code: public static synchronized <T> IExpectationSetters<T> expectPrivate(Object instance, Object... arguments)
              throws Exception {
          return expectPrivate(instance, null, Whitebox.getType(instance), arguments);
      }
docs: Used to specify expectations on methods without specifying a method name.
  Works on for example private or package private methods. PowerMock tries
  to find a unique method to expect based on the argument parameters. If
  PowerMock is unable to locate a unique method you need to revert to using
  {@link #expectPrivate(Object, String, Object...)}.