From: Chris Gallagher <cgallagher@...>
Date: 2006-11-22T00:56:17+09:00
Subject: Ruby unit testing

Hi,

I have a ruby script that I would like to apply unit testing against but 
Ive never actually created any previously and the documentation is not 
bad but im struggling to apply it to my own code.

Could someone give a couple of examples of how unit testing might be 
applied to the following code just to get me started on it.

require 'net/http'
require 'uri'
require 'rexml/document'
require 'rubygems'
require_gem 'activerecord'


include REXML
def fetch(uri_str, limit=10)
  fail 'http redirect too deep' if limit.zero?
  puts "Scraping: #{uri_str}"
  response = Net::HTTP.get_response(URI.parse(uri_str))
  case response
  when Net::HTTPSuccess
    response
  when NetHTTPRedirection
    fetch(response['location'], limit-1)
  else
    response.error!
  end
end

#Connect to the database
ActiveRecord::Base.establish_connection(
  :adapter  => "mysql",
  :username => "root",
  :host     => "localhost",
  :password => "",
  :database => "build"
)

puts "connected to build database"


class Result < ActiveRecord::Base
end

records = Result.find(:all).each do |records|
  response = fetch(records.build_url)


  scraped_data = response.body

  table_start_pos = scraped_data.index('<table class="index" 
width="100%">')
  table_end_pos = scraped_data.index('</table>') + 9
  height = table_end_pos - table_start_pos

  #pick out the table
  gathered_data = response.body[table_start_pos,height]

  #convert Data to REXML
  converted_data = REXML::Document.new gathered_data
  module_name = XPath.first(converted_data, "//td[@class='data']/a/]")
  module_name = module_name

  build_status_since = XPath.first(converted_data, "//td[2]/em")
  build_status_since = build_status_since.text
  build_status_since = build_status_since.slice(/(\d+):(\d+)/)

  last_failure = XPath.first(converted_data, "//tbody/tr/td[3]")
  last_failure = last_failure.text

  last_success = XPath.first(converted_data, "//tbody/tr/td[4]")
  last_success = last_success.text

  build_number = XPath.first(converted_data, "//tbody/tr/td[5]")
  build_number = build_number.text

-----------------

I know that I need to include:

require 'test/unit'
require '../name_of_code_tested'

after that though it gets less clear :(

any ideas?

cheers.

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