1 files changed, 62 insertions, 0 deletions
diff --git a/test/functional/rpc_getchaintips.py b/test/functional/rpc_getchaintips.py
new file mode 100755
index 0000000000..277930bb1a
--- /dev/null
+++ b/test/functional/rpc_getchaintips.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+# Copyright (c) 2014-2017 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 the getchaintips RPC.
+
+- introduce a network split
+- work on chains of different lengths
+- join the network together again
+- verify that getchaintips now returns two chain tips.
+"""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
+
+class GetChainTipsTest (BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 4
+
+    def run_test (self):
+        tips = self.nodes[0].getchaintips ()
+        assert_equal (len (tips), 1)
+        assert_equal (tips[0]['branchlen'], 0)
+        assert_equal (tips[0]['height'], 200)
+        assert_equal (tips[0]['status'], 'active')
+
+        # Split the network and build two chains of different lengths.
+        self.split_network ()
+        self.nodes[0].generate(10)
+        self.nodes[2].generate(20)
+        self.sync_all([self.nodes[:2], self.nodes[2:]])
+
+        tips = self.nodes[1].getchaintips ()
+        assert_equal (len (tips), 1)
+        shortTip = tips[0]
+        assert_equal (shortTip['branchlen'], 0)
+        assert_equal (shortTip['height'], 210)
+        assert_equal (tips[0]['status'], 'active')
+
+        tips = self.nodes[3].getchaintips ()
+        assert_equal (len (tips), 1)
+        longTip = tips[0]
+        assert_equal (longTip['branchlen'], 0)
+        assert_equal (longTip['height'], 220)
+        assert_equal (tips[0]['status'], 'active')
+
+        # Join the network halves and check that we now have two tips
+        # (at least at the nodes that previously had the short chain).
+        self.join_network ()
+
+        tips = self.nodes[0].getchaintips ()
+        assert_equal (len (tips), 2)
+        assert_equal (tips[0], longTip)
+
+        assert_equal (tips[1]['branchlen'], 10)
+        assert_equal (tips[1]['status'], 'valid-fork')
+        tips[1]['branchlen'] = 0
+        tips[1]['status'] = 'active'
+        assert_equal (tips[1], shortTip)
+
+if __name__ == '__main__':
+    GetChainTipsTest ().main ()