What is Regression testing?

Regression testing is a type of software testing that is used to ensure that recent code changes do not negatively impact the existing features. In this type of testing, the tester will execute existing tests partially or completely to check if features that currently exist are not negatively impacted by the recent code changes.

Regression testing can be done any time after the code changes happen. This could be because of a requirement change or after implementation of a new feature, or after a bug fix or a performance issue fix. Regression testing is done to ensure the product works fine with the new functionality, bug fixes or any change to the existing feature. Usually, regression testing is incorporated into the daily life cycle and is also performed before weekly releases.

Regression testing can be done either manually or by using automation tools. A smart tester will decide the best approach based on the extent of tests as part of the regression. The smart approach on regression testing is to automate the tests as much as possible, as regression tests would need to be done many times in a single product release. By doing this, the tester can save lot of time, effort and in the meantime reduce the cost. A QA expert can classify regression testing techniques into various groups such as retest all, select a particular group of tests and prioritize the tests depending on the features being tested.

Regression testing can help ensure the product is meeting customer expectations. Regression testing can detect bugs and defects in the early stages of software development life cycles and therefore reduce the time, cost and effort invested to resolve the defect and speedup the software release process.

Integrating new features with existing ones can generate lot of conflicts and side effects. Regression testing is very helpful to find the root cause and then help modify the design issues to maintain the integrity of the product. Regression testing can be done either manually or by using an automation framework. Manual regression testing consumes lot of time and effort. In order to save the cost and time, implementing automation testing is a good solution. There are lot of different automation tools and frameworks available in the market. A good QA company will be able to research the best tool and methodology that matches the project. Once a good tool and framework has been selected, the tester can then work on automating the required tests to make the whole process efficient and cost effective