test: add tests for -mnemonicbits

Author: UdjinM6

test/functional/test_runner.py

@@ -213,6 +213,7 @@
     'wallet_import_rescan.py',
     'wallet_import_with_label.py',
     'wallet_upgradewallet.py',
+    'wallet_mnemonicbits.py',
     'rpc_bind.py --ipv4',
     'rpc_bind.py --ipv6',
     'rpc_bind.py --nonloopback',

test/functional/wallet_mnemonicbits.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+# Copyright (c) 2023 The Dash Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test -mnemonicbits wallet option."""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+)
+
+class WalletMnemonicbitsTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 1
+        self.extra_args = [['-usehd=1']]
+
+    def skip_test_if_missing_module(self):
+        self.skip_if_no_wallet()
+
+    def run_test(self):
+        self.log.info("Test -mnemonicbits")
+
+        self.log.info("Invalid -mnemonicbits should rise an error")
+        self.stop_node(0)
+        self.nodes[0].assert_start_raises_init_error(self.extra_args[0] + ['-mnemonicbits=123'], "Error: Invalid -mnemonicbits")
+        self.start_node(0)
+        assert_equal(len(self.nodes[0].dumphdinfo()["mnemonic"].split()), 12)  # 12 words by default
+
+        self.log.info("Can have multiple wallets with different mnemonic length loaded at the same time")
+        self.restart_node(0, extra_args=self.extra_args[0] + ["-mnemonicbits=192"])
+        self.nodes[0].createwallet("wallet_192")
+        self.restart_node(0, extra_args=self.extra_args[0] + ["-mnemonicbits=256"])
+        self.nodes[0].loadwallet("wallet_192")
+        self.nodes[0].createwallet("wallet_256", False, True)  # blank
+        self.nodes[0].get_wallet_rpc("wallet_256").upgradetohd()
+        assert_equal(len(self.nodes[0].get_wallet_rpc(self.default_wallet_name).dumphdinfo()["mnemonic"].split()), 12)  # 12 words by default
+        assert_equal(len(self.nodes[0].get_wallet_rpc("wallet_192").dumphdinfo()["mnemonic"].split()), 18)              # 18 words
+        assert_equal(len(self.nodes[0].get_wallet_rpc("wallet_256").dumphdinfo()["mnemonic"].split()), 24)              # 24 words
+
+
+if __name__ == '__main__':
+    WalletMnemonicbitsTest().main ()