test: replace feature_masternode_params.py with C++ unit coverage

src/Makefile.test.include

@@ -141,6 +141,7 @@ BITCOIN_TESTS =\
   test/llmq_snapshot_tests.cpp \
   test/llmq_utils_tests.cpp \
   test/logging_tests.cpp \
+  test/masternode_params_tests.cpp \
   test/dbwrapper_tests.cpp \
   test/validation_tests.cpp \
   test/mempool_tests.cpp \

src/test/masternode_params_tests.cpp

@@ -0,0 +1,60 @@
+// Copyright (c) 2025 The Dash Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <init.h>
+#include <test/util/setup_common.h>
+#include <util/system.h>
+
+#include <boost/test/unit_test.hpp>
+
+//! These tests cover the parameter interactions triggered by
+//! -masternodeblsprivkey in InitParameterInteraction. Previously this was
+//! exercised by test/functional/feature_masternode_params.py, which spun up
+//! full nodes only to read back arg state.
+BOOST_FIXTURE_TEST_SUITE(masternode_params_tests, BasicTestingSetup)
+
+//! Without -masternodeblsprivkey, masternode-driven defaults must not fire.
+BOOST_AUTO_TEST_CASE(no_masternode_key_leaves_defaults)
+{
+    ArgsManager args;
+    InitParameterInteraction(args);
+
+    BOOST_CHECK(!args.IsArgSet("-disablewallet"));
+    BOOST_CHECK(!args.IsArgSet("-peerblockfilters"));
+    BOOST_CHECK(!args.IsArgSet("-blockfilterindex"));
+}
+
+//! Setting -masternodeblsprivkey must auto-enable -disablewallet,
+//! -peerblockfilters and -blockfilterindex=basic.
+BOOST_AUTO_TEST_CASE(masternode_key_enables_filters_and_disables_wallet)
+{
+    ArgsManager args;
+    args.ForceSetArg("-masternodeblsprivkey", "dummy");
+
+    InitParameterInteraction(args);
+
+    BOOST_CHECK(args.GetBoolArg("-disablewallet", false));
+    BOOST_CHECK(args.GetBoolArg("-peerblockfilters", false));
+    BOOST_CHECK_EQUAL(args.GetArg("-blockfilterindex", ""), "basic");
+}
+
+//! Explicit user overrides must win over the masternode defaults
+//! (SoftSet semantics): the user can still disable filters and keep the
+//! wallet on a masternode.
+BOOST_AUTO_TEST_CASE(masternode_key_respects_user_overrides)
+{
+    ArgsManager args;
+    args.ForceSetArg("-masternodeblsprivkey", "dummy");
+    args.ForceSetArg("-disablewallet", "0");
+    args.ForceSetArg("-peerblockfilters", "0");
+    args.ForceSetArg("-blockfilterindex", "0");
+
+    InitParameterInteraction(args);
+
+    BOOST_CHECK(!args.GetBoolArg("-disablewallet", true));
+    BOOST_CHECK(!args.GetBoolArg("-peerblockfilters", true));
+    BOOST_CHECK_EQUAL(args.GetArg("-blockfilterindex", ""), "0");
+}
+
+BOOST_AUTO_TEST_SUITE_END()

test/functional/test_runner.py

@@ -142,7 +142,6 @@
     'feature_llmq_singlenode.py', # NOTE: needs dash_hash to pass
     'feature_dip4_coinbasemerkleroots.py', # NOTE: needs dash_hash to pass
     'feature_mnehf.py', # NOTE: needs dash_hash to pass
-    'feature_masternode_params.py', # NOTE: needs dash_hash to pass
     'feature_governance.py --legacy-wallet',
     'feature_governance.py --descriptors',
     'feature_governance_cl.py --legacy-wallet',

test/util/data/non-backported.txt

@@ -64,6 +64,7 @@ src/test/dip0020opcodes_tests.cpp
 src/test/dynamic_activation*.cpp
 src/test/evo*.cpp
 src/test/llmq*.cpp
+src/test/masternode_params_tests.cpp
 src/test/util/llmq_tests.h
 src/test/governance*.cpp
 src/unordered_lru_cache.h