Unit testing involves the testing of each unit or individual component of the software application. It is the first level of software testing. The aim behind unit testing is to validate unit component with its performance.
A unit is a single testable part of a software system and tested during the development phase of the application software.
This testing aims to test the correctness of isolated code. A unit component is an individual function or code of the application. White box testing approach used for unit testing and usually done by the developers.
In a testing level hierarchy, unit testing is the first level of testing done before integration and other remaining levels of the testing. It uses modules for the testing process which reduces the dependency of waiting for Unit testing frameworks, stubs, drivers and mock objects are used for assistance in unit testing.
The reason behind Unit Testing
Generally, software goes under four level of testing: Unit Testing, Integration Testing, System Testing, and Acceptance Testing but sometimes due to time consumption software testers does minimal unit testing but skipping of unit testing may lead to higher defects during Integration Testing, System Testing, and Acceptance Testing or even during Beta Testing which takes place after the completion of software application.
Some crucial reasons are listed below:
Unit Testing Techniques:
Unit testing uses all white box testing techniques as it uses the code of software application:
Unit Testing Tools:
NUnit is a unit testing framework used mainly for.Net languages. It allows scripting of test cases manually and supports data-driven test cases.
JUnit is a unit testing framework used mainly for java languages. JUnit provides assertions for the identification of methods.
PHPUnit unit testing tool used for PHP language. It provides assertions to use assertion methods (Methods are pre-defined) to make sure that system behaves in a required manner.
Parasoft Jtest is an integrated IDE plugin Junit, Mockito, PowerMock, and Spring with easy one-click activities for scaling, creating and maintaining unit testing.
EMMA is an open source unit testing tool used for java language coding. It analyzes and reports the code of java language.
How to achieve the best result via Unit testing?
Unit testing can give best results without getting confused and increase complexity by following the steps listed below:
Advantages of Unit Testing
Disadvantages of Unit Testing