docs: public static <A> Answer<Void> toAnswer(final VoidAnswer1<A> answer) {
          return new Answer<Void>() {
              @SuppressWarnings("unchecked")
              public Void answer(InvocationOnMock invocation) throws Throwable {
                  answer.answer((A)invocation.getArgument(0));
                  return null;
              }
          };
      }