call_test.rb

require 'rubygems'
require 'test/unit'

class Call
  attr_accessor :company
  def initialize(opts = {})
    @company = opts[:company]
    raise Call::NoCompanyException unless @company
  end

  private

  def company
    @company
    Redis.fetch(company.id, :name)
  end

  class NoCompanyException < Exception
  end
end

class CallTest < Test::Unit::TestCase
  def test_call_has_a_company
    c = Call.new(:company => "my company")
    assert_equal "my company", c.company

    c = Call.new()
    Redis.stubs(:fetch).with(c.id).returns("my comapny")
    c.company

  end

  def test_call_must_have_a_company
    assert_raise Call::NoCompanyException do
      c = Call.new()
    end
  end
end