Using dummy objects

In movies, sometimes a double doesn't perform anything; they just appear on the screen. One such instance would be standing in a crowded place where the real actor cannot go, such as watching a soccer match or tennis match. It will be very risky for the real actor to go to a full house, but the movie's script needs it.

Likewise, a dummy object is passed as a mandatory parameter object. A dummy object is not directly used in the test or code under test, but it is required for the creation of another object required in the code under test. Dummy objects are analogous to null objects, but a dummy object is not used by the code under test. Null objects (as in the pattern) are used in the code under test and are actively interacted ...

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