Regression analysis is a statistical technique used to examine the relationship between a dependent variable and one or more independent variables. This methodology is employed to predict the trend of the dependent variable based on the values of the independent variables.

Use in software testing: In the context of software testing, regression analysis refers to the use of scripted tests to verify software against all possible expected inputs. Typically, developers create a set of regression tests that are executed before the release of a new version of the software. These tests serve to ensure that code changes do not introduce new bugs or issues with existing functionality.

Testing process: Regression tests are fundamental in the software development lifecycle, especially when changes are made to the code. This set of automated tests is executed to ensure that new changes do not have negative effects on the behavior of existing software. Each test checks whether previously verified functionalities continue to work correctly after the modifications.

Fuzzing: Another related term is “fuzzing.” This is an automated testing technique that sends random or semi-random inputs to the software to discover vulnerabilities and unexpected behaviors. While fuzzing focuses on unexpected inputs to find bugs, regression testing focuses on expected inputs to ensure that the software continues to function as intended.

Importance: Regression analysis is essential for maintaining software quality and user trust. It ensures that new features can be added without compromising existing ones, reducing the risk of malfunctions and improving the overall reliability of the software.