[VCTP] - The Virtual Clock Test Pattern
By: Paolo Perrotta
This paper describes a common example of a Responder called Virtual Clock[VCTP]. The author uses a The Virtual Clock Test Pattern as a Decorator[GOF] for the real system clock that allows the time to be "frozen" or resumed but one could use a Hard-coded Test Stub or a Configurable Test Stub just as easily for most tests. Paolo Perrotta summarizes:
We can have a hard time unit-testing code that depends on the system clock. This paper describes both the problem and a common, reusable solution.
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