Naming conventions test inner classes help drive consistency across the codebase, which makes it easier to read and understand source code.
Apex test inner classes
Pattern. Use a regular expression to define the validation pattern for your class names.
Hint. Add a hint to be displayed when a detection is flagged, in order to give developers a tangible example of a name that suits naming convention. (Warning: the hint is not validated, make sure it matches your validation pattern before adding it).