What is Functionality Testing?
Functionality testing is a type of software testing that validates the software system against the functional requirements/specifications. The purpose of functionality tests is to test each function of the software application, by providing appropriate input, verifying the output against the Functional requirements.
Functional testing mainly involves black box testing and it is not concerned about the source code of the application. This testing checks User Interface, APIs, Database, Security, Client/Server communication and other functionality of the Application under Test. The testing can be done either manually or using automation.
Therefore, functionality testing can be carried out via two popular techniques:
What do you test in Functionality Testing?
The prime objective of Functionality testing is checking the functionalities of the software system. It mainly concentrates on -
Mainline functions:
Testing the main functions of an application.
Basic Usability:
It involves basic usability testing of the system. It checks whether a user can freely navigate through the screens without any difficulties.
Accessibility:
Checks the accessibility of the system for the user.
Error Conditions:
Usage of testing techniques to check for error conditions. It checks whether suitable error messages are displayed.
Types of Functionality Testing:
Unit Testing
Component Testing
Smoke Testing
Integration Testing
Regression Testing
Sanity Testing
System Testing
User Acceptance Testing
Advantages of Functionality Testing
Let’s highlight various advantages of Functional Testing.
Functionality testing is essential for evaluating the performance and the functionality of a software application before it is delivered to the end user for its real use.
It is performed from the perspective of the users, which allows the development team to create test scenarios that represent the real world use scenarios.
Allows the team to meet the requirements of the user as well as the client.
It helps improve actual system usage.
Enhances the quality of the software product.
It ensures that the customer or end- user is satisfied.
It produces a defect-free product/software.
It ensures the all the requirements should be met.
It ensures the proper working of all the functionalities of an application/software/product.
It ensures that the software/product works as expected.
It ensures security and safety.
It improves the quality of the product.
The risks and loss associated with the product/software reduced.
Functionality testing is more effective when the test conditions are created directly from user/business requirements. When test conditions are created from the system documentation (system requirements/ design documents), the defects in that documentation will not be detected through testing and this may be the cause of end-users’ wrath when they finally use the software.
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