diff --git a/src/test/argsman_tests.cpp b/src/test/argsman_tests.cpp
index e5953cd5f55..eec8c4f9a98 100644
--- a/src/test/argsman_tests.cpp
+++ b/src/test/argsman_tests.cpp
@@ -643,10 +643,9 @@ BOOST_AUTO_TEST_CASE(util_GetArg)
 BOOST_AUTO_TEST_CASE(util_GetChainTypeString)
 {
     TestArgsManager test_args;
-    const auto testnet = std::make_pair("-testnet", ArgsManager::ALLOW_ANY);
     const auto testnet4 = std::make_pair("-testnet4", ArgsManager::ALLOW_ANY);
     const auto regtest = std::make_pair("-regtest", ArgsManager::ALLOW_ANY);
-    test_args.SetupArgs({testnet, testnet4, regtest});
+    test_args.SetupArgs({testnet4, regtest});
 
     const char* argv_testnet4[] = {"cmd", "-testnet4"};
     const char* argv_regtest[] = {"cmd", "-regtest"};
@@ -761,8 +760,8 @@ struct ArgsMergeTestingSetup : public BasicTestingSetup {
             ForEachNoDup(conf_actions, SET, SECTION_NEGATE, [&] {
                 for (bool soft_set : {false, true}) {
                     for (bool force_set : {false, true}) {
-                        for (const std::string& section : {ChainTypeToString(ChainType::MAIN), ChainTypeToString(ChainType::TESTNET), ChainTypeToString(ChainType::TESTNET4), ChainTypeToString(ChainType::SIGNET)}) {
-                            for (const std::string& network : {ChainTypeToString(ChainType::MAIN), ChainTypeToString(ChainType::TESTNET), ChainTypeToString(ChainType::TESTNET4), ChainTypeToString(ChainType::SIGNET)}) {
+                        for (const std::string& section : {ChainTypeToString(ChainType::MAIN), ChainTypeToString(ChainType::TESTNET4), ChainTypeToString(ChainType::SIGNET)}) {
+                            for (const std::string& network : {ChainTypeToString(ChainType::MAIN), ChainTypeToString(ChainType::TESTNET4), ChainTypeToString(ChainType::SIGNET)}) {
                                 for (bool net_specific : {false, true}) {
                                     fn(arg_actions, conf_actions, soft_set, force_set, section, network, net_specific);
                                 }
@@ -916,7 +915,7 @@ BOOST_FIXTURE_TEST_CASE(util_ArgsMerge, ArgsMergeTestingSetup)
     // Results file is formatted like:
     //
     //   <input> || <IsArgSet/IsArgNegated/GetArg output> | <GetArgs output> | <GetUnsuitable output>
-    BOOST_CHECK_EQUAL(out_sha_hex, "f1ee5ab094cc43d16a6086fa7f2c10389e0f99902616b31bbf29189972ad1473");
+    BOOST_CHECK_EQUAL(out_sha_hex, "4255a9ad78d2a68341750bf2de61131ef5610808b6e37b6f546222ca7342f36a");
 }
 
 // Similar test as above, but for ArgsManager::GetChainTypeString function.
diff --git a/src/test/key_io_tests.cpp b/src/test/key_io_tests.cpp
index 4dd77edc162..b28a8c9b8ab 100644
--- a/src/test/key_io_tests.cpp
+++ b/src/test/key_io_tests.cpp
@@ -137,7 +137,7 @@ BOOST_AUTO_TEST_CASE(key_io_invalid)
         std::string exp_base58string = test[0].get_str();
 
         // must be invalid as public and as private key
-        for (const auto& chain : {ChainType::MAIN, ChainType::TESTNET, ChainType::SIGNET, ChainType::REGTEST}) {
+        for (const auto& chain : {ChainType::MAIN, ChainType::SIGNET, ChainType::REGTEST}) {
             SelectParams(chain);
             destination = DecodeDestination(exp_base58string);
             BOOST_CHECK_MESSAGE(!IsValidDestination(destination), "IsValid pubkey in mainnet:" + strTest);
diff --git a/src/test/pow_tests.cpp b/src/test/pow_tests.cpp
index 76e4600441d..3f1cdfe757e 100644
--- a/src/test/pow_tests.cpp
+++ b/src/test/pow_tests.cpp
@@ -193,11 +193,6 @@ BOOST_AUTO_TEST_CASE(ChainParams_REGTEST_sanity)
     sanity_check_chainparams(*m_node.args, ChainType::REGTEST);
 }
 
-BOOST_AUTO_TEST_CASE(ChainParams_TESTNET_sanity)
-{
-    sanity_check_chainparams(*m_node.args, ChainType::TESTNET);
-}
-
 BOOST_AUTO_TEST_CASE(ChainParams_TESTNET4_sanity)
 {
     sanity_check_chainparams(*m_node.args, ChainType::TESTNET4);
diff --git a/src/test/versionbits_tests.cpp b/src/test/versionbits_tests.cpp
index 29240a45f09..1504eadb9fd 100644
--- a/src/test/versionbits_tests.cpp
+++ b/src/test/versionbits_tests.cpp
@@ -424,7 +424,7 @@ BOOST_FIXTURE_TEST_CASE(versionbits_computeblockversion, BlockVersionTest)
 
     // check that any deployment on any chain can conceivably reach both
     // ACTIVE and FAILED states in roughly the way we expect
-    for (const auto& chain_type: {ChainType::MAIN, ChainType::TESTNET, ChainType::TESTNET4, ChainType::SIGNET, ChainType::REGTEST}) {
+    for (const auto& chain_type: {ChainType::MAIN, ChainType::TESTNET4, ChainType::SIGNET, ChainType::REGTEST}) {
         const auto chainParams = CreateChainParams(*m_node.args, chain_type);
         uint32_t chain_all_vbits{0};
         for (int i = 0; i < (int)Consensus::MAX_VERSION_BITS_DEPLOYMENTS; ++i) {
diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index c5e3c33b14d..80d7d7df73c 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -465,7 +465,7 @@ class ConfArgsTest(BitcoinTestFramework):
     def test_acceptstalefeeestimates_arg_support(self):
         self.log.info("Test -acceptstalefeeestimates option support")
         conf_file = self.nodes[0].datadir_path / "bitcoin.conf"
-        for chain, chain_name in {("main", ""), ("test", "testnet3"), ("signet", "signet"), ("testnet4", "testnet4")}:
+        for chain, chain_name in {("main", ""), ("signet", "signet"), ("testnet4", "testnet4")}:
             util.write_config(conf_file, n=0, chain=chain_name, extra_config='acceptstalefeeestimates=1\n')
             self.nodes[0].assert_start_raises_init_error(expected_msg=f'Error: acceptstalefeeestimates is not supported on {chain} chain.')
         util.write_config(conf_file, n=0, chain="regtest")  # Reset to regtest
@@ -476,6 +476,11 @@ class ConfArgsTest(BitcoinTestFramework):
 
         self.log.debug("Testnet3 node will log the deprecation warning")
         self.nodes[0].chain = 'testnet3'
+        # Ensure a log file exists as TestNode.assert_debug_log() expects it.
+        self.nodes[0].debug_log_path.parent.mkdir()
+        self.nodes[0].debug_log_path.touch()
+        util.write_config(self.nodes[0].datadir_path / "bitcoin.conf", n=0, chain="testnet3")
+
         self.nodes[0].replace_in_config([('regtest=', 'testnet='), ('[regtest]', '[test]')])
         with self.nodes[0].assert_debug_log([t3_warning_log]):
             self.start_node(0)