[QA] Add RPC based rescan test

Author: jonasschnelli

test/functional/wallet-hd.py

@@ -10,6 +10,7 @@
     connect_nodes_bi,
 )
 import shutil
+import os
 
 class WalletHDTest(BitcoinTestFramework):
     def set_test_params(self):
@@ -70,9 +71,9 @@ def run_test (self):
         self.stop_node(1)
         # we need to delete the complete regtest directory
         # otherwise node1 would auto-recover all funds in flag the keypool keys as used
-        shutil.rmtree(tmpdir + "/node1/regtest/blocks")
-        shutil.rmtree(tmpdir + "/node1/regtest/chainstate")
-        shutil.copyfile(tmpdir + "/hd.bak", tmpdir + "/node1/regtest/wallet.dat")
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/blocks"))
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/chainstate"))
+        shutil.copyfile(os.path.join(tmpdir, "hd.bak"), os.path.join(tmpdir, "node1/regtest/wallet.dat"))
         self.start_node(1)
 
         # Assert that derivation is deterministic
@@ -91,6 +92,22 @@ def run_test (self):
         self.start_node(1, extra_args=self.extra_args[1] + ['-rescan'])
         assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
 
+        # Try a RPC based rescan
+        self.stop_node(1)
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/blocks"))
+        shutil.rmtree(os.path.join(tmpdir, "node1/regtest/chainstate"))
+        shutil.copyfile(os.path.join(tmpdir, "hd.bak"), os.path.join(tmpdir, "node1/regtest/wallet.dat"))
+        self.start_node(1, extra_args=self.extra_args[1])
+        connect_nodes_bi(self.nodes, 0, 1)
+        self.sync_all()
+        out = self.nodes[1].rescanblockchain(0, 1)
+        assert_equal(out['start_height'], 0)
+        assert_equal(out['stop_height'], 1)
+        out = self.nodes[1].rescanblockchain()
+        assert_equal(out['start_height'], 0)
+        assert_equal(out['stop_height'], self.nodes[1].getblockcount())
+        assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
+
         # send a tx and make sure its using the internal chain for the changeoutput
         txid = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1)
         outs = self.nodes[1].decoderawtransaction(self.nodes[1].gettransaction(txid)['hex'])['vout']