Video game testing is one of the most important steps in ensuring optimum quality and performance in the final product. Generally considered to be a subset of game development, game testing allows developers to maintain quality control for desktop, console and mobile games. The methodology behind game testing allows it to identify and fix bugs in the software while maintaining documentation of the software products.

1) Combinatorial Testing:
This method is mainly used for commercial software testing and for the generation of test cases. By applying combinatorial testing to a game testing process we can increase the efficiency of test execution, provide better quality, decrease costs and execute better phase containment.

Key factors:
Every possible combination of values of parameters is covered using this test process.
It is used to identify distinct attributes that can vary in data or configuration
It systematically generates combinations of parameters for testing
It includes: category-partition testing, pair testing and catalog-based testing
In this form of testing, the parameters are chosen from a list of game functions. Elements, events, settings, play options, character attributes, customization choices, etc.

2) Clean Room Testing:
This testing process is applied with the intention to develop gaming software that has a certifiable level of reliability. The aim of cleanroom testing is to produce a product with negligible errors.

Key Factors:
Programming starts after a formal specification of the game that is to be tested
No clear programmer testing method as testing is done on the content provided and its set of instructions.
This approach looks to combine mathematical reasoning, design refinement and statistical reasoning during test case generation
The main objective of this method is to produce software with minimal defects.

3) Functionality Testing:
This method determines if the end product works according to the specifications of the game developers. It is used to identify bugs or errors that may occur in the game itself and affect the user experience.

Key Factors:
This method assesses whether the game is working according to its set specifications
It is a black-box testing technique and a complex testing method
It takes a lot more time to execute as testers have to look for issues in gameplay, graphic design, audio-visual related errors, etc.
Its function is to validate that installation occurs without any issue, the application works when in minimized mode, the application features social networking options, supports payment gateways and many more.

4) Compatibility Testing:
This method is used to assess whether a game functions properly with respect to a specific device it is meant to be played on. This takes into consideration it is functioning with respect to hardware, graphics and software configurations. It is considered to be one of the most essential tools in mobile application testing that checks that a game title is compatible to run on specific devices.

Key Factors:
It is used to validate whether the user interface of the application works according to the screen size of the device while maintaining high quality
It ensures that any text featured in the game is legible for all users
This testing method ensures all necessary requirements set by the developer and end-user for the product are met
It ensures real compatibility between different testing environments
It confirms the software’s workability and stability across different platforms

5) Regression Testing:
This form of testing is conducted on unchanged parts of the software to retest it for detects. Test cases, in this scenario, are re-checked to analyze the working of the previous functions of the app work fine and ensure that any new changes have not resulted in new bugs or vulnerabilities.

Key Factors:
Conduct previously run tests to determine if the finished product has led to any changes in the previous sections
It is used to compare the previous test results with current results and determine any difference in functionality and detect any errors
It is a critical aspect of quality control
It saves time for developers by detecting bugs from the start
It can also be run as a functional test to ensure the overall usability of the end product
6) Ad hoc Testing:

This type of testing is generally unplanned in its approach and is conducted on a randomly chosen section of the gaming application. Testers do this without using test cases or any form of documentation. One of the main benefits of this type of testing is that it ensures completeness of testing as it uncovers any hidden bugs or detects that planned testing might sometimes overlook.

Key Factors:
This kind of testing does not follow any specific structure, it is randomly conducted on any section of the application
Its main purpose is to find defects using random checking
This is achieved by using the testing method of error guessing
Since the defects are not mapped to test cases, it is difficult to reproduce some defects.

7) Load Testing:
The type of testing is done to determine the performance of the system under real-time loads. Load testing indicates the reaction of an application when multiple users access the application simultaneously.

Key Factors:
It determines whether the current infrastructure is sufficient for the smooth functioning of the game
It checks the sustainability of the application with respect to peak user load
It determines the number of users the application can support and its scalability rate to support more users
It accommodates strategies for better performance management

8) Play Testing:

In this method of game testing, developers play the unfinished versions of the game to assess flaws in features like gameplay, level design, the level of difficulty, balance, etc. This process involves clarifying vague elements in the game, adding fun elements where required and balancing the story or narrative, etc.

Key Factors:
It is considered to be an integral part of game design and is commonly used in PC games as well as character-centric games
It is primarily focused on judging the game rather than finding bugs and errors
The main objective in this type of test is to check whether a game works in a well-structured manner

Implementing effective game testing requires developers to have a well defined and structured game testing methodology. Each game’s development process is different and is, therefore, important to have a clear understanding of the types of testing that will be required to detect and fix any bugs or errors to ensure a smooth and complete gaming experience.