• By  Shoaib Khan    23-Jan-2023 
•   243

Functional testing is a type of testing that focuses on the functionality of the software and its compliance with the requirements. It tests the specific functionality of the software, such as its ability to process input, perform calculations, or store and retrieve data.

What are the differences between Functional and Non-functional Testing?

Functional testing is a type of testing that focuses on the functionality of the software and its compliance with the requirements. It tests the specific functionality of the software, such as its ability to process input, perform calculations, or store and retrieve data.

Non-functional testing, on the other hand, focuses on the performance and reliability of the software. It tests the software's ability to handle load, stress, security, usability, and compatibility, among other non-functional requirements.In summary, functional testing is mainly focused on "does it work", Non-functional testing is mainly focused on "how well it works"

1) Functional testing:

Functional testing is a type of software testing that verifies that a product, component, or system meets its specified requirements. It tests the specific functionality of the software and its compliance with the requirements. The main goal of functional testing is to ensure that the software works correctly and as intended.

There are various types of functional testing, including unit testing, integration testing, system testing, acceptance testing, and regression testing. Unit testing is the testing of individual units of code, such as functions or methods. Integration testing checks how different units of code work together. System testing verifies that the entire system meets the specified requirements. The customer performs acceptance testing to ensure that the system meets their needs. Regression testing is done to ensure that changes to the code haven't introduced new bugs. Functional testing can be done manually or through automation, and it is usually done in parallel with non-functional testing.

2) Non-functional testing:

Non-functional testing is a type of software testing that focuses on the performance, reliability, scalability, and other non-functional aspects of a product, component, or system. The main goal of non-functional testing is to ensure that the software can handle the expected load, stress, and other conditions, and that it meets the specified non-functional requirements.

There are several types of non-functional testing, including:

• Performance testing: measures the software's response time, throughput, and resource usage under different loads and conditions.

• Load testing: checks how the system behaves when it is under a heavy load.

• Stress testing: examines the software's ability to handle an excessive load, beyond normal usage conditions.

• Security testing: evaluates the software's security features and measures its resistance to attacks.

• Usability testing: tests how easy the software is to use and navigate.

• Compatibility testing: checks if the software is compatible with different platforms, browsers, and devices.

• Recovery testing: evaluates the software's ability to recover from failures and errors.

Non-functional testing can be done manually or through automation, and it is usually done in parallel with functional testing.

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