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.