test_framework: BIP 434 support

diff --git a/test/functional/p2p_leak.py b/test/functional/p2p_leak.py
index ec7b9dc2..71046edb 100755
--- a/test/functional/p2p_leak.py
+++ b/test/functional/p2p_leak.py
@@ -5,7 +5,7 @@
 """Test message sending before handshake completion.
 
 Before receiving a VERACK, a node should not send anything but VERSION/VERACK
-and feature negotiation messages (WTXIDRELAY, SENDADDRV2).
+and feature negotiation messages (WTXIDRELAY, SENDADDRV2, FEATURE).
 
 This test connects to a node and sends it a few messages, trying to entice it
 into sending us something it shouldn't."""
@@ -39,6 +39,7 @@ class LazyPeer(P2PInterface):
         self.ever_connected = False
         self.got_wtxidrelay = False
         self.got_sendaddrv2 = False
+        self.got_feature = False
 
     def bad_message(self, message):
         self.unexpected_msg = True
@@ -70,6 +71,7 @@ class LazyPeer(P2PInterface):
     def on_blocktxn(self, message): self.bad_message(message)
     def on_wtxidrelay(self, message): self.got_wtxidrelay = True
     def on_sendaddrv2(self, message): self.got_sendaddrv2 = True
+    def on_feature(self, message): self.got_feature = True
 
 
 # Peer that sends a version but not a verack.
@@ -119,7 +121,7 @@ class P2PLeakTest(BitcoinTestFramework):
         no_verack_idle_peer = self.nodes[0].add_p2p_connection(NoVerackIdlePeer(), wait_for_verack=False)
 
         # Pre-wtxidRelay peer that sends a version but not a verack and does not support feature negotiation
-        # messages which start at nVersion == 70016
+        # messages which start at nVersion >= 70016
         pre_wtxidrelay_peer = self.nodes[0].add_p2p_connection(NoVerackIdlePeer(), send_version=False, wait_for_verack=False)
         pre_wtxidrelay_peer.send_without_ping(self.create_old_version(70015))
 
@@ -145,14 +147,17 @@ class P2PLeakTest(BitcoinTestFramework):
         assert not no_version_idle_peer.unexpected_msg
         assert not no_version_idle_peer.got_wtxidrelay
         assert not no_version_idle_peer.got_sendaddrv2
+        assert not no_version_idle_peer.got_feature
 
         assert not no_verack_idle_peer.unexpected_msg
         assert no_verack_idle_peer.got_wtxidrelay
         assert no_verack_idle_peer.got_sendaddrv2
+        #assert no_verack_idle_peer.got_feature ## uncomment once a feature message is supported
 
         assert not pre_wtxidrelay_peer.unexpected_msg
         assert not pre_wtxidrelay_peer.got_wtxidrelay
         assert not pre_wtxidrelay_peer.got_sendaddrv2
+        assert not pre_wtxidrelay_peer.got_feature
 
         # Expect peers to be disconnected due to timeout
         assert not no_version_idle_peer.is_connected
diff --git a/test/functional/test_framework/p2p.py b/test/functional/test_framework/p2p.py
index c6e3280d..80319479 100755
--- a/test/functional/test_framework/p2p.py
+++ b/test/functional/test_framework/p2p.py
@@ -100,7 +100,8 @@ logger = logging.getLogger("TestFramework.p2p")
 MIN_P2P_VERSION_SUPPORTED = 60001
 # The P2P version that this test framework implements and sends in its `version` message
 # Version 70016 supports wtxid relay
-P2P_VERSION = 70016
+# Version 70017 supports feature
+P2P_VERSION = 70017
 # The services that this test framework offers in its `version` message
 P2P_SERVICES = NODE_NETWORK | NODE_WITNESS
 # The P2P user agent string that this test framework sends in its `version` message