test: Add test for config file parsing errors

Github-Pull: #14105
Rebased-From: ed2332a
Tree-SHA512: 17fa88a2848f1c9c9c8a127b5ea4c45761ce8e06a609dd40f8e90bb9117d88c9d2c81e752c9c0f1a44ecadbb5bedd2973bc4548da2a6d463c789797191e85ab1

Author: MarcoFalke

test/functional/feature_config_args.py

@@ -14,8 +14,29 @@ def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
 
+    def test_config_file_parser(self):
+        # Assume node is stopped
+
+        inc_conf_file_path = os.path.join(self.nodes[0].datadir, 'include.conf')
+        with open(os.path.join(self.nodes[0].datadir, 'bitcoin.conf'), 'a', encoding='utf-8') as conf:
+            conf.write('includeconf={}\n'.format(inc_conf_file_path))
+
+        with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
+            conf.write('-dash=1\n')
+        self.nodes[0].assert_start_raises_init_error(expected_msg='Error reading configuration file: parse error on line 1: -dash=1, options in configuration file must be specified without leading -')
+
+        with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
+            conf.write('nono\n')
+        self.nodes[0].assert_start_raises_init_error(expected_msg='Error reading configuration file: parse error on line 1: nono, if you intended to specify a negated option, use nono=1 instead')
+
+        with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
+            conf.write('')  # clear
+
     def run_test(self):
         self.stop_node(0)
+
+        self.test_config_file_parser()
+
         # Remove the -datadir argument so it doesn't override the config file
         self.nodes[0].args = [arg for arg in self.nodes[0].args if not arg.startswith("-datadir")]