Code Quality Improvement - Session 42: Theoretical Testing

Let's assume a situation where different icons need to be displayed depending on an Enum class such as AccountType, which represents account types. If the Enum is UI-only, an icon property can be defined directly inside the class, but if it is widely used across multiple modules, the code can become bloated due to a dependency on a specific module.

In such cases, it is efficient to build a conversion mechanism using a separate Map. However, if the Map is not updated together whenever a new account type is added, a problem can occur where null is returned at runtime.

To prevent this, a Unit Test that checks whether all Enum entries are included in the Map has traditionally been written. However, a better approach is to use Static Verification instead of relying on tests or runtime assertions.