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An implicit test oracle relies on implied information and assumptions.<ref name="Oracle survey"/>{{rp|518}} For example, there may be some implied conclusion from a program crash, i.e. unwanted behavior - an oracle to determine that there may be a problem. There are a number of ways to search and test for unwanted behavior, whether some call it negative testing, where there are specialized subsets such as [[fuzzing]].
There are limitations in implicit test oracles - as they rely on implied conclusions and assumptions. For example, a program or process crash may not be a priority issue if the system is a fault-tolerant system and so operating under a form of self-healing/[[self-management (computer science)|self-management]]. Implicit test oracles may be susceptible to false positives due to environment dependencies. Property based testing relies on implicit oracles.
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