[test] Test that -blocksonly nodes do not send getdata(CMPCT) on a low bandwidth connection.

Co-authored-by: Amiti Uttarwar <amiti@uttarwar.org>

test/functional/p2p_compactblocks_blocksonly.py

@@ -80,5 +80,18 @@ class P2PCompactBlocksBlocksOnly(BitcoinTestFramework):
         p2p_conn_high_bw.wait_until(lambda: p2p_conn_high_bw.message_count['sendcmpct'] == 3)
         assert_equal(p2p_conn_high_bw.last_message['sendcmpct'].announce, True)
 
+        self.log.info("Test that -blocksonly nodes send getdata(BLOCK) instead"
+                      " of getdata(CMPCT) in BIP152 low bandwidth mode")
+
+        block1 = self.build_block_on_tip()
+
+        p2p_conn_blocksonly.send_message(msg_headers(headers=[CBlockHeader(block1)]))
+        p2p_conn_blocksonly.sync_send_with_ping()
+        assert_equal(p2p_conn_blocksonly.last_message['getdata'].inv, [CInv(MSG_BLOCK | MSG_WITNESS_FLAG, block1.sha256)])
+
+        p2p_conn_high_bw.send_message(msg_headers(headers=[CBlockHeader(block1)]))
+        p2p_conn_high_bw.sync_send_with_ping()
+        assert_equal(p2p_conn_high_bw.last_message['getdata'].inv, [CInv(MSG_CMPCT_BLOCK, block1.sha256)])
+
 if __name__ == '__main__':
     P2PCompactBlocksBlocksOnly().main()