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  • Christopher Bennage thinks this is interesting:

A test harnesses differs from mock objects, in that a mock object can be trained to produce behavior that conforms only to the defined interface. A test harnesses runs as a separate server, so it is not obliged to conform to any interface. It can provoke network errors, protocol errors, or application-level errors. If all low-level errors were guaranteed to be recognized, caught, and thrown as the right type of exception, there would be no need for test harnesses


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This is really fault injection such as Chris Monkey.