docs: public boolean isVoid() {
          final MockCreationSettings mockSettings = MockUtil.getMockHandler(invocation.getMock())
              .getMockSettings();
          Class<?> returnType = GenericMetadataSupport.inferFrom(mockSettings.getTypeToMock())
              .resolveGenericReturnType(this.method)
              .rawType();
          return returnType == Void.TYPE || returnType == Void.class;
      }