Rails - Feb 2010 - How to stub out a library file

Hi all,

I encounter a problem when i''m stubing out a library file.
The rails version is 2.3.4.

[How to reproduce]
1. Create a file payment_gateway.rb in subdirectory lib/.
[code]
class PaymentGateway
  def self.collect
    p ''lib/payment_gateway''
    true
  end
end

2. Create a file payment_gateway.rb in subdirectory test/mocks/test.
[code]
require ''lib/util/payment_gateway''

class PaymentGateway
  def self.collect
    p ''mock/payment_gateway''
    false
  end
end

3. Create a method in any unit test file to test this method.

The actual result is invoking the method in the mock file, and the
output is
''mock/payment_gateway''
false

But if i add the following code in the application_controller.rb
[code]
require ''util/payment_gateway''

The actual result is invoking the method in the lib file, and the output
is
''lib/payment_gateway''
true

I don''t know why is that, could anyone give me some help?

Thanks very much.
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