[lnkForumImage]
TotalShareware - Download Free Software
Confronta i prezzi di migliaia di prodotti.
Asp Forum
 Home | Login | Register | Search 


 

Forums >

comp.lang.ruby

unit testing singletons

Joe Van Dyk

6/27/2005 6:07:00 PM

Hi,

How can I properly unit test a singleton? I want to reinitialize it
on every test method, but since it seems to stick around in memory, I
can't seem to ever create a new singleton object.

Thanks,
Joe
3 Answers

Gennady

6/27/2005 6:37:00 PM

0

Joe Van Dyk wrote:
> Hi,
>
> How can I properly unit test a singleton? I want to reinitialize it
> on every test method, but since it seems to stick around in memory, I
> can't seem to ever create a new singleton object.
>
> Thanks,
> Joe
>
In extremely rear case when I need a singleton nowadays, I usually end
up with 2 classes: one is a "normal" class that can be tested and
anything and another that is the actual singleton to be used in the
application that delegates all missing methods to the first one or
simply inherits from it.

Gennady.

Sean Ross

6/27/2005 8:45:00 PM

0

"Joe Van Dyk" <joevandyk@gmail.com> wrote in message
news:c715e640506271106cf2347c@mail.gmail.com...
Hi,

How can I properly unit test a singleton? I want to reinitialize it
on every test method, but since it seems to stick around in memory, I
can't seem to ever create a new singleton object.

Thanks,
Joe



Is this what you're looking for?

require 'singleton'

class YourSingleton
attr_accessor :data
include Singleton
end

def YourSingleton.instance_for_testing
@__instance__ = new
end

s = YourSingleton.instance
s.data = 1
puts "s.data=>'#{s.data}'"

# reinitialize instance
t = YourSingleton.instance_for_testing
t.data = 2
puts "t.data=>'#{t.data}'"

w = YourSingleton.instance
puts "w.data=>'#{w.data}'"

# old instance
puts "s.data=>'#{s.data}'"


# output:
#
# s.data=>'1'
# t.data=>'2'
# w.data=>'2'
# s.data=>'1'
#

Joe Van Dyk

6/27/2005 10:50:00 PM

0

On 6/27/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> Hi,
>
> How can I properly unit test a singleton? I want to reinitialize it
> on every test method, but since it seems to stick around in memory, I
> can't seem to ever create a new singleton object.

Thanks for the responses. I ended up making it not a Singleton object. :-)

Joe