Warn unrecognized sections in the config file

In the config file, sections are specified by square bracket pair "[]"$,
or included in the option name itself which separated by a period"(.)".

Typicaly, [testnet] is not a correct section name and specified options
in that section are ignored but user cannot recognize what is happen.

So, add some log/stderr-warning messages if unrecognized section names
are present in the config file after checking section only args.

1 files changed, 5 insertions, 0 deletions

diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index 88a9aadc7b..d87eabaa6d 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -34,6 +34,11 @@ class ConfArgsTest(BitcoinTestFramework):
         self.nodes[0].assert_start_raises_init_error(expected_msg='Error reading configuration file: parse error on line 3, using # in rpcpassword can be ambiguous and should be avoided')
 
         with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
+            conf.write('testnot.datadir=1\n[testnet]\n')
+        self.restart_node(0)
+        self.nodes[0].stop_node(expected_stderr='Warning: Section [testnet] is not recognized.' + os.linesep + 'Warning: Section [testnot] is not recognized.')
+
+        with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
             conf.write('')  # clear
 
     def run_test(self):