Testing Levels in Software Testing

There are 4 typical levels of Testing in QA Testing Services:

Unit Testing

- a module is the smallest functional part of a program or application that cannot function separately, but only in combination with other modules. However, after the development of this module, we can already start testing and find inconsistencies with our requirements. Unit testing consists in testing this separate module as part of a program, assuming that this is only a module and it cannot exist on its own and is part of the application, the program

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Integration Testing

- the next level of testing, which is carried out after Unit testing. After the individual modules of our application have been tested, we should conduct Integration Testing to ensure that our modules function successfully in conjunction with each other. In other words, we are testing 2 or more related modules in order to check that the integration was successful and without obvious bugs.

System Testing

- the testing level in which we test an entire system or application that has been fully developed and is already ready for a potential release. At this level, we test the system, the application as a whole, conduct tests on all required browsers or operating systems (if the desktop application) and conduct all the required types of testing such as: functional, security testing, usability testing, performance testing services, load testing, etc. etc.

Acceptance Testing

- after the successful completion of System Testing, the product passes the Acceptance Testing level, which is usually carried out by the customer or any other interested parties, in order to ensure that the product looks and works as originally required and was described in the product requirements. Acceptance Testing can also be performed after each of the above test levels.