Why do we need regression testing?

Tram Ho

Regression testing is a type of software testing in which previous changes to the application are re-tested to make sure that they all work properly. This is a general process and is an important part of the application development process. It is usually performed by testing experts.

What is regression testing?

Regression testing involves running the test case again and checking for code changes that don’t cause a functional issue and no errors come back after it has been successfully fixed before.

These test cases should be deployed as often as possible using the automated regression testing tool, so that code changes that damage the main flow of the active application will be identified and fixed quickly.

When there is something to test, regression testing begins. The regression test suite grows as the application goes further and testers add test cases for new tests or test as code is rewritten.

Soon, the suite is able to expand to thousands of test cases covering various application functions. Automating regression test cases becomes important because it is not possible to quickly and reliably repeat all test cases and analyze their results.

Regression testing can include any successful keyword, script, or low-level functional test that previously verified the desired functionality and application behavior. Your regression test should include test points that compare application characteristics and outputs.

The test log clearly identifies whether the regression test passed or failed and what happened, where the problem happened, and how it happened. This makes it easy for developers to detect which recent code changes have resulted in problems and quickly fix them. Detected problems can be automatically reported to the issue tracking database during or after running a regression test.

You can schedule regression testing to run unattended at a specific time or 24/7 for more thorough regression testing of applications.

Researchers have tried to make regression testing more efficient and efficient by developing selection regression testing (RTS) techniques, but there are still many problems, such as:

  • Unpredictable performance. RTS techniques sometimes save time and money, but sometimes they choose most or all of the initial test case. As a result, developers using RTS techniques may find the effect less than satisfactory.
  • Incompatible process assumptions. Test times are often limited (eg must be done overnight). RTS techniques do not consider such constraints and may therefore choose more test cases than can run.
  • The evaluation models are not suitable. RTS techniques attempt to maximize average regression test performance rather than optimize aggregate performance across multiple test sessions. However, regular testing companies may accept less efficient, but cheaper, individual test sessions if the system remains well-tested for a short period of time.

So why do regression testing needed?

Regression testing, whether manual or automated, is very important for large software applications, as it is often difficult to know whether changing one part of the problem creates a new problem for another part of the application. is not.

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Source : Viblo