Method apply

src/test/java/io/reactivex/rxjava3/maybe/MaybeTest.java:244–247

(MaybeObserver<? super Integer> t)

    public void liftJust() {
        Maybe.just(1).lift(new MaybeOperator<Integer, Integer>() {
            @Override
            public MaybeObserver<? super Integer> apply(MaybeObserver<? super Integer> t) throws Exception {
                return t;
            }
        })
        .test()
        .assertResult(1);