Learn about Regression Testing

Tram Ho

1. What is regression testing?

Regression testing is defined as a type of software testing to confirm that a change in code or a piece of software does not adversely affect existing features.

Regression testing is a measure of quality control that ensures the following two conditions:

  • The new code meets the requirements of the regulations.
  • The Unmodified Code has not been affected by the above change.

This test method is performed to ensure that the new code changes will not cause any effect to the existing functionality. Also make sure that all old code is still working properly after the latest code changes are introduced into the software.

Circumstances need to be regression testing:

  • Change in request and code to be modified as required
  • New feature added to the software
  • Fixed bug
  • Troubleshoot performance issues

2. Characteristics and properties of the regression test:

Regression test is not a test level. It merely checks the software after a change has occurred, to make sure the new software version performs the same functionality as the old version and that the change does not cause new bugs on inherent functions. worked well. Regression testing can be performed at any test level.

Regression testing is one of the tests that takes the most time and effort. However, omitting the Regression Test is “not allowed” because it can lead to the occurrence or re-occurrence of critical errors, even though we “believe” those errors are either absent or checked. checked and repaired!

3. How to perform regression testing?

Software maintenance is an activity that includes improving, fixing bugs, optimizing, and removing existing features. These modifications can cause the system to work incorrectly. Hence, Regression testing becomes necessary. Regression testing can be performed using the following techniques:

Retest all

This is one of the methods for Regression testing in which all tests in the existing test group or checker are re-performed. This is very costly because it requires enormous time and resources.

Regression testing selection

Rather than redo the entire test case, it is better to do only a portion. The selected test cases can be classified into two categories:

  • Reusable test cases: Test cases that can be used in successful regression test lifecycle.
  • Outdated test cases: The cases that cannot be used within the successful regression test lifecycle.

Priority of test cases

Test cases are prioritized depending on business impact, critical functions and frequently used. Selection of test cases based on priority will significantly reduce the regression checker.

Select test cases for regression testing

Efficient regression testing can be performed by choosing the following test cases:

  • In test cases, errors often occur
  • The functions are more conspicuous to the user
  • Test cases verify core features of the product
  • The functionality’s test cases have undergone many changes recently
  • All integration test cases
  • All complex test cases
  • Test case of marginal value
  • A few sample test cases have been successful
  • A few of the sample test cases have failed

4. Some tools used in regression testing

If a software undergoes frequent changes, the cost of regression testing will escalate.

In such cases, the manual execution of test cases increases test execution time as well as cost.

Automating regression test cases is a smart choice in such cases.

The automation range depends on the number of test cases that are still reusable for successive regression cycles.

The following are the most important tools used for both functional testing and regression in software engineering:

  • Ranorex Studio
  • Testim
  • Selenium
  • Quick Test Professional (QTP)
  • Rational Functional Tester (RFT)

References:

https://www.guru99.com/regression-testing.html

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Source : Viblo