1 files changed, 62 insertions, 0 deletions
diff --git a/test/functional/feature_help.py b/test/functional/feature_help.py
new file mode 100755
index 0000000000..ed1d25c0d6
--- /dev/null
+++ b/test/functional/feature_help.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Verify that starting bitcoin with -h works as expected."""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
+
+class HelpTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 1
+
+    def setup_network(self):
+        self.add_nodes(self.num_nodes)
+        # Don't start the node
+
+    def get_node_output(self, *, ret_code_expected):
+        ret_code = self.nodes[0].process.wait(timeout=5)
+        assert_equal(ret_code, ret_code_expected)
+        self.nodes[0].stdout.seek(0)
+        self.nodes[0].stderr.seek(0)
+        out = self.nodes[0].stdout.read()
+        err = self.nodes[0].stderr.read()
+        self.nodes[0].stdout.close()
+        self.nodes[0].stderr.close()
+
+        # Clean up TestNode state
+        self.nodes[0].running = False
+        self.nodes[0].process = None
+        self.nodes[0].rpc_connected = False
+        self.nodes[0].rpc = None
+
+        return out, err
+
+    def run_test(self):
+        self.log.info("Start bitcoin with -h for help text")
+        self.nodes[0].start(extra_args=['-h'])
+        # Node should exit immediately and output help to stdout.
+        output, _ = self.get_node_output(ret_code_expected=0)
+        assert b'Options' in output
+        self.log.info("Help text received: {} (...)".format(output[0:60]))
+
+        self.log.info("Start bitcoin with -version for version information")
+        self.nodes[0].start(extra_args=['-version'])
+        # Node should exit immediately and output version to stdout.
+        output, _ = self.get_node_output(ret_code_expected=0)
+        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'])
+        # Node should exit immediately and output an error to stderr
+        _, output = self.get_node_output(ret_code_expected=1)
+        assert b'Error parsing command line arguments' in output
+        self.log.info("Error message received: {} (...)".format(output[0:60]))
+
+
+if __name__ == '__main__':
+    HelpTest().main()