Unit-level testing

In today”s blog we will learn about the curtain-raiser (Unit-level testing) of testing in software testing life cycle (STLC). Let’s start.

What is Unit?

A Unit is the smallest testable piece of software. It can be compiled, linked and put under the control of a driver or test harness. It is the minimal software item that can be tested as companion-less.

What is unit-level testing?

Unit-level testing is the testing of the smallest individual testable piece of software. It assures that the unit submitted is “Working as expected”.

Who and when does unit-level testing?

Programmer or developer performs the unit testing. When the unit coding is over, it needs to be checked in for configuration management. Unit testing is performed using white box testing techniques, however, Black box techniques can also be used.

Quality assurance that ignores “Unit level testing issues” is a construct build on a foundation of sand.

Boris beizer

Benefits of Unit-level testing

  • It helps the developer to learn about the functionality provided by a unit and it helps to get a basic understanding of the unit.
  • Without waiting for the completion of other parts of the product, still testing can be performed.
  • It helps to gain confidence in integration testing, As the integration of modules becomes easy.
  • Assist in identifying errors earlier.
  • Reduces bugs proportion.

Best tools for unit testing


NUnit is a unit-testing framework for all .Net languages. It supports data-driven tests that can run in parallel.


Jasmine is a unit-testing framework for JAVASCRIPT that works on behaviour-driven testing. It contains basic syntax for creating test cases.


JMockit is an open-source tool for unit testing for JAVA. It is a code-coverage tool


JUnit is an open-source unit testing framework designed for Java.


TestNG is a testing framework inspired from JUnit and NUnit. But it has introduced some new functionalities that make it more powerful and easier to use. It supports data-driven testing along with the unit, functional and integration testing.

Please tell us about your Unit testing knowledge before-and-after reading. I bet you’ll have something to say!!!

Happy learning 🙂

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