What is Unit Testing? Unit Testing Tools and Types | W3Softech

Unit Testing

The process of testing the individual units of software is called Unit Testing. It will be done during the development of a software application. According to the programming procedure, a unit may be an individual function of the software.

Unit Testing is one of the levels of software testing and usually done by the developer. It is the first level of testing. Developers or QA Engineers will handle this testing.

Working Process of Unit Testing

• With the help of this testing, we can fix bugs or errors during the development cycle
• It enables developers to make changes quickly and saves cost
• It helps to get a good quality software product

Unit Testing Types

It is of two types namely Manual or Automated.

Most probably performed by manually but developers always prefer to do automation testing. It is a white box testing technique comes under following test coverage techniques

• Branch Coverage
• Condition Coverage
• Decision Coverage
• Statement Coverage

Using White box testing methods

• Test cases can be derived that all independent paths within a module have been exercised at least once.
• Exercise all logical decisions on their true and false sides.
• Executes all loops at their boundaries.
• Exercise internal data structures to assure their validity.

Unit Testing Tools

• JTest
• JUnit
• NUnit
• JMockit
• EMMA
• PHPUnit
• xUnit.net
• TestNG
• QuiltHTTP
• HTMLUnit
• EmbUnit
• SimpleTest
• ABAPUnit
• TypeMock
• LRDA
• Cantata
• Karma
• Jasmine
• Mocha
• Parasoft

Advantages

• Developers will be able to understand the functionality of the Unit API
• It helps the developers to rewrite and modify the code anytime and ensure the unit works as usual
• It helps to test each and every unit of the software application so that named as Unit Testing

Disadvantages

• It is very complicated to test each and every unit in large scale programs as it takes a lot of time
• There may be a chance of missing units or paths of code in trivial programs
• It allows testing only certain units or paths of code so that we are unable to grab the integration errors

Levels of Testing | Software Testing Levels | W3Softech

There is a total of four levels of testing available in software testing. Here levels can be defined as the process of each and every component of a system is being tested. These four software testing levels are designed to determine any missing errors or functions of a software application in the development of software testing lifecycle.

The Four Levels of Testing in Software Testing:

1. Unit Testing
2. Integration Testing
3. System Testing
4. Acceptance Testing

Unit Testing:

It is the first level of testing in Software Testing also one of the types of functional testing. A unit of a software system is being tested to check the performance of the system is said to be Unit Testing. The main function of unit testing is to test each unit or component of a software application separately.

However, it is impossible to test each and every unit of a software system as there is a limitation for a number of scenarios.

Integration Testing:

It is one of the levels of testing in software testing also comes under functional testing types. It is quite opposite to the unit testing. Integration Testing is a combination of different units or modules. To make a group and perform testing to check the performance of a system. The main aim of this testing is to recognize the interface between the modules.

Software Testing Levels

System Testing:

It helps to determine the compliance of a software system which also meets the specific requirements and quality standards. System Testing involves load testing, performance testing, reliability testing and security testing. It also comes under functional testing types and black box testing technique.

However, it is impossible to perform testing on the whole system so that it uses some of the automation testing tools.

Acceptance Testing:

It is the final level of testing in software testing which also comes under one of the functional testing types. Acceptance Testing or User Acceptance Testing (UAT) helps to determine whether the software application is ready to deliver. It plays a major role in checking whether the system meets expected business requirements and quality standards and ready to deliver.

Reference: Levels of Testing | Software Testing Levels | W3Softech