Merge bitcoin#26805: tests: Use unique port for ZMQ tests to allow for multiple test instances

c6119f4 tests: Use unique port for ZMQ tests (Andrew Chow)

Pull request description:

  The ZMQ interface tests should use unique ports as we do for the p2p and rpc ports so that multiple instances of the test can be run at the same time.

  Without this, the test may hang until killed, or fail.

ACKs for top commit:
  MarcoFalke:
    ACK c6119f4

Tree-SHA512: 2ca3ed2f35e5a83d7ab83740674fed362a8d146dc751156cfe100133a591347cd1ac9d164046f1744d65451a57c52cb22d3bb2161105f421f8f655c4a2512c59

Author: MarcoFalke

test/functional/interface_zmq.py

@@ -22,6 +22,7 @@
 from test_framework.util import (
     assert_equal,
     assert_raises_rpc_error,
+    p2p_port,
 )
 from test_framework.wallet import (
     MiniWallet,
@@ -106,6 +107,7 @@ def set_test_params(self):
         # This test isn't testing txn relay/timing, so set whitelist on the
         # peers for instant txn relay. This speeds up the test run time 2-3x.
         self.extra_args = [["-whitelist=noban@127.0.0.1"]] * self.num_nodes
+        self.zmq_port_base = p2p_port(self.num_nodes + 1)
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_py3_zmq()
@@ -179,7 +181,7 @@ def test_basic(self):
         # Invalid zmq arguments don't take down the node, see #17185.
         self.restart_node(0, ["-zmqpubrawtx=foo", "-zmqpubhashtx=bar"])
 
-        address = 'tcp://127.0.0.1:28332'
+        address = f"tcp://127.0.0.1:{self.zmq_port_base}"
         subs = self.setup_zmq_test([(topic, address) for topic in ["hashblock", "hashtx", "rawblock", "rawtx"]])
 
         hashblock = subs[0]
@@ -246,7 +248,7 @@ def test_basic(self):
 
     def test_reorg(self):
 
-        address = 'tcp://127.0.0.1:28333'
+        address = f"tcp://127.0.0.1:{self.zmq_port_base}"
 
         # Should only notify the tip if a reorg occurs
         hashblock, hashtx = self.setup_zmq_test(
@@ -300,7 +302,7 @@ def test_sequence(self):
         <32-byte hash>A<8-byte LE uint> : Transactionhash added mempool
         """
         self.log.info("Testing 'sequence' publisher")
-        [seq] = self.setup_zmq_test([("sequence", "tcp://127.0.0.1:28333")])
+        [seq] = self.setup_zmq_test([("sequence", f"tcp://127.0.0.1:{self.zmq_port_base}")])
         self.disconnect_nodes(0, 1)
 
         # Mempool sequence number starts at 1
@@ -444,7 +446,7 @@ def test_mempool_sync(self):
         """
 
         self.log.info("Testing 'mempool sync' usage of sequence notifier")
-        [seq] = self.setup_zmq_test([("sequence", "tcp://127.0.0.1:28333")])
+        [seq] = self.setup_zmq_test([("sequence", f"tcp://127.0.0.1:{self.zmq_port_base}")])
 
         # In-memory counter, should always start at 1
         next_mempool_seq = self.nodes[0].getrawmempool(mempool_sequence=True)["mempool_sequence"]
@@ -549,8 +551,8 @@ def test_multiple_interfaces(self):
         # chain lengths on node0 and node1; for this test we only need node0, so
         # we can disable syncing blocks on the setup)
         subscribers = self.setup_zmq_test([
-            ("hashblock", "tcp://127.0.0.1:28334"),
-            ("hashblock", "tcp://127.0.0.1:28335"),
+            ("hashblock", f"tcp://127.0.0.1:{self.zmq_port_base + 1}"),
+            ("hashblock", f"tcp://127.0.0.1:{self.zmq_port_base + 2}"),
         ], sync_blocks=False)
 
         # Generate 1 block in nodes[0] and receive all notifications
@@ -567,7 +569,7 @@ def test_ipv6(self):
         self.log.info("Testing IPv6")
         # Set up subscriber using IPv6 loopback address
         subscribers = self.setup_zmq_test([
-            ("hashblock", "tcp://[::1]:28332")
+            ("hashblock", f"tcp://[::1]:{self.zmq_port_base}")
         ], ipv6=True)
 
         # Generate 1 block in nodes[0]