How many test cases are in regression and how is regression organized?

The number of test cases in regression testing depends on the size and complexity of the project, as well as the volume of changes. Usually, regression covers critical and frequently used functionalities, as well as those that may have been affected by changes. This can range from a few dozen to hundreds of test cases.

Regression organization:

• A basic set of tests (smoke tests) is selected, which quickly checks the main functions.
• An extended set of tests covers all key scenarios.
• Automation of regression allows tests to be run quickly and regularly, for example, with each build.
• Test priorities are set based on risk and importance of functions.
• Regression tests are updated as new functionality is added or requirements change.

Example: when releasing a new version, a full regression is run, including automated and manual tests, to ensure that the old functionality has not broken.