message: Add test case for mempool->block zmq notification
diff: @@ -123,6 +123,13 @@ class ZMQTest (BitcoinTestFramework):
  hex = rawtx.receive()
  assert_equal(payment_txid, hash256_reversed(hex).hex())
  + # Mining the block with this tx should result in second notification
  + # after coinbase tx notification
  + self.nodes[0].generatetoaddress(1, ADDRESS_BCRT1_UNSPENDABLE)
  + hashtx.receive()
  + txid = hashtx.receive()
  + assert_equal(payment_txid, txid.hex())
  +
  self.log.info("Test the getzmqnotifications RPC")
  assert_equal(self.nodes[0].getzmqnotifications(), [
  