What is a recommended practice when testing code for correctness?

Identifying boundary cases and testing them is a recommended practice when assessing code for correctness because boundary values often reveal issues that may not be evident through regular input testing. In programming, boundary cases are the values at the extreme ends of valid input ranges, such as values just above, at, or just below limits. These scenarios can expose off-by-one errors, overflow problems, and other bugs that typically arise when the logic is pushed to its limits.

By focusing on these critical points in the input space, you ensure that your code can handle the full range of expected inputs. This practice enhances the robustness of your software, contributing to its overall reliability and correctness. Testing only typical cases may leave potential vulnerabilities unchecked, whereas overlooking the importance of boundary testing can lead to significant unnoticed errors in real-world use.