old_contents: #!/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."""
  import subprocess
  
  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 run_test(self):
          self.log.info("Start bitcoin with -h for help text")
          self.nodes[0].start(extra_args=['-h'], stderr=subprocess.PIPE, stdout=subprocess.PIPE)
          # Node should exit immediately and output help to stdout.
          ret_code = self.nodes[0].process.wait(timeout=1)
          assert_equal(ret_code, 0)
          output = self.nodes[0].process.stdout.read()
          assert b'Options' in output
          self.log.info("Help text received: {} (...)".format(output[0:60]))
          self.nodes[0].running = False
  
          self.log.info("Start bitcoin with -version for version information")
          self.nodes[0].start(extra_args=['-version'], stderr=subprocess.PIPE, stdout=subprocess.PIPE)
          # Node should exit immediately and output version to stdout.
          ret_code = self.nodes[0].process.wait(timeout=1)
          assert_equal(ret_code, 0)
          output = self.nodes[0].process.stdout.read()
          assert b'version' in output
          self.log.info("Version text received: {} (...)".format(output[0:60]))
          self.nodes[0].running = False
  
  if __name__ == '__main__':
      HelpTest().main()
  
new_contents: #!/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."""
  import subprocess
  
  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 run_test(self):
          self.log.info("Start bitcoin with -h for help text")
          self.nodes[0].start(extra_args=['-h'], stderr=subprocess.PIPE, stdout=subprocess.PIPE)
          # Node should exit immediately and output help to stdout.
          ret_code = self.nodes[0].process.wait(timeout=1)
          assert_equal(ret_code, 0)
          output = self.nodes[0].process.stdout.read()
          assert b'Options' in output
          self.log.info("Help text received: {} (...)".format(output[0:60]))
          self.nodes[0].running = False
  
          self.log.info("Start bitcoin with -version for version information")
          self.nodes[0].start(extra_args=['-version'], stderr=subprocess.PIPE, stdout=subprocess.PIPE)
          # Node should exit immediately and output version to stdout.
          ret_code = self.nodes[0].process.wait(timeout=1)
          assert_equal(ret_code, 0)
          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]))
  
          self.nodes[0].running = False
  
  if __name__ == '__main__':
      HelpTest().main()
  
subject: Test gArgs erroring on unknown args