrlFetcher
  def fetch(url)
    begin
      open(url) { |stream| stream.read }
    rescue SocketError, OpenURI::HTTPError, URI::InvalidURIError, Errno::ENOENT
      nil
    end
  end
end

url_fetcher_spec.rb

require 'rspec/given'
require './url_fetcher'


describe UrlFetcher do
  Given(:fetcher) { UrlFetcher.new }

  context "with not an string" do
    Then { lambda { fetcher.fetch(1337)}.should raise_error }
  end

  context "with good url" do
    Then { fetcher.fetch("http://onestepback.org").should =~ /<html/i }
  end

  context "with bad url path" do
    Then { fetcher.fetch("http://onestepback.org/this_path_does_not_exist").should be_nil }
  end

  context "with bad url host" do
    Then { fetcher.fetch("http://this_host_does_not_exist.com/").should be_nil }
  end

  context "with an ill-formed url" do
    Then { fetcher.fetch("http://no_dot_com").should be_nil }
  end

  context "with an ill-formed protocol" do
    Then { fetcher.fetch("bad_protocol://onestepback.org").should be_nil }
  end

end