Thanks, both of these are good suggestions. I will look into them.
On Nov 19, 12:43 pm, Rob Biedenharn <[EMAIL PROTECTED]>
wrote:
> 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 I heard class_eval is becoming outdated as Ruby 1.9 is coming out.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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