TCK requires immediate publishing of onError, but spec does not say this is required

[gmarcosb]

In various TCK tests, there is an expectation that a closed/errored stream be immediately reported as such to the subscriber - see, for example, this test:

reactive-streams-jvm/tck/src/main/java/org/reactivestreams/tck/PublisherVerification.java

Line 533 in a625d3a

onSubscribeLatch.expectClose("Should have received onSubscribe");

However, the spec does not specify whether a subscriber should immediately get these callbacks, or if it should get them after a call to Subscription.request()

Getting no callbacks until a request is a bit more consistent with the other stream callback behaviors

But, at a minimum, it seems like the TCK test should support the case where a Publisher does not call onError/onComplete until the Subscriber makes a Subscription.request