Regression testing is performed after testing new changes and re-testing fixed bugs. During regression, the tester checks that the existing functionality hasn’t been affected, and that it still works correctly.
Regression Testing
How to run regression testing
First, determine how much time you have for regression testing and choose accordingly:
Full regression testing
Running all tests that cover the system’s key functionality
Selective regression testing
Testing only the parts of the system that could have been affected by the changes
The regression testing process is no different from regular testing, except that the test documentation has already been prepared beforehand.
An example of a regression testing bug
Version 1.0.0
A form was implemented called «Online order».
Order total
is pre-filled, and the user can enter
a promo code
to get a discount
DISCOUNT10, the final total will be reduced by
10%.
Version 1.1.0
A new feature was added to the form — payment method:
- Pay by card
- Pay on delivery
When you select «Pay by card», a discount is applied —
5%.
The new feature is being tested and works correctly.
Bug:
When combining the old feature (promo code) with the new feature (pay by card),
the final total is calculated incorrectly: the promo code discount is not applied
if the user chooses to pay by card.
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