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Regression testing must be an integral part of every software development process.

This type includes all other types of testing that are performed on already tested functional and non-functional areas of the software after errors fixing or any other improvements and additions to the code.


Regression testing is a complete

or partial carrying out of test cases that have already been performed.

It is a Good Practice to Choose Such Test Cases for Regression Testing

It is a Good Practice to Choose Such Test Cases for Regression Testing:

  • that often fail;
  • that are complex;
  • verifying frequently used functions;
  • verifying main functions of the application;
  • verifying functions affected by the recent changes in the code;
  • checking boundary values;
  • checking integration issues;
  • other test cases that are found to be important.

Regression Testing is Performed After:

  • correction of the reported defects;
  • adding new functions and features to the application;
  • changes in the software requirements and adjusting the software to the new requirements.
Regression tests require constant additions and corrections to provide sufficient coverage for the recently added parts of the software.

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Common Problems of Regression Testing Are:

  • it may contain too many tests and take too much time, in particular if the system is large and complex;
  • it is hard to select the most important tests for regression testing and provide sufficient test coverage;
  • it may be difficult to determine how often regression tests must be performed.
Regression testing is mostly automated, as it contains many tests that repeat during every testing session. Nowadays there are many different tools for this purpose.

The aim of regression testing is to make sure that fixes, additions or improvements of the code haven’t caused new errors, and the reported errors do not appear any more. It is carried out numerous times during all the phases of a software development life cycle.

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Common Problems of Regression Testing Are


Advices on How to Perform Regression Testing

Advices on How to Perform Regression Testing:

  • do not postpone regression testing, it is better to perform it right after error fixing or other changes of the code;
  • pay attention to the side effects of the error fixing; the errors may be corrected, but their correction may cause other defects;
  • create regression test cases for every corrected error;
  • if there are several similar test cases, select the most efficient one and exclude the others from regression testing;
  • archive the tests that always pass;
  • focus regression testing more on the program functionality rather than on design.

It is recommended creating a library of regression tests and look through it regularly in order to find and delete duplicate tests, add the new tests, update the existing ones.

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