On Nov 19, 2008, at 3:37 PM, Frederick Cheung wrote:
> On Nov 19, 8:20 pm, Eric LIn <[EMAIL PROTECTED]> wrote:
>> In some of my unit tests, I find the need to set today to a different
>> value than the actual today. For example, to test the model method
>> "balance_of_today", which takes no argument, I want to have
>> Date.today
>> be a specific date for the purpose of testing. In other words, I want
>> to do something like this:
>>
>> mock_today(Date.new(2008, 2, 1)) do
>> ... test code...
>> end
>>
>> My implementation for mock_today is:
>>
>> def mock_today(date)
>> $_mock_test_date = date
>>
>> Date.class_eval do
>> class <<self
>> alias original_today today
>> end
>>
>> def self.today
>> $_mock_test_date
>> end
>> end
>>
>> yield
>>
>> Date.class_eval do
>> class <<self
>> alias today original_today
>> end
>> end
>> end
>>
>> So my questions are:
>>
>> 1) Is it a good idea to mock Date.today?
>>
>> 2) Can my implementation of mock_today be improved? I'm
>> particularly
>> worried about of the use of global variable, and of class_eval, since
>> I heard class_eval is becoming outdated as Ruby 1.9 is coming out.
>
> I occasionally "timetravel" by overriding Time.now (and Date.today
> calls Time.now eventually).
> It goes a little like this
>
> class Time
> cattr_accessor :frozen_now
> self.frozen_now = nil
> class << self
> def now_with_freeze
> if @@frozen_now
> @@frozen_now
> else
> now_without_freeze
> end
> end
> alias_method_chain :now, :freeze
> end
> end
>
> Then you freeze by doing Time.frozen_now = ... and unfreeze by setting
> it back to nil. You could easily refactor this to have a block like
> syntax.
>
> Fred
Or use flexmock:
require 'rubygems'
gem :flexmock
require 'flexmock/test_unit'
# then in your test
stopped_clock = Date.new(2008, 2, 1)
flexmock(Date).should_receive(:today).returns(stopped_clock)
-Rob
Rob Biedenharn http://agileconsultingllc.com
[EMAIL PROTECTED]
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