In rare cases your code might not compile with recent deprecation & changes. Very sorry for inconvenience but it had to be done in order to keep framework consistent.
Why it is deprecated? ReturnValues is being replaced by Answer for better consistency & interoperability of the framework. Answer interface has been in Mockito for a while and it has the same responsibility as ReturnValues. There's no point in mainting exactly the same interfaces.
Configures return values for an unstubbed invocation
Can be used in
@Deprecated public interface ReturnValues
Mockito, MIT License