A Brief Overview on Functional Testing and Its Types

 Functional Testing is the most popular and widely-used form of Software Testing. As the name suggests, functional testing tests the effectiveness of different features and functions in a software system, application, or website. Functional Testing, which is simply what software does, is based either on predetermined requirements or a business use case.



Nearly every type of Functional test follows the same logic. You need to determine the function, create an output based upon typical use cases, determine the input using requirements or specifications, then execute the tests and compare actual and expected results. There are many types of software and different stages of software development. Functional tests can be used at different points of the Software Development Lifecycle which include:

  1. Unit tests.

This is the most popular type of Functional Test. It tests the individual components or units of the software before they are developed. It is important to perform Unit Tests frequently and early in development so that you can avoid more complicated issues later on.

  1. Integration tests.

Integration Tests are closely related to Unit Tests. They test how the different software components interact to create a larger system. These tests can also be used to test how different software works together, such as an e-commerce module that integrates with a rules engine.

  1. Smoke Tests.

These tests are used to determine if a particular type of software’s basic functions work according to spec. Smoke Tests, for example, can be used to verify that a website’s login portal works correctly or that the input fields in a contact form match the outputs.

  1. Sanity tests.

Sanity Tests are used to verify that software features have not been changed.

  1. Regression tests.

This version of Sanity Testing is more complicated because existing features are tested for new features. Sometimes, adding new features can cause problems with older functionality. Regression Tests can be automated using different Test Automation tools to verify that the software functions as intended.

  1. Usability tests.

Also called UI or Interface Tests, Usability Testing is the final and most comprehensive type of Testing that’s done on software using its user interface. Although Usability tests are more laborious and expensive than other types of Testing, they can be significantly simplified and more cost-effective with advanced tools.

Here are some of the many benefits that Functional Testing offers:

  • Functional testing simulates the real-world environment of the system. This is an exact replica of the product as it would look in its natural environment. Specifications are according to customer use. System specifications, Operating system, browsers, etc.
  • It does not work with assumptions, ifs or buts about the system’s structure.
  • We can be sure to deliver high-quality products that satisfy customer needs and leave satisfied customers with our final results.
  • It guarantees a bug-free product that meets all customer requirements.
  • To reduce the risk of product failure, risk-based testing is used.

If you’re looking for the best Software testing outsourcing company, then TFT is the right partner for you. We offer a range of offshore testing services like Automation Testing Services, Manual Testing Services, Penetration Testing Services to help you make your software bug-free ready for release.

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