1 files changed, 37 insertions, 0 deletions
diff --git a/test/functional/p2p_block_sync.py b/test/functional/p2p_block_sync.py
new file mode 100755
index 0000000000..d821edc1b1
--- /dev/null
+++ b/test/functional/p2p_block_sync.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+# Copyright (c) 2022 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test block download
+
+Ensure that even in IBD, we'll eventually sync chain from inbound peers
+(whether we have only inbound peers or both inbound and outbound peers).
+"""
+
+from test_framework.test_framework import BitcoinTestFramework
+
+class BlockSyncTest(BitcoinTestFramework):
+
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 3
+
+    def setup_network(self):
+        self.setup_nodes()
+        # Construct a network:
+        # node0 -> node1 -> node2
+        # So node1 has both an inbound and outbound peer.
+        # In our test, we will mine a block on node0, and ensure that it makes
+        # to to both node1 and node2.
+        self.connect_nodes(0, 1)
+        self.connect_nodes(1, 2)
+
+    def run_test(self):
+        self.log.info("Setup network: node0->node1->node2")
+        self.log.info("Mining one block on node0 and verify all nodes sync")
+        self.generate(self.nodes[0], 1)
+        self.log.info("Success!")
+
+
+if __name__ == '__main__':
+    BlockSyncTest().main()