What is parallel testing in software testing?

istqb definition of parallel testing

Parallel testing is a testing technique in which the application with two different versions are examined by providing the same input. Parallel testing technique is used to change the old version of application to new version.

parallel testing diagram
Testers examine that whether the new version of an application works in a similar way or in different way by providing the same input. In parallel testing one or more application or the subcomponents of the same appplication is tested parallely.

The main objective of parallel testing is to transform the old version of application into new version and to test the application parallely so that the time required for testing the application is reduced.

The following are the reasons for parallel testing technique:

  • Transform the old version to new and examine whether the new application works correctly.
  • The examine whether the new version works as same as the old version.
  • Examine the integrity of the new system.





Consider one example of parallel testing in which first the user is using one application of version 2.0. After some months the user started using the another version of same application 2.1.

Both the versions of same application are tested parallely to examine whether the consistency exist between both the versions.

For performing parallel testing some of the steps need to be followed:

1. Run the old and new version of the system parallely.

2.Examine the difference between both the systems.

3.If there is any difference go through the whole life cycle again by providing the same input.

4. Evaluate the output of the new system.

5.Report the bug if any found.

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