Add tests

Fix whitespace

Set correct permissions

Adjust test positon and fix num nodes

test/functional/feature_rewind.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2023 The PIVX Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://www.opensource.org/licenses/mit-license.php.
+
+"""Test running pivxd with -rewindblockindex option.
+
+- Start 2 Nodes
+- Sync both nodes to different chains
+- Stop and then start both nodes with -rewindblockindex
+
+"""
+
+from test_framework.test_framework import PivxTestFramework
+from test_framework.util import (
+        assert_equal,
+        connect_nodes,
+)
+
+class RewindBlockIndexCheckpointTest(PivxTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 2
+        self.extra_args = [
+                ['-nuparams=PoS:201', '-nuparams=PoS_v2:201', "-whitelist=127.0.0.1", '-debug=0'], #right chain
+                ['-nuparams=PoS:301', '-nuparams=PoS_v2:301', "-whitelist=127.0.0.1", '-debug=0']  #wrong chain
+                ]
+
+    def run_test(self):
+        self.log.info("Starting nodes")
+
+        res0 = self.nodes[0].getblockchaininfo()
+        res1 = self.nodes[1].getblockchaininfo()
+
+        self.nodes[0].generate(1)
+        self.nodes[1].generate(1)
+
+        res0 = self.nodes[0].getblockchaininfo()
+        res1 = self.nodes[1].getblockchaininfo()
+
+        rightChain = res0["bestblockhash"]
+        wrongChain = res1["bestblockhash"]
+
+        assert not rightChain==wrongChain
+
+        self.log.info("Restart Node1 (after upgrade window) with forced rewindblockindex")
+        # restart node1 with right nuparams and rewindblockindex
+        # on regtest only forced rewinds possible because there are no checkpoints
+        self.restart_node(1, extra_args=['-nuparams=PoS:201', '-nuparams=PoS_v2:201', '-rewindblockindex', '-debug=0'])
+
+        res0 = self.nodes[0].getblockchaininfo()
+        res1 = self.nodes[1].getblockchaininfo()
+
+        connect_nodes(self.nodes[0], 1)
+        self.sync_blocks([self.nodes[i] for i in [0, 1]], timeout=120)
+
+        res0 = self.nodes[0].getblockchaininfo()
+        res1 = self.nodes[1].getblockchaininfo()
+
+        assert_equal(res1["bestblockhash"], rightChain)
+
+        self.log.info("Node1 on right chain")
+
+if __name__ == '__main__':
+    RewindBlockIndexCheckpointTest().main()

test/functional/test_runner.py

@@ -192,6 +192,7 @@
     # Longest test should go first, to favor running tests in parallel
     # vv Tests less than 20m vv
     'feature_dbcrash.py',
+    'feature_rewind.py',                        # ~ 353 sec
     'sapling_fillblock.py',                     # ~ 780 sec
     'feature_fee_estimation.py',                # ~ 360 sec
     # vv Tests less than 5m vv