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What is Regression Testing, Best Tools and Techniques

Navdeep Singh Gill | 17 August 2020


What is Regression Testing?

Regression Testing is a process to make changes to an older program and also ensure that the old program still working even after making changes to a program. It is a normal part of software development in larger companies, performed by code specialists. Before the release of a new version of a software product, old test cases run against a new version to make sure that old capabilities are still working. To explore other testings, give a read to this blog.

What are the types of Regression Testing Techniques?

Below are the types of regression testing techniques:

Retest All

It is one of the methods of this Testing in which all tests in an existing test bucket or suite re-executed. It is costly as it requires enormous time as well as resources.

Regression Test Selection

Instead of re-executing an entire test suite, it is better to select a part of the test suite to run - Test chosen cases categorized as
  • Reusable Test cases
  • Obsolete Test cases
Reusable Test cases used in succeeding Regression cycles. Obsolete Test cases not used in succeeding cycles.

Prioritization of Test cases

To prioritize test cases depending on a business impact, critical and frequency used functionalists. The selection of test cases based on priority will significantly reduce the regression test suite.
Continuous Testing is a procedure of testing early, testing regularly, test everywhere, and automate testing on a continuous basis. Source: Continuous Testing in DevOps

How does Regression Testing Work?

It is done manually. However, as application development takes time, more and more functionality keeps increasing the scope of regression; therefore this Testing is executed in an automated way. While preparing a test suite for regression, consider the following -
  • Automate all the test cases of a test suite.
  • Update the regression suite whenever required, like if any new defect which not covered in a test case found, update the test case for that issue in a test suite. Perform Testing for a bug and uncover it next time.
  • Execute regression test cases, whenever changes made in code, perform bug fixing, new functionality added, and also an enhancement to existing functionality done.
  • Create a test execution report which includes the pass/fails status of executed test cases.

What are the Benefits of Regression Testing?

    • Change in requirements and code modified according to the requirement.
    • New features added to the software.
    • Defect fixing.
    • Unit testing.
    • Schedule a time to test.

The variety of methods, tools, and practices used to justify that a software application works at many different levels or not. Source- Automation Testing

What are the Best Practises of Regression Testing?

To do this testing, select test cases in the best way. Best Practises are as follows -

  • Test cases that have frequent defects.
  • Functionalities that are more visible to the users.
  • Test cases that verify the deep /core features of a product.
  • Test cases for functionalities that undergo more and recent changes.
  • All Integration Test cases.
  • All complex test cases.
  • Boundary Value test cases.
  • A sample of successful test cases.
  • A sample of failed test cases.

What are the best Regression Testing Tools?

To do it manually leads to a wastage of time and cost. To save time and cost, an automated way of Testing adopted. For this, some tools are mentioned as follows:


Selenium is an open-source tool used for automating web applications. Selenium also used for browser-based testing.

Quick Test Professional

HP QuickTest Professional, is an automated software designed to automate functional and regression test cases. It makes use of Vb Script language for automation.

  • AdventNet QEngine
  • Regression Tester
  • vTest
  • Watir
  • Actiwate
  • Rational Functional Tester
  • SilkTest
  • TimeShiftX


It is one of the most critical aspects of Testing as it helps to deliver a quality product, providing ensure that change in code, whether it's small or large, should not affect the existing or old functionality. A large number of available automated tools help in the automation of a regression best test case. A tool should have the ability to update a test suite, as the Regression test suite needs to be updated frequently. You can also explore more about Functional Testing in this insight.

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