Test gArgs erroring on unknown args

1 files changed, 11 insertions, 0 deletions

diff --git a/test/functional/feature_help.py b/test/functional/feature_help.py
index fd4a72f62..d38275a9c 100755
--- a/test/functional/feature_help.py
+++ b/test/functional/feature_help.py
@@ -36,6 +36,17 @@ class HelpTest(BitcoinTestFramework):
         output = self.nodes[0].process.stdout.read()
         assert b'version' in output
         self.log.info("Version text received: {} (...)".format(output[0:60]))
+
+        # Test that arguments not in the help results in an error
+        self.log.info("Start bitcoind with -fakearg to make sure it does not start")
+        self.nodes[0].start(extra_args=['-fakearg'], stderr=subprocess.PIPE, stdout=subprocess.PIPE)
+        # Node should exit immediately and output an error to stderr
+        ret_code = self.nodes[0].process.wait(timeout=1)
+        assert_equal(ret_code, 1)
+        output = self.nodes[0].process.stderr.read()
+        assert b'Error parsing command line arguments' in output
+        self.log.info("Error message received: {} (...)".format(output[0:60]))
+
         # Clean up TestNode state
         self.nodes[0].running = False
         self.nodes[0].process = None