qa: sanity check mined block have their coinbase timelocked to height

Author: darosior

test/functional/mining_basic.py

@@ -28,9 +28,10 @@
     COIN,
     DEFAULT_BLOCK_RESERVED_WEIGHT,
     MAX_BLOCK_WEIGHT,
+    MAX_SEQUENCE_NONFINAL,
     MINIMUM_BLOCK_RESERVED_WEIGHT,
     ser_uint256,
-    WITNESS_SCALE_FACTOR
+    WITNESS_SCALE_FACTOR,
 )
 from test_framework.p2p import P2PDataStore
 from test_framework.test_framework import BitcoinTestFramework
@@ -318,6 +319,12 @@ def test_block_max_weight(self):
             expected_msg=f"Error: Specified -blockmaxweight ({MAX_BLOCK_WEIGHT + 1}) exceeds consensus maximum block weight ({MAX_BLOCK_WEIGHT})",
         )
 
+    def test_height_in_locktime(self):
+        self.log.info("Sanity check generated blocks have their coinbase timelocked to their height.")
+        self.generate(self.nodes[0], 1, sync_fun=self.no_op)
+        block = self.nodes[0].getblock(self.nodes[0].getbestblockhash(), 2)
+        assert_equal(block["tx"][0]["locktime"], block["height"] - 1)
+        assert_equal(block["tx"][0]["vin"][0]["sequence"], MAX_SEQUENCE_NONFINAL)
 
     def run_test(self):
         node = self.nodes[0]
@@ -547,6 +554,7 @@ def chain_tip(b_hash, *, status='headers-only', branchlen=1):
         self.test_block_max_weight()
         self.test_timewarp()
         self.test_pruning()
+        self.test_height_in_locktime()
 
 
 if __name__ == '__main__':