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What Is The Difference Between Uat, Sit, And Unit Testing? Who Performs Them?

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By Author: Huruska William
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In the software testing methodology, there are a number of testing phases having significant importance and purposes. From the initial Unit Testing to the final stage of User Acceptance Testing (UAT), each phase is important for achieving a quality-assured software.

Among the different testing phases, Unit Testing, System Integration Testing (SIT), and UAT have special importance. These are the steps for building a proper testing practice and as well as the final step for achieving a quality-oriented software, meets the needs of clients and end-users, etc.

Testing of the software is done both by both developers and testers at various testing phases. Also, the teams use different approaches and practices in order to test the application. A few of such testing phases are Unit Testing, SIT, and UAT.

In Unit testing, developers write and execute for validating the working of each unit; in SIT the testers get involved, and whereas in UAT, end-users or clients test the application. Along with these, there are even more differences that should be known by the teams for achieving a successful bug-free and quality-oriented application.

What is Unit Testing?

In Unit testing, each small unit of the program are tested to validate whether they are working well or not
In this method, developers write and execute the test cases
Unit testing is performed by developers during the development of the application
This testing practice is a kind of white-box testing
With unit testing, it is easier to find the issues related to the functionality of the units, but it doesn’t help to find integration errors and other application errors

What is System Integration Testing (SIT)?

In SIT, individual modules are integrated or combined to test as a group.
This is practiced after unit testing and before of system testing
The purpose of this method is to validate and verify the reliability, performance testing, and functionality of the software modules
Integration testing is effectively performed by testers.
It uses different testing approaches such as a top-down approach, a bottom-up approach, and a big-bang approach.

What is User Acceptance Testing (UAT)?

UAT is performed at the last phase of software testing
This is performed to validate if the developed software is meeting the needs of both clients and end-users
This method effectively performed by considering end-users and clients
UAT testing uses different testing approaches such as alpha and beta testing, contract acceptance testing, black-box acceptance testing, regulation acceptance testing, etc.

Conclusion:

The above-mentioned are the differences between the three different software testing phases, i.e. Unit Testing, System Integration Testing (SIT), and User Acceptance Testing (UAT). These are three practiced by different team members and have several other differences too. But, apart from these differences, the common goal of these three testing phases is to achieve the application that is quality-assured, bug-free, and meets the expectation of both clients and end-users.

Hence, it is important for enterprises to understand them and perform them with the best testing methods. Leverage software testing services from the next-gen QA services teams for the best testing strategies.

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