терминология – Term when code is broken during refactoring

Question:

What is the name of the refactoring, as a result of which they got rid of low-quality code but at the same time broke half of the functionality?

Everything seems to compile and look perfect, but it doesn't work.

Answer:

refactoring as a result of which they got rid of low-quality code but at the same time broke half of the functionality

This is called "regression" or "regression", and it doesn't matter what you did: add new functionality and break the old one, or just refactor without adding new features and reworking the current ones.

Let's take a few definitions as an example.

Roy Osheroff, The Art of Unit Testing:

A regression is one or more units of work that once worked but no longer work.

The International Software Testing Qualifications Board (certificate program) in the glossary defines:

regression – A degradation in the quality of a component or system due to a change.

There is a set of activities aimed at trying to diagnose such things – regression testing or testing for regression.

Typically, such testing is so complex that the Q&A team does a full regression test at the end of the iteration.

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