[test] Add test for NODE_COMPACT_FILTER.

Test that a node configured to serve compact filters will signal
NODE_COMPACT_FILTER service bit.

Author: jimpo

test/functional/p2p_blockfilters.py

@@ -4,12 +4,13 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Tests NODE_COMPACT_FILTERS (BIP 157/158).
 
-Tests that a node configured with -blockfilterindex and -peerblockfilters can serve
-cfilters, cfheaders and cfcheckpts.
+Tests that a node configured with -blockfilterindex and -peerblockfilters signals
+NODE_COMPACT_FILTERS and can serve cfilters, cfheaders and cfcheckpts.
 """
 
 from test_framework.messages import (
     FILTER_TYPE_BASIC,
+    NODE_COMPACT_FILTERS,
     hash256,
     msg_getcfcheckpt,
     msg_getcfheaders,
@@ -70,6 +71,14 @@ def run_test(self):
         self.nodes[1].generate(1001)
         wait_until(lambda: self.nodes[1].getblockcount() == 2000)
 
+        # Check that nodes have signalled NODE_COMPACT_FILTERS correctly.
+        assert node0.nServices & NODE_COMPACT_FILTERS != 0
+        assert node1.nServices & NODE_COMPACT_FILTERS == 0
+
+        # Check that the localservices is as expected.
+        assert int(self.nodes[0].getnetworkinfo()['localservices'], 16) & NODE_COMPACT_FILTERS != 0
+        assert int(self.nodes[1].getnetworkinfo()['localservices'], 16) & NODE_COMPACT_FILTERS == 0
+
         self.log.info("get cfcheckpt on chain to be re-orged out.")
         request = msg_getcfcheckpt(
             filter_type=FILTER_TYPE_BASIC,

test/functional/test_framework/messages.py

@@ -49,6 +49,7 @@
 NODE_GETUTXO = (1 << 1)
 NODE_BLOOM = (1 << 2)
 NODE_WITNESS = (1 << 3)
+NODE_COMPACT_FILTERS = (1 << 6)
 NODE_NETWORK_LIMITED = (1 << 10)
 
 MSG_TX = 1