Types of Regression Testing | Basic Concepts & Explanation

Introduction:

Regression testing is a type of software testing. It seeks to find errors and other problems in computer-based systems before the end users see them. Such errors, or bugs, are often referred to as regression bugs because they are likely to be caused by changes in the system that may have been made during later improvements, upgrades, or fixes (fixes).

Regression testing is an important part of software development. It's the process of running a system or product (such as your website) through its paces in a controlled environment, then identifying potential issues before they affect customers. Regression testing can be done from several different perspectives:

• Functional – This type of regression test checks whether the program responds correctly to input from users and performs its intended tasks. For example, if you have an e-commerce site where customers can place orders online, functional tests will include checking that the order form works properly and that the shopping cart page loads quickly when a user visits it on their computer screen or mobile device (if necessary). These types of tests ensure that all parts of your site work together smoothly so users don't get confused or frustrated while trying out new features;
• Performance – Performance tests check how fast each part of your software performs when loaded with data—whether it's retrieving information from databases or sending emails via SMTP servers.
• Usability – Usability tests look at how easy it would be for users to navigate within certain sections/pages within your website/application without getting lost a long way because those areas aren't intuitive enough yet.

Regression testing is a way to find errors before they affect your customers and finds errors in real-time. It is also an important part of your development process. It helps you find and fix errors in real time so that you can deploy new versions of your site with confidence.

When we release a new version of our software, there are always bugs that come up from unexpected places. For example, maybe a user submitted an order incorrectly and now their basket has been filled with cookies instead of bread! This would be very annoying for them (and us), but luckily regression testing allows us to catch these kinds of problems before they become big problems for our customers. These are different types of regression testing techniques being used:

Progressive Regression Testing

Progressive regression testing is a type of regression testing that is used to check the performance of a system under different load conditions. It is an iterative process that is performed with the help of a test tool. A test case can be created and executed in stages, starting with basic functionalities and gradually increasing its complexity.

Selective Regression Testing

Selective regression testing is used to test a new feature or a new change in the code. It is used to find regression in the code, bugs in the software, and even find bugs in other parts of your system like databases or services. Selective regression testing allows you to test only those parts of your application that have changed since the last time when there was no regression testing performed on them (or even if there was any).

This process can also be done manually by inspecting each file for changes, but with selective regression testing, we can take advantage of tools such as SonarQube that analyze our source code automatically and identify issues based on their rulesets (i.e., such as failing tests).

Retest-all Regression Testing

Retest-all regression testing is a method for retesting a piece of code after it has been modified. It's most commonly used in software development, but you can use it for any kind of testing.

Retest-all regression testing with selective regression testing: Selective regression means that only some parts of your codebase will be tested with this technique.

This can be helpful if you want to make sure only certain portions have been changed and not others. For example, if you have an automated test suite where most tests pass except one which fails on an intermittent basis (perhaps because there's no support for your latest feature), then retesting that particular failing unit could save time by allowing developers without access to this particular feature set its chance at being fixed before moving forward with other work.

Complete Regression Testing

It is performed when new code is added or when an existing feature is modified. It gives a comprehensive view of the system as a whole and weeds out any unforeseen problems. A sort of “final” regression testing is implemented to certify that the build (new lines of code) has not been altered for a period of time. This final version is then delivered to end users.

Partial Regression Testing

You can also use partial regression testing to test only a subset of the test cases, and then compare those results against your original set. This allows you to determine whether or not any bugs were introduced in your new code.

Corrective Regression Testing

Corrective regression testing is used when you have a problem with your software, and you want to test a fix before releasing it. The purpose of corrective regression testing is to ensure that the new version of your app will not break other functionality in your code base. The steps for performing corrective regression are:

• Run all tests again (including any retests) with the new version of the app. If any tests fail or pass differently than they did previously, then something has changed since release time and needs further investigation before release can proceed safely.
• Repeat this process until no new issues are found.

Takeaway:

Before I conclude the explanation on the topic of “types of regression testing, it can be stated that” regression testing involves trying out a system or product in a controlled environment and identifying problems. It should be done before deploying a new version of your site and doesn't need to include the backup and restore of data, it may need more data to be useful, but you can still test the ongoing function of your product even if you don't have real data.