Instances of abstract classes and interfaces for fuzzing

[denis-fokin]

Description

Currently, we handle cases of abstract collections. If a method under test accepts an abstract collection, fuzzer suggest to feed the API with instances of concrete subclasses.

It would be great to generalize such behavior. If we have a generic abstract class as a parameter type, we can feed the API with concrete implementation of subclass.

Expected behavior

Fuzzer should produce instances of concrete classes.

Environment

UTBotJava fuzzer engine.

Potential alternatives

As an alternative, we can find a method that produces an instance of the abstract class and try to create it with the concrete execution engine.

Context

No particular context.