match poller.poll_chain_tip(best_known_chain_tip).await {
Err(e) => panic!("Unexpected error: {:?}", e),
Ok(tip) => assert_eq!(tip, ChainTip::Better(better_chain_tip)),
match poller.poll_chain_tip(best_known_chain_tip).await {
Err(e) => panic!("Unexpected error: {:?}", e),
Ok(tip) => assert_eq!(tip, ChainTip::Better(better_chain_tip)),