Monkey testing

In software testing, monkey testing is a technique where the user tests the application or system by providing random inputs and checking the behavior, or seeing whether the application or system will crash. Monkey testing is usually implemented as random, automated unit tests.

While the source of the name "monkey" is uncertain, it is believed by some that the name has to do with the infinite monkey theorem, which states that a monkey hitting keys at random on a typewriter keyboard for an infinite amount of time will almost surely type a given text, such as the complete works of William Shakespeare. Some others believe that the name comes from the classic Mac OS application "The Monkey" developed by Steve Capps prior to 1983. It used journaling hooks to feed random events into Mac programs, and was used to test for bugs in MacPaint.

Monkey Testing is also included in Android Studio as part of the standard testing tools for stress testing.

Monkey testing can be categorized into smart monkey tests or dumb monkey tests.

Smart monkeys are usually identified by the following characteristics:

Some smart monkeys are also referred to as brilliant monkeys, which perform testing as per user's behavior and can specify some probabilities of bugs to be occurred.

Dumb monkeys, also known as "ignorant monkeys", are usually identified by the following characteristics:

Monkey testing is an effective way to identify some out-of-the-box errors. Since the scenarios tested are usually ad-hoc, monkey testing can also be a good way to perform load and stress testing. The intrinsic randomness of monkey testing also makes it a good way to find major bugs that can break the entire system. The setup of monkey testing is easy, therefore good for any application. Smart monkeys, if properly set up with an accurate state model, can be really good at finding various kinds of bugs.

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