Edge case

Common card · No. 436724

An edge case is a problem or situation that occurs only at an extreme (maximum or minimum) operating parameter. For example, a stereo speaker might noticeably distort the audio when played at maximum volume, even in the absence of any other extreme settings or conditions. An edge case can be expected or unexpected. In engineering, planning for and gracefully addressing edge cases can be a significant task, yet it may be overlooked or underestimated. Some common causes of edge cases are: Unpredictable user behavior Evolution of use cases (e.g., user behavior may change over time) Limited test coverage Product complexity (for instance, in distributed systems or microservice architectures) Resource limitations (e.g. limited processing power, computer memory, or computer storage) Other external causes Some basic examples of edge cases include: A long username in an app overflows and displays incorrectly A booking system does not handle reservations correctly on a leap day (February 29) Non...

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