zone_finder.rb

require 'open-uri'
require 'fastercsv'

class ZoneFinder
  
  # Creates a ZoneFinder object
  def initialize(network_data_path)
    @network_data_path = network_data_path
  end
  
  # Returns the network data parsed from a csv file as an array of 
  # FasterCSV rows.
  def fetch_network_data
    return FasterCSV.parse(
      open(@network_data_path).read.gsub('"', '\''),
      :headers => true
    )
  end
    
end

zone_finder_spec.rb

describe ZoneFinder, "#fetch_network_data" do
  
  before(:each) do
    @network_data_path = mock('network data path')
    @network_data_handle = mock('network data handle')
    @network_data_csv = mock('network data csv')
    @network_data = mock('network data')
    
    @network_data_handle.stub!(:read).and_return(@network_data_csv)
    @network_data_csv.stub!(:gsub).and_return(@network_data_csv)
    
    FasterCSV.stub!(:parse).and_return(@network_data)
    
    @zone_finder = ZoneFinder.new(@network_data_path)
    
    @zone_finder.stub!(:open).and_return(@network_data_handle)
  end
  
  it "should attempt to open the file located at the network_data_path" do
    @zone_finder.should_receive(
      :open
    ).with(
      @network_data_path
    ).and_return(
      @network_data_handle
    )
    
    @zone_finder.fetch_network_data
  end
  
  it "should read the data from the network data file" do
    @network_data_handle.should_receive(:read).and_return(@network_data_csv)
    
    @zone_finder.fetch_network_data
  end

  it "should replace double quotes with single quotes in the returned csv " +
    "document" do
    @network_data_csv.should_receive(
      :gsub
    ).with(
      '"', "'"
    ).and_return(
      @network_data_csv
    )
    
    @zone_finder.send(:fetch_network_data)
  end
  
  it "should parse the returned csv document and return it" do
    FasterCSV.should_receive(
      :parse
    ).with(
      @network_data_csv, :headers => true
    ).and_return(
      @network_data
    )
    
    @zone_finder.send(:fetch_network_data).should == @network_data
  end
  
end