Merge bitcoin#30698: test: Add time-timewarp-attack boundary cases

31378d4 test: Add time-timewarp-attack boundary cases (Greg Sanders)

Pull request description:

  Basic addition to test case added in bitcoin#30681

ACKs for top commit:
  fjahr:
    Code review ACK 31378d4
  achow101:
    ACK 31378d4
  tdb3:
    ACK 31378d4

Tree-SHA512: 7d18af9e7fac0ecb0fb5e4c009d6ce3f9af849b4abc54ae8cf681dc8b882aaa9b4cffd7f798b7193c76d89f96ec2cb6dbd13e341882d59b0580d3573ec675ffd

test/functional/mining_basic.py

@@ -159,6 +159,15 @@ def test_timewarp(self):
         bad_block.solve()
         assert_raises_rpc_error(-25, 'time-timewarp-attack', lambda: node.submitheader(hexdata=CBlockHeader(bad_block).serialize().hex()))
 
+        self.log.info("Test timewarp protection boundary")
+        bad_block.nTime = t + MAX_FUTURE_BLOCK_TIME - MAX_TIMEWARP - 1
+        bad_block.solve()
+        assert_raises_rpc_error(-25, 'time-timewarp-attack', lambda: node.submitheader(hexdata=CBlockHeader(bad_block).serialize().hex()))
+
+        bad_block.nTime = t + MAX_FUTURE_BLOCK_TIME - MAX_TIMEWARP
+        bad_block.solve()
+        node.submitheader(hexdata=CBlockHeader(bad_block).serialize().hex())
+
     def run_test(self):
         node = self.nodes[0]
         self.wallet = MiniWallet(node)