@Override
    public StreamMessage<Object> createFailedPublisher() {
        return SurroundingPublisher.of(null, Mono.error(new RuntimeException()), unused -> null);
    }
Rule 1.4 and 1.9 ensure a Publisher's ability to signal error to the Subscriber, however the
implementation expects such error to occur immediately after subscribing, i.e. {@code onError()} is
called after {@code onSubscribe()}.
The {@link SurroundingPublisher} however subscribes publisher and signals error after the first request,
therefore for the error to be signaled, we must make requests first.

{@link PublisherVerificationRules#optional_spec104_mustSignalOnErrorWhenFails()} and
{@link PublisherVerificationRules#required_spec109_mayRejectCallsToSubscribeIfPublisherIsUnableOrUnwillingToServeThemRejectionMustTriggerOnErrorAfterOnSubscribe()}
are overridden below to call {@link Subscription#request(long)} after subscribing.
core/src/test/java/com/linecorp/armeria/internal/common/stream/SurroundingPublisherTckTest.java