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Pair testing is a software development technique in which two team members work together at one keyboard to test the software application. One does the testing and the other analyzes or reviews the testing. This can be done between one tester and developer or business analyst or between two testers with both participants taking turns at driving the keyboard.
This can be more related to pair programming and exploratory testing of agile software development where two team members are sitting together to test the software application. This will help both the members to learn more about the application. This will narrow down the root cause of the problem while continuous testing. Developer can find out which portion of the source code is affected by the bug. This track can help to make the solid test cases and narrowing the problem for the next time.
Benefits and drawbacks
Less participation is required for testing and for important bugs root cause can be analyzed very easily. The tester can very easily test the initial bug fixing status with the developer.
This will make the developer to come up with great testing scenarios by their own
This can not be applicable to scripted testing where all the test cases are already written and one has to run the scripts. This will not help in the evolution of any issue and its impact.
This is more applicable where the requirements and specifications are not very clear, the team is very new, and needs to learn the application behavior quickly.
This follows the same principles of pair programming; the two team members should be in the same level.