Functional and Regression Testing Introduction:

Software quality consultants must be well-versed in the distinctions between regression testing and functional testing in order to guarantee the dependability and quality of software applications. Both functional and regression testing will be defined in depth in this article, along with their aims, methodology, real-world examples, and recommended practices.

The Testing of Functionality

Define:

When evaluating a software application’s functionality, functional testing is useful since it checks each function or feature to make sure it works as intended. Input, output, and actual/expected result comparisons are the three main steps in this testing process.

The goal:

Validating that the software program behaves according to the defined criteria is the main aim of functional testing. It checks that all features and functions are functioning properly from the user’s point of view.

Approach:

Manual testing and automation tools are both viable options for functional testing. The functional specifications form the basis for the test cases, which are executed during testing to validate the software’s functionality.

Working Example :

Think of an online store where customers may browse things, put them in their virtual shopping cart, and then pay for their purchases. Website functional testing would include making sure the search feature produces relevant results, that things can be added to the basket, and that the checkout process runs quickly and error-free.

Testing for Regressions:

Define:

As a subset of software testing, regression testing checks for unintended consequences when implementing changes to the code or adding new features. To find regression bugs, it entails rerunning test cases that cover the affected areas.

The goal:

Regression testing’s main goal is to verify that the latest code modifications haven’t broken any preexisting features or added any new bugs. The product’s general stability and quality are both enhanced by this.

Approach:

It could take a lot of time to complete regression testing by hand. It is common practice to automate the runtime of test cases using automation tools. To guarantee that no regressions occur, test suites are performed whenever there is a change to the code. These suites are developed to cover important features.

Working Example:

Consider a banking app that receives frequent upgrades to address issues and offer new features. In order to ensure that the application’s functionality is intact after each update, regression testing involves rerunning test cases that pertain to account login, fund transfer, and transaction history.

Notable Distinctions:

The purpose of functional testing is to ensure that the software works as intended, while regression testing checks to see if changes to the code affect how the program currently works.

Scope:

New functionality are tested during functional testing, whereas changed or existing features are tested during regression testing.

Timing: 

Regression testing is executed following each code change, whereas functional testing is often executed prior to program release. Because of its repeated nature, regression testing frequently uses automation, whereas functional testing can be either manual or automated.

Tips for Success:

Early Testing: 

To find problems sooner, begin functional testing early in the development Cycle. Keep a solid collection of regression test suites up-to-date to cover important features. To save time and effort, use automated technologies for regression testing.

Continuous Integration:

 Speed up feedback by including regression and functional testing into the continuous integration/continuous delivery process.

Final thoughts on software quality assurance: regression testing and functional testing are musts. Software developers and testers can guarantee the performance and dependability of software programs by learning about their differences, approaches, and real-world examples.

Recommended Reading: Here is the link to the glossary:

• ISTQB Glossary
• Software Testing Help

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