What is Monkey & Gorilla Testing? Examples, Difference

Software TestingAutomation TestingTesting Tools

Monkey Testing

Monkey Testing is a software testing approach wherein the tester inserts any arbitrary inputs into the software application without prepared test scenarios and observes the software program's behavior to determine whether or not it collapses. The goal of monkey testing is to use innovative ways to uncover faults and problems in software applications.

  • The tester (and occasionally the developer) is referred to as the 'Monkey' in Monkey Testing.

  • When a monkey uses a computer, he will execute any job on the system that is beyond his comprehension.

  • Similarly, the tester would deploy randomized test scenarios to the system under test in order to detect glitches without specifying any test scenarios.

  • Monkey Testing may also be used for Unit Testing or GUI Testing in certain instances.

What exactly is Gorilla Testing?

Gorilla Testing is a software testing approach in which a program module is checked regularly to verify that it is operating properly so that there are no bugs in that module.

A module may be evaluated a hundred times in the very same way. As a result, Gorilla Testing is often referred to as "Frustrating Testing."

The History of Monkey Testing

It was initially used to find defects on a Mac in 1983. These were the applications Macwrite and Macpaint. Memory was limited on the early Mac.

There was very little memory available after the application had been fully launched than was necessary to do the test. As a result, Macwrite and MacPaint employed caches that were far bigger than the rest of the desktop screen. As a result, it became critical to develop some testing method that used less storage.

As a result, Steve Capps utilized the Monkey software to insert useless data into Macwrite and Macpaint. The Monkey worked in tandem with the other programs, data entering functioning in the system.

It would operate quicker than an ordinary user, as if a monkey was demonstrating his speed. As a result, the team opted to configure instructions, window actions, and menu selections to address the tester's needs.

The phrase "monkey testing" originally appeared in Glenford J. Myers' 1979 book "The Art of Software Testing." It is a well-known practice among software developers.

Monkey testing is a software testing approach in which the administrator delivers some arbitrary inputs to the software in order to analyze its behavior.

It also determines if the system or application will function effectively or collapse under such situations. The tester often uses the assessment at the beginner's level.

Monkey Testing Features

Hearing the word Monkey Testing conjures up images of monkeys beating on keyboard keys and functioning as computer experts, creating functions, and other material.

All of the accidental keystrokes on the keyboard may result in excellent work since they may strike any potential sequence. Everything may appear to be in order.

Monkey testing is an automated test that is performed without regard for any specifications. The primary goal of the test is to identify mistakes and flaws in the program in order to assure the product's entire development.

Advantages of Monkey Testing

  • Bugs of a different kind − Aside from previous reported situations, the tester can have complete access to constructing tests according to his knowledge that may provide the number of new mistakes present in the system.

  • Simple to carry out − Conducting random checks against random data is a simple approach to put the system through its paces.

  • Less Trained Personnel − Monkey Testing may be carried out without the need of trained testers (but not always)

  • Less Expensive − Takes considerable less money to build up and perform test cases.

Limitations of Monkey Testing

  • There is no way to recreate a glitch: Because testers run tests at randomly with random data, replicating any defect or mistake may be impossible.

  • Reduced Reliability: The tester is unable to describe the specific test plan and cannot even meet the requirement of test scenarios.

  • This is not always worth compromising on precision, thus in order to make testing process more realistic, testers must have solid technical understanding of the subject.

  • Reduced faults and time - intensive: Because there are no predetermined tests, this testing can last longer and identify fewer defects, which may produce flaws in the system.

One could think that Monkey Testing, Gorilla Testing, and Ad-hoc Testing are just the same because they all have certain similarities, but the truth is they're not. How?

Firstly, we'll look at the differences between monkey and gorilla testing. To prevent confusion, first be explicit about it.

Difference between Monkey Testing & Gorilla Testing

Monkey TestingGorilla Testing
Monkey Testing is done at irregular intervals, with no prepared test scenarios.
It is neither predetermined nor arbitrary.
Monkey testing is conducted on the complete system and may include several test scenarios.
Gorilla Testing is done on a small number of modules with a small number of test cases.
The goal of Monkey Testing is to look for system crashes.
The goal of Gorilla testing is to determine whether or not module is operating correctly.

Difference between Monkey Testing & Ad-hoc Testing

Monkey TestingAd-hoc Testing
Monkey Testing is done randomly, with no prepared test cases.
Ad hoc testing is carried out with no preparation or record (test cases and SRS)
In Monkey Testing, testers may not understand just what system is all about or what its goal is.
Prior to starting Ad-hoc Testing, the tester must have a thorough understanding of the system.
The goal of Monkey Testing is to look for system crashes.
The goal of ad hoc testing is to arbitrarily partition the system into sub categories and evaluate their functioning.

Monkey Testing Varieties

Monkey Testing is even further subdivided into numerous areas based on how it is implemented;

  • Dumb Monkey − Testers have no knowledge of the system or its functioning, and they have no guarantee that the test case is genuine.

  • Smart Monkey − The tester understands the system's purpose and operation. To do testing, the tester navigates the system and provides legitimate inputs.

  • Brilliant Monkey − Testers execute testing based on user behavior and can indicate the likelihood of issues occurring.

Monkey testing is also possible on Android. With using technologies, monkey testing may become more productive. It may also be utilized to discover more issues, much as other methods of testing. What is the basic approach to be taken if we employ a tool for Monkey Testing? Just a brief glance;

  • The initial step, as with any other testing tool, is to enroll your program with the dedicated server.

  • Make absolutely sure you have all of the references you'll need to develop a test suite.

  • Execute the constructed test suit

  • The test record that will be produced to document test results is called 'Monkey Test.'

  • Please remember that the test will continue until the system crashes, at which time the activity will be logged in a log file.

  • Lastly, the test report is distributed to the appropriate individuals, and the test data is saved and utilized for reference purposes.

Monkey Testing can be performed through the use of tools, however because it is a new type of testing that has not yet been developed on an industry level, these technologies have less credibility than others. This condition may alter in the next period of Testing Process, in which case we must consider the forthcoming influence of Monkey testing and its considerable impact on industry norms. This is an introduction lesson for Monkey Testing that covers the fundamentals.


  • Monkey Testing is a relatively new sort of testing method.

  • It differs substantially from Gorilla testing and Ad-hoc testing.

  • Monkey testing can be useful in certain fields of testing.

  • Monkey Testing is classified into three forms in software engineering: Dumb Monkey, Smart Monkey, and Brilliant Monkey.

  • Monkey Testing may be mechanized, productive, and quick with the use of tools.

Published on 17-Dec-2021 11:55:43