test(gossipsub): behavior unit tests 1

[rlve]

Changes:

• add unit tests for GossipSub behaviour:
  • "handleIHave - do not handle IHave when message already in cache"
  • "handleIWant - message not handled without sent IHave"
  • "handleIWant - message not handled when not in cache"
  • "handleIWant - stops processing after 21 invalid requests"
  • "handlePrune - peer is pruned and backoff is set"
  • "handleGraft - peer joins mesh for subscribed topic"
  • "handleGraft - do not graft if peer already in mesh"
  • "handleGraft - reject peer when mesh at dHigh threshold"
  • "handleGraft - accept outbound peer when mesh at dHigh but below dOut threshold"
  • "handleGraft - reject outbound peer when mesh at dHigh and dOut threshold met"

[gmelodie]

question: why does this mean that iwant was ignored and not handled? I assume that after iwant is handled the messages queue would be empty again, no?

[rlve]

handleIWant processes IWANT requests from peers and returns the actual messages they're asking for. It takes a list of message IDs and returns a sequence of Message objects.

The function only adds messages to the result if both conditions are met:
We previously sent an IHAVE for that message ID to the peer and the message still exists in the cache.

In this test: sentIHaves doesn't contain the message id and therefore the message is not returned.