properly test get_zmq_notifications

integration_test/run.sh

@@ -34,7 +34,9 @@ bitcoind -regtest $BLOCKFILTERARG $FALLBACKFEEARG \
     -rpcport=12349 \
     -server=1 \
     -txindex=1 \
-    -printtoconsole=0 &
+    -printtoconsole=0 \
+    -zmqpubrawblock=tcp://0.0.0.0:28332 \
+    -zmqpubrawtx=tcp://0.0.0.0:28333 &
 PID2=$!
 
 # Let it connect to the other node.

integration_test/src/main.rs

@@ -13,6 +13,7 @@
 #[macro_use]
 extern crate lazy_static;
 
+use std::cmp::Ordering;
 use std::collections::HashMap;
 use std::str::FromStr;
 
@@ -32,7 +33,7 @@ use bitcoin::{
     Sequence, SignedAmount, Transaction, TxIn, TxOut, Txid, Witness,
 };
 use bitcoincore_rpc::bitcoincore_rpc_json::{
-    GetBlockTemplateModes, GetBlockTemplateRules, ScanTxOutRequest,
+    GetBlockTemplateModes, GetBlockTemplateRules, ScanTxOutRequest, GetZmqNotificationsResult,
 };
 
 lazy_static! {
@@ -1424,10 +1425,32 @@ fn test_get_index_info(cl: &Client) {
 }
 
 fn test_get_zmq_notifications(cl: &Client) {
-    let zmq_info = cl.get_zmq_notifications().unwrap();
+    let mut zmq_info = cl.get_zmq_notifications().unwrap();
+
+    // it doesn't matter in which order Bitcoin Core returns the result,
+    // but checking it is easier if it has a known order
+    zmq_info.sort_by(|a, b| {
+        if a.address < b.address {
+            Ordering::Less
+        } else if a.address == b.address {
+            Ordering::Equal
+        } else {
+            Ordering::Greater
+        }
+    });
 
-    // no zmq subscribers are configured
-    assert!(zmq_info.is_empty());
+    assert!(zmq_info == vec![
+        GetZmqNotificationsResult {
+            notification_type: "pubrawblock".to_owned(),
+            address: "tcp://0.0.0.0:28332".to_owned(),
+            hwm: 1000
+        },
+        GetZmqNotificationsResult {
+            notification_type: "pubrawtx".to_owned(),
+            address: "tcp://0.0.0.0:28333".to_owned(),
+            hwm: 1000
+        },
+    ]);
 }
 
 fn test_stop(cl: Client) {