From: Jim Weirich <jim@...>
Date: 2006-05-25T02:01:21+09:00
Subject: Re: Overriding Time.now

Molitor, Stephen L wrote:
>> I believe that you can redefine Time.now in the scope where you need
>> it without interfering with Test::Unit
> 
> There's only one instance of the Time class object, and any changes you 
> make to it are in effect 'global'. 

You can use a technique called "Constant Injection" where you 
temporarily change the definition of a constant within the scope of a 
single class.

See http://onestepback.org/articles/depinj/classesarejustobjects.html 
for an example.

This allows you to say something like:

   def test_my_class
     MyClass.use_class(:Time, MockTime) do
       mc = MyClass.new
       # Any calls to Time.now within MyClass will be routed to 
MockTime.now
     end
     # Calls to Time.now are now back to normal.
   end

-- Jim Weirich

-- 
Posted via http://www.ruby-forum.com/.