From: Sean Ross <seandavidross@...>
Date: 2005-06-28T05:50:40+09:00
Subject: Re: unit testing singletons

"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'
#